/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-19 23:18:37,444 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 23:18:37,445 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 23:18:37,480 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 23:18:37,518 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-03-19 23:18:37,540 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 23:18:37,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 23:18:37,540 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-19 23:18:37,541 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-19 23:18:37,542 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-19 23:18:37,542 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-19 23:18:37,543 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-19 23:18:37,543 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-19 23:18:37,543 INFO L138 SettingsManager]: * Use SBE=true [2022-03-19 23:18:37,543 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 23:18:37,544 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 23:18:37,545 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 23:18:37,545 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 23:18:37,546 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 23:18:37,546 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 23:18:37,729 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 23:18:37,746 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 23:18:37,747 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 23:18:37,748 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 23:18:37,748 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 23:18:37,749 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c [2022-03-19 23:18:37,792 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5605b117/4ab32c1eae2848c68ff3ab5a6088ae4f/FLAG98a779b41 [2022-03-19 23:18:38,163 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 23:18:38,164 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c [2022-03-19 23:18:38,168 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5605b117/4ab32c1eae2848c68ff3ab5a6088ae4f/FLAG98a779b41 [2022-03-19 23:18:38,176 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5605b117/4ab32c1eae2848c68ff3ab5a6088ae4f [2022-03-19 23:18:38,178 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 23:18:38,179 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 23:18:38,181 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 23:18:38,181 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 23:18:38,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 23:18:38,186 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,187 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a4165a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38, skipping insertion in model container [2022-03-19 23:18:38,187 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,191 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 23:18:38,203 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 23:18:38,356 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/sumt8.c[403,416] [2022-03-19 23:18:38,383 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 23:18:38,388 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 23:18:38,397 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/sumt8.c[403,416] [2022-03-19 23:18:38,409 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 23:18:38,420 INFO L208 MainTranslator]: Completed translation [2022-03-19 23:18:38,421 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38 WrapperNode [2022-03-19 23:18:38,421 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 23:18:38,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 23:18:38,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 23:18:38,422 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 23:18:38,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,429 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,443 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,443 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,447 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,449 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,450 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,451 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 23:18:38,451 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 23:18:38,452 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 23:18:38,452 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 23:18:38,457 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (1/1) ... [2022-03-19 23:18:38,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 23:18:38,468 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:18:38,504 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) [2022-03-19 23:18:38,519 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 [2022-03-19 23:18:38,540 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 23:18:38,541 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 23:18:38,541 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 23:18:38,541 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-19 23:18:38,542 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 23:18:38,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 23:18:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 23:18:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 23:18:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 23:18:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 23:18:38,542 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 23:18:38,543 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 23:18:38,590 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 23:18:38,591 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 23:18:47,471 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 23:18:47,475 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 23:18:47,475 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-19 23:18:47,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 11:18:47 BoogieIcfgContainer [2022-03-19 23:18:47,476 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 23:18:47,477 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 23:18:47,477 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 23:18:47,484 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 23:18:47,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 11:18:38" (1/3) ... [2022-03-19 23:18:47,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@467e3f1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 11:18:47, skipping insertion in model container [2022-03-19 23:18:47,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 11:18:38" (2/3) ... [2022-03-19 23:18:47,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@467e3f1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 11:18:47, skipping insertion in model container [2022-03-19 23:18:47,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 11:18:47" (3/3) ... [2022-03-19 23:18:47,486 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt8.c [2022-03-19 23:18:47,489 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-19 23:18:47,489 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 23:18:47,521 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 23:18:47,525 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-19 23:18:47,525 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 23:18:47,535 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 22 states have internal predecessors, (32), 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) [2022-03-19 23:18:47,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-19 23:18:47,551 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:18:47,551 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:18:47,552 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:18:47,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:18:47,555 INFO L85 PathProgramCache]: Analyzing trace with hash 1128394070, now seen corresponding path program 1 times [2022-03-19 23:18:47,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:18:47,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554853501] [2022-03-19 23:18:47,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:18:47,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:18:47,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:18:48,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:18:48,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:18:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:18:48,100 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:18:48,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554853501] [2022-03-19 23:18:48,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554853501] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 23:18:48,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 23:18:48,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 23:18:48,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993917350] [2022-03-19 23:18:48,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:18:48,105 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 23:18:48,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:18:48,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 23:18:48,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-19 23:18:48,123 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 22 states have internal predecessors, (32), 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 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 23:18:50,335 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:18:52,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:18:54,624 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:18:56,784 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:18:58,948 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:01,108 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:03,309 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:05,470 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:07,616 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:09,777 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:10,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:19:10,008 INFO L93 Difference]: Finished difference Result 66 states and 95 transitions. [2022-03-19 23:19:10,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 23:19:10,011 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-19 23:19:10,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:19:10,019 INFO L225 Difference]: With dead ends: 66 [2022-03-19 23:19:10,019 INFO L226 Difference]: Without dead ends: 34 [2022-03-19 23:19:10,021 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:19:10,023 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 57 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 14 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.7s IncrementalHoareTripleChecker+Time [2022-03-19 23:19:10,024 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 55 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 123 Invalid, 10 Unknown, 0 Unchecked, 21.7s Time] [2022-03-19 23:19:10,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-19 23:19:10,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2022-03-19 23:19:10,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 24 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 23:19:10,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2022-03-19 23:19:10,053 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 14 [2022-03-19 23:19:10,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:19:10,053 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2022-03-19 23:19:10,053 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 23:19:10,054 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2022-03-19 23:19:10,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 23:19:10,054 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:19:10,054 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:19:10,054 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 23:19:10,055 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:19:10,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:19:10,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1294727378, now seen corresponding path program 1 times [2022-03-19 23:19:10,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:19:10,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635055399] [2022-03-19 23:19:10,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:10,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:19:10,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:10,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:19:10,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:10,132 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:19:10,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:10,138 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:10,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:19:10,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635055399] [2022-03-19 23:19:10,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635055399] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:10,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714530915] [2022-03-19 23:19:10,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:10,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:19:10,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:19:10,141 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) [2022-03-19 23:19:10,162 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 23:19:10,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:10,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:19:10,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:19:10,611 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:10,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:19:10,778 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:19:10,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714530915] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:10,778 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:19:10,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:19:10,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206708656] [2022-03-19 23:19:10,779 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:19:10,780 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:19:10,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:19:10,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:19:10,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:19:10,780 INFO L87 Difference]: Start difference. First operand 31 states and 38 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:19:12,849 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:15,024 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:17,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:19,314 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:21,492 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:23,619 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:25,797 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:27,972 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.18s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:28,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:19:28,158 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-19 23:19:28,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:19:28,159 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-03-19 23:19:28,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:19:28,161 INFO L225 Difference]: With dead ends: 42 [2022-03-19 23:19:28,161 INFO L226 Difference]: Without dead ends: 40 [2022-03-19 23:19:28,161 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:19:28,162 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-19 23:19:28,162 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 86 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 7 Unknown, 0 Unchecked, 17.3s Time] [2022-03-19 23:19:28,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-19 23:19:28,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-03-19 23:19:28,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 23:19:28,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2022-03-19 23:19:28,178 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2022-03-19 23:19:28,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:19:28,178 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2022-03-19 23:19:28,178 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:19:28,178 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2022-03-19 23:19:28,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 23:19:28,179 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:19:28,179 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:19:28,205 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 23:19:28,403 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:19:28,406 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:19:28,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:19:28,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1889278409, now seen corresponding path program 1 times [2022-03-19 23:19:28,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:19:28,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512573616] [2022-03-19 23:19:28,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:28,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:19:28,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:28,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:19:28,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:28,555 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:19:28,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:28,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:28,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:19:28,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512573616] [2022-03-19 23:19:28,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512573616] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:28,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733089147] [2022-03-19 23:19:28,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:28,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:19:28,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:19:28,580 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) [2022-03-19 23:19:28,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 23:19:28,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:28,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:19:28,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:19:29,037 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:29,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:19:29,173 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:19:29,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733089147] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:29,174 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:19:29,174 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:19:29,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483975027] [2022-03-19 23:19:29,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:19:29,174 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:19:29,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:19:29,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:19:29,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:19:29,175 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:19:31,211 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:33,384 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:35,549 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:37,706 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:39,817 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:41,948 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:44,114 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:46,297 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:49,220 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.92s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:51,393 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:51,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:19:51,394 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2022-03-19 23:19:51,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:19:51,511 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-03-19 23:19:51,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:19:51,512 INFO L225 Difference]: With dead ends: 44 [2022-03-19 23:19:51,512 INFO L226 Difference]: Without dead ends: 42 [2022-03-19 23:19:51,512 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:19:51,513 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 22.2s IncrementalHoareTripleChecker+Time [2022-03-19 23:19:51,513 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 52 Invalid, 10 Unknown, 0 Unchecked, 22.2s Time] [2022-03-19 23:19:51,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-19 23:19:51,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2022-03-19 23:19:51,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 26 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 23:19:51,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2022-03-19 23:19:51,532 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 23 [2022-03-19 23:19:51,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:19:51,532 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2022-03-19 23:19:51,533 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:19:51,533 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2022-03-19 23:19:51,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 23:19:51,533 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:19:51,533 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:19:51,552 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-19 23:19:51,733 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,SelfDestructingSolverStorable2 [2022-03-19 23:19:51,734 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:19:51,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:19:51,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1666064243, now seen corresponding path program 1 times [2022-03-19 23:19:51,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:19:51,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594209924] [2022-03-19 23:19:51,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:51,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:19:51,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:51,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:19:51,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:51,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:19:51,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:51,819 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:51,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:19:51,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594209924] [2022-03-19 23:19:51,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594209924] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:51,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88605921] [2022-03-19 23:19:51,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:19:51,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:19:51,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:19:51,824 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) [2022-03-19 23:19:51,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 23:19:51,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:19:51,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:19:51,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:19:52,261 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:19:52,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:19:52,412 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:19:52,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88605921] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:19:52,412 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:19:52,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:19:52,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349519741] [2022-03-19 23:19:52,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:19:52,413 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:19:52,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:19:52,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:19:52,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:19:52,413 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:19:54,451 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:56,619 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:19:58,731 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:00,845 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:02,961 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:05,080 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:07,251 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:09,428 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:11,594 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:11,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:20:11,777 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2022-03-19 23:20:11,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:20:11,778 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2022-03-19 23:20:11,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:20:11,779 INFO L225 Difference]: With dead ends: 55 [2022-03-19 23:20:11,779 INFO L226 Difference]: Without dead ends: 53 [2022-03-19 23:20:11,779 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:20:11,780 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2022-03-19 23:20:11,780 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 82 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 9 Unknown, 0 Unchecked, 19.3s Time] [2022-03-19 23:20:11,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-19 23:20:11,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-19 23:20:11,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-19 23:20:11,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 67 transitions. [2022-03-19 23:20:11,787 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 67 transitions. Word has length 24 [2022-03-19 23:20:11,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:20:11,788 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 67 transitions. [2022-03-19 23:20:11,788 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:20:11,788 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 67 transitions. [2022-03-19 23:20:11,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 23:20:11,788 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:20:11,789 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:20:11,805 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 23:20:12,003 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:12,003 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:20:12,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:20:12,004 INFO L85 PathProgramCache]: Analyzing trace with hash 1101753362, now seen corresponding path program 1 times [2022-03-19 23:20:12,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:20:12,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564891944] [2022-03-19 23:20:12,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:12,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:20:12,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:12,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:20:12,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:12,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:20:12,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:12,146 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:12,146 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:20:12,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564891944] [2022-03-19 23:20:12,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564891944] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:20:12,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910564256] [2022-03-19 23:20:12,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:12,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:12,147 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:20:12,164 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) [2022-03-19 23:20:12,165 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 23:20:12,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:12,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:20:12,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:20:12,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:12,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:20:12,743 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:20:12,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910564256] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:20:12,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:20:12,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:20:12,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495608288] [2022-03-19 23:20:12,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:20:12,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:20:12,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:20:12,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:20:12,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:20:12,745 INFO L87 Difference]: Start difference. First operand 53 states and 67 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:20:14,778 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:16,947 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:19,063 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:21,185 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:23,336 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:25,457 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:27,572 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:29,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:31,937 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:32,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:20:32,134 INFO L93 Difference]: Finished difference Result 67 states and 86 transitions. [2022-03-19 23:20:32,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:20:32,135 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-03-19 23:20:32,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:20:32,136 INFO L225 Difference]: With dead ends: 67 [2022-03-19 23:20:32,136 INFO L226 Difference]: Without dead ends: 65 [2022-03-19 23:20:32,136 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:20:32,136 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-19 23:20:32,137 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-19 23:20:32,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-19 23:20:32,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-19 23:20:32,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 51 states have (on average 1.392156862745098) internal successors, (71), 51 states have internal predecessors, (71), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-19 23:20:32,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2022-03-19 23:20:32,156 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 25 [2022-03-19 23:20:32,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:20:32,156 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2022-03-19 23:20:32,156 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:20:32,156 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2022-03-19 23:20:32,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-19 23:20:32,157 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:20:32,157 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:20:32,174 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 23:20:32,363 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:32,364 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:20:32,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:20:32,364 INFO L85 PathProgramCache]: Analyzing trace with hash 1147898952, now seen corresponding path program 1 times [2022-03-19 23:20:32,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:20:32,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917940152] [2022-03-19 23:20:32,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:32,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:20:32,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:32,423 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:20:32,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:32,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:20:32,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:32,432 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:32,432 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:20:32,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917940152] [2022-03-19 23:20:32,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917940152] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:20:32,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547376669] [2022-03-19 23:20:32,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:32,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:32,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:20:32,447 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) [2022-03-19 23:20:32,448 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 23:20:32,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:32,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:20:32,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:20:32,956 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:32,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:20:33,133 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:20:33,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547376669] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:20:33,133 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:20:33,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:20:33,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064951509] [2022-03-19 23:20:33,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:20:33,134 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:20:33,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:20:33,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:20:33,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:20:33,134 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:20:35,173 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:37,346 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:39,472 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:41,590 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:43,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:45,883 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:47,991 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:50,112 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:52,236 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:54,415 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:56,549 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:58,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:20:58,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:20:58,865 INFO L93 Difference]: Finished difference Result 81 states and 107 transitions. [2022-03-19 23:20:58,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:20:58,866 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2022-03-19 23:20:58,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:20:58,866 INFO L225 Difference]: With dead ends: 81 [2022-03-19 23:20:58,866 INFO L226 Difference]: Without dead ends: 79 [2022-03-19 23:20:58,867 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:20:58,867 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2022-03-19 23:20:58,867 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 12 Unknown, 0 Unchecked, 25.7s Time] [2022-03-19 23:20:58,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-19 23:20:58,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2022-03-19 23:20:58,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 62 states have internal predecessors, (88), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-19 23:20:58,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 103 transitions. [2022-03-19 23:20:58,880 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 103 transitions. Word has length 26 [2022-03-19 23:20:58,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:20:58,880 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 103 transitions. [2022-03-19 23:20:58,880 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:20:58,880 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 103 transitions. [2022-03-19 23:20:58,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 23:20:58,885 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:20:58,885 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:20:58,902 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-19 23:20:59,086 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:59,086 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:20:59,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:20:59,089 INFO L85 PathProgramCache]: Analyzing trace with hash -1573409299, now seen corresponding path program 1 times [2022-03-19 23:20:59,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:20:59,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714422800] [2022-03-19 23:20:59,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:59,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:20:59,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:59,255 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:20:59,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:59,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:20:59,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:59,285 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:59,286 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:20:59,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714422800] [2022-03-19 23:20:59,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714422800] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:20:59,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226547922] [2022-03-19 23:20:59,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:20:59,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:20:59,286 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:20:59,287 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) [2022-03-19 23:20:59,288 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 23:20:59,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:20:59,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:20:59,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:20:59,865 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:20:59,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:21:00,121 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:00,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226547922] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:00,122 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:21:00,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-03-19 23:21:00,122 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897126678] [2022-03-19 23:21:00,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:21:00,122 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:21:00,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:21:00,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:21:00,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2022-03-19 23:21:00,123 INFO L87 Difference]: Start difference. First operand 78 states and 103 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:02,172 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:04,347 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.18s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:06,468 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:08,585 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:10,764 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:12,885 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:15,099 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:17,221 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:17,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:21:17,444 INFO L93 Difference]: Finished difference Result 93 states and 124 transitions. [2022-03-19 23:21:17,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:21:17,444 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 27 [2022-03-19 23:21:17,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:21:17,445 INFO L225 Difference]: With dead ends: 93 [2022-03-19 23:21:17,445 INFO L226 Difference]: Without dead ends: 91 [2022-03-19 23:21:17,446 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=295, Unknown=0, NotChecked=0, Total=342 [2022-03-19 23:21:17,447 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-19 23:21:17,447 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-19 23:21:17,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-19 23:21:17,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2022-03-19 23:21:17,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 63 states have internal predecessors, (90), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-19 23:21:17,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 105 transitions. [2022-03-19 23:21:17,454 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 105 transitions. Word has length 27 [2022-03-19 23:21:17,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:21:17,455 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 105 transitions. [2022-03-19 23:21:17,455 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:17,455 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 105 transitions. [2022-03-19 23:21:17,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 23:21:17,455 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:21:17,455 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:21:17,478 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 23:21:17,656 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:21:17,656 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:21:17,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:21:17,657 INFO L85 PathProgramCache]: Analyzing trace with hash 108526595, now seen corresponding path program 1 times [2022-03-19 23:21:17,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:21:17,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004791268] [2022-03-19 23:21:17,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:17,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:21:17,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:17,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:21:17,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:17,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:21:17,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:17,712 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:21:17,712 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:21:17,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004791268] [2022-03-19 23:21:17,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004791268] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:17,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983016533] [2022-03-19 23:21:17,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:17,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:21:17,712 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:21:17,713 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) [2022-03-19 23:21:17,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 23:21:17,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:17,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 23:21:17,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:21:18,263 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 23:21:18,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:21:18,432 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:18,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983016533] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:18,432 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:21:18,432 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-19 23:21:18,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147111751] [2022-03-19 23:21:18,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:21:18,433 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:21:18,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:21:18,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:21:18,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-19 23:21:18,433 INFO L87 Difference]: Start difference. First operand 79 states and 105 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:20,458 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:22,636 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:24,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:26,877 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:29,056 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:31,176 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:33,391 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:35,521 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:37,738 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:37,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:21:37,868 INFO L93 Difference]: Finished difference Result 108 states and 147 transitions. [2022-03-19 23:21:37,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:21:37,868 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-03-19 23:21:37,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:21:37,869 INFO L225 Difference]: With dead ends: 108 [2022-03-19 23:21:37,869 INFO L226 Difference]: Without dead ends: 106 [2022-03-19 23:21:37,870 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-19 23:21:37,870 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-19 23:21:37,870 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-19 23:21:37,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-19 23:21:37,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-03-19 23:21:37,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 86 states have (on average 1.4651162790697674) internal successors, (126), 86 states have internal predecessors, (126), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-19 23:21:37,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2022-03-19 23:21:37,889 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 28 [2022-03-19 23:21:37,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:21:37,890 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2022-03-19 23:21:37,890 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:37,890 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2022-03-19 23:21:37,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 23:21:37,894 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:21:37,894 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:21:37,913 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 23:21:38,110 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:21:38,111 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:21:38,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:21:38,111 INFO L85 PathProgramCache]: Analyzing trace with hash -1795383072, now seen corresponding path program 1 times [2022-03-19 23:21:38,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:21:38,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007813160] [2022-03-19 23:21:38,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:38,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:21:38,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:38,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:21:38,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:38,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:21:38,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:38,311 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:21:38,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:38,315 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:38,315 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:21:38,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007813160] [2022-03-19 23:21:38,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007813160] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:38,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853414969] [2022-03-19 23:21:38,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:38,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:21:38,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:21:38,332 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) [2022-03-19 23:21:38,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 23:21:38,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:38,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:21:38,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:21:38,961 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:38,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:21:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 23:21:39,200 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853414969] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:39,200 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:21:39,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-19 23:21:39,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777043820] [2022-03-19 23:21:39,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:21:39,201 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:21:39,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:21:39,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:21:39,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:21:39,201 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:41,241 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:43,422 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:45,621 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:47,815 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.19s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:50,004 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:52,128 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:54,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:54,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:21:54,507 INFO L93 Difference]: Finished difference Result 118 states and 160 transitions. [2022-03-19 23:21:54,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:21:54,507 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2022-03-19 23:21:54,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:21:54,508 INFO L225 Difference]: With dead ends: 118 [2022-03-19 23:21:54,508 INFO L226 Difference]: Without dead ends: 116 [2022-03-19 23:21:54,508 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-19 23:21:54,509 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.3s IncrementalHoareTripleChecker+Time [2022-03-19 23:21:54,509 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 57 Invalid, 7 Unknown, 0 Unchecked, 15.3s Time] [2022-03-19 23:21:54,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-03-19 23:21:54,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 97. [2022-03-19 23:21:54,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 79 states have (on average 1.481012658227848) internal successors, (117), 79 states have internal predecessors, (117), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-19 23:21:54,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 134 transitions. [2022-03-19 23:21:54,517 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 134 transitions. Word has length 33 [2022-03-19 23:21:54,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:21:54,517 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 134 transitions. [2022-03-19 23:21:54,517 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:54,517 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 134 transitions. [2022-03-19 23:21:54,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 23:21:54,518 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:21:54,518 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:21:54,535 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 23:21:54,735 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-19 23:21:54,735 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:21:54,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:21:54,735 INFO L85 PathProgramCache]: Analyzing trace with hash 1119304443, now seen corresponding path program 1 times [2022-03-19 23:21:54,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:21:54,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051788033] [2022-03-19 23:21:54,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:54,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:21:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:54,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:21:54,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:54,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:21:54,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:54,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-19 23:21:54,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:54,926 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:54,926 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:21:54,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051788033] [2022-03-19 23:21:54,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051788033] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:54,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [482678891] [2022-03-19 23:21:54,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:21:54,926 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:21:54,927 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:21:54,928 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) [2022-03-19 23:21:54,928 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 23:21:54,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:21:54,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:21:54,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:21:55,520 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:21:55,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:21:55,777 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 23:21:55,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [482678891] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:21:55,777 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:21:55,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-19 23:21:55,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584266379] [2022-03-19 23:21:55,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:21:55,779 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:21:55,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:21:55,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:21:55,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2022-03-19 23:21:55,780 INFO L87 Difference]: Start difference. First operand 97 states and 134 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:21:57,817 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:21:59,994 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:02,107 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:04,282 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:06,485 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:08,659 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:08,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:22:08,834 INFO L93 Difference]: Finished difference Result 120 states and 164 transitions. [2022-03-19 23:22:08,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:22:08,835 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-03-19 23:22:08,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:22:08,835 INFO L225 Difference]: With dead ends: 120 [2022-03-19 23:22:08,836 INFO L226 Difference]: Without dead ends: 118 [2022-03-19 23:22:08,836 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2022-03-19 23:22:08,836 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-03-19 23:22:08,837 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 6 Unknown, 0 Unchecked, 13.0s Time] [2022-03-19 23:22:08,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-03-19 23:22:08,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 107. [2022-03-19 23:22:08,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.471264367816092) internal successors, (128), 87 states have internal predecessors, (128), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-19 23:22:08,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 147 transitions. [2022-03-19 23:22:08,847 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 147 transitions. Word has length 34 [2022-03-19 23:22:08,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:22:08,848 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 147 transitions. [2022-03-19 23:22:08,848 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:08,848 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 147 transitions. [2022-03-19 23:22:08,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 23:22:08,848 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:22:08,848 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:22:08,866 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 23:22:09,054 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-19 23:22:09,054 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:22:09,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:22:09,055 INFO L85 PathProgramCache]: Analyzing trace with hash 1140859003, now seen corresponding path program 1 times [2022-03-19 23:22:09,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:22:09,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625526907] [2022-03-19 23:22:09,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:09,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:22:09,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:09,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:22:09,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:09,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:22:09,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:09,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:22:09,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:09,187 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:22:09,187 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:22:09,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625526907] [2022-03-19 23:22:09,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625526907] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:09,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938869468] [2022-03-19 23:22:09,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:09,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:22:09,188 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:22:09,189 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) [2022-03-19 23:22:09,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 23:22:09,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:09,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:22:09,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:22:09,704 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:22:09,704 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:22:09,939 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 23:22:09,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938869468] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:09,940 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:22:09,940 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-19 23:22:09,940 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533993828] [2022-03-19 23:22:09,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:22:09,941 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:22:09,941 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:22:09,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:22:09,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:22:09,941 INFO L87 Difference]: Start difference. First operand 107 states and 147 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:11,978 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:14,151 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:16,268 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:18,397 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:20,526 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:22,662 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:24,841 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:27,030 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:29,166 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:29,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:22:29,366 INFO L93 Difference]: Finished difference Result 141 states and 192 transitions. [2022-03-19 23:22:29,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:22:29,372 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-03-19 23:22:29,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:22:29,373 INFO L225 Difference]: With dead ends: 141 [2022-03-19 23:22:29,373 INFO L226 Difference]: Without dead ends: 139 [2022-03-19 23:22:29,373 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-19 23:22:29,373 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-19 23:22:29,373 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 76 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-19 23:22:29,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-03-19 23:22:29,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-03-19 23:22:29,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 113 states have (on average 1.4601769911504425) internal successors, (165), 113 states have internal predecessors, (165), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-19 23:22:29,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 190 transitions. [2022-03-19 23:22:29,384 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 190 transitions. Word has length 35 [2022-03-19 23:22:29,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:22:29,384 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 190 transitions. [2022-03-19 23:22:29,384 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:29,384 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 190 transitions. [2022-03-19 23:22:29,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 23:22:29,385 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:22:29,385 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:22:29,410 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 23:22:29,610 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,SelfDestructingSolverStorable10 [2022-03-19 23:22:29,611 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:22:29,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:22:29,611 INFO L85 PathProgramCache]: Analyzing trace with hash 228128645, now seen corresponding path program 1 times [2022-03-19 23:22:29,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:22:29,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223612500] [2022-03-19 23:22:29,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:29,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:22:29,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:29,657 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:22:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:29,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:22:29,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:29,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2022-03-19 23:22:29,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:29,669 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:22:29,669 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:22:29,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223612500] [2022-03-19 23:22:29,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223612500] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:29,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353182109] [2022-03-19 23:22:29,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:29,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:22:29,669 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:22:29,670 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) [2022-03-19 23:22:29,671 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 23:22:29,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:29,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:22:29,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:22:30,206 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:22:30,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:22:30,431 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 23:22:30,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353182109] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:30,431 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:22:30,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-19 23:22:30,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184359036] [2022-03-19 23:22:30,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:22:30,432 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:22:30,432 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:22:30,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:22:30,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-19 23:22:30,432 INFO L87 Difference]: Start difference. First operand 139 states and 190 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:32,463 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:34,639 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:36,756 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:38,929 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:41,045 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:43,226 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:45,342 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:47,528 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:47,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:22:47,647 INFO L93 Difference]: Finished difference Result 155 states and 213 transitions. [2022-03-19 23:22:47,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:22:47,647 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-03-19 23:22:47,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:22:47,648 INFO L225 Difference]: With dead ends: 155 [2022-03-19 23:22:47,648 INFO L226 Difference]: Without dead ends: 153 [2022-03-19 23:22:47,648 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:22:47,649 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-19 23:22:47,649 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-19 23:22:47,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-03-19 23:22:47,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2022-03-19 23:22:47,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 124 states have (on average 1.467741935483871) internal successors, (182), 124 states have internal predecessors, (182), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-19 23:22:47,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 209 transitions. [2022-03-19 23:22:47,658 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 209 transitions. Word has length 35 [2022-03-19 23:22:47,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:22:47,658 INFO L478 AbstractCegarLoop]: Abstraction has 152 states and 209 transitions. [2022-03-19 23:22:47,658 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:47,658 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 209 transitions. [2022-03-19 23:22:47,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 23:22:47,660 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:22:47,660 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:22:47,692 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-19 23:22:47,860 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,SelfDestructingSolverStorable11 [2022-03-19 23:22:47,861 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:22:47,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:22:47,861 INFO L85 PathProgramCache]: Analyzing trace with hash -1934793473, now seen corresponding path program 1 times [2022-03-19 23:22:47,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:22:47,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524423534] [2022-03-19 23:22:47,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:47,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:22:47,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:47,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:22:47,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:47,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:22:47,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:47,937 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:22:47,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:47,940 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:22:47,940 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:22:47,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524423534] [2022-03-19 23:22:47,941 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [524423534] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:47,941 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816416133] [2022-03-19 23:22:47,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:22:47,941 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:22:47,941 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:22:47,942 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) [2022-03-19 23:22:47,946 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 23:22:47,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:22:47,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:22:47,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:22:48,572 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:22:48,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:22:48,760 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 23:22:48,760 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816416133] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:22:48,760 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:22:48,760 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-19 23:22:48,760 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564807410] [2022-03-19 23:22:48,760 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:22:48,760 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:22:48,760 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:22:48,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:22:48,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:22:48,761 INFO L87 Difference]: Start difference. First operand 152 states and 209 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:22:50,808 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:52,986 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:55,106 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:57,220 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:22:59,397 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:01,578 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:03,691 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:03,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:23:03,878 INFO L93 Difference]: Finished difference Result 167 states and 230 transitions. [2022-03-19 23:23:03,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:23:03,878 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2022-03-19 23:23:03,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:23:03,879 INFO L225 Difference]: With dead ends: 167 [2022-03-19 23:23:03,879 INFO L226 Difference]: Without dead ends: 165 [2022-03-19 23:23:03,879 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 64 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-19 23:23:03,880 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 1 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2022-03-19 23:23:03,880 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 63 Invalid, 7 Unknown, 0 Unchecked, 15.1s Time] [2022-03-19 23:23:03,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-03-19 23:23:03,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 153. [2022-03-19 23:23:03,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 125 states have (on average 1.472) internal successors, (184), 125 states have internal predecessors, (184), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-19 23:23:03,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 211 transitions. [2022-03-19 23:23:03,890 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 211 transitions. Word has length 36 [2022-03-19 23:23:03,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:23:03,890 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 211 transitions. [2022-03-19 23:23:03,890 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:03,890 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 211 transitions. [2022-03-19 23:23:03,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 23:23:03,891 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:23:03,891 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:23:03,909 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-19 23:23:04,112 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,SelfDestructingSolverStorable12 [2022-03-19 23:23:04,113 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:23:04,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:23:04,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1614274432, now seen corresponding path program 1 times [2022-03-19 23:23:04,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:23:04,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744768600] [2022-03-19 23:23:04,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:04,113 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:23:04,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:04,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:23:04,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:04,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:23:04,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:04,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-19 23:23:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:04,305 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:23:04,305 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:23:04,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744768600] [2022-03-19 23:23:04,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744768600] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:04,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1677125344] [2022-03-19 23:23:04,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:04,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:23:04,305 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:23:04,306 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 23:23:04,307 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 23:23:04,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:04,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:23:04,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:23:04,811 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:23:04,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:23:05,094 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 23:23:05,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1677125344] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:05,094 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:23:05,094 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-19 23:23:05,094 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002699933] [2022-03-19 23:23:05,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:23:05,094 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:23:05,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:23:05,095 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:23:05,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2022-03-19 23:23:05,095 INFO L87 Difference]: Start difference. First operand 153 states and 211 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:07,128 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:09,304 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:11,422 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:13,595 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:15,750 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:17,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:18,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:23:18,217 INFO L93 Difference]: Finished difference Result 168 states and 232 transitions. [2022-03-19 23:23:18,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:23:18,217 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2022-03-19 23:23:18,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:23:18,218 INFO L225 Difference]: With dead ends: 168 [2022-03-19 23:23:18,218 INFO L226 Difference]: Without dead ends: 166 [2022-03-19 23:23:18,218 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 62 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2022-03-19 23:23:18,219 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-03-19 23:23:18,219 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 6 Unknown, 0 Unchecked, 13.1s Time] [2022-03-19 23:23:18,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-03-19 23:23:18,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 141. [2022-03-19 23:23:18,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 115 states have (on average 1.4695652173913043) internal successors, (169), 115 states have internal predecessors, (169), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-19 23:23:18,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 194 transitions. [2022-03-19 23:23:18,226 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 194 transitions. Word has length 36 [2022-03-19 23:23:18,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:23:18,227 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 194 transitions. [2022-03-19 23:23:18,227 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:18,227 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 194 transitions. [2022-03-19 23:23:18,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 23:23:18,228 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:23:18,228 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:23:18,245 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 23:23:18,435 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,SelfDestructingSolverStorable13 [2022-03-19 23:23:18,435 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:23:18,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:23:18,436 INFO L85 PathProgramCache]: Analyzing trace with hash 1647373334, now seen corresponding path program 1 times [2022-03-19 23:23:18,436 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:23:18,436 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224442251] [2022-03-19 23:23:18,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:18,436 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:23:18,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:18,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:23:18,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:18,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:23:18,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:18,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:23:18,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:18,642 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:23:18,642 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:23:18,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224442251] [2022-03-19 23:23:18,643 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224442251] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:18,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385495633] [2022-03-19 23:23:18,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:18,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:23:18,643 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:23:18,650 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) [2022-03-19 23:23:18,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 23:23:18,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:18,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:23:18,690 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:23:19,426 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:23:19,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:23:19,692 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 23:23:19,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385495633] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:19,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:23:19,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-19 23:23:19,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744797709] [2022-03-19 23:23:19,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:23:19,693 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:23:19,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:23:19,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:23:19,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2022-03-19 23:23:19,694 INFO L87 Difference]: Start difference. First operand 141 states and 194 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:21,724 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:23,903 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:26,035 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:28,156 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:30,350 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:32,463 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:34,657 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:36,842 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:36,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:23:36,972 INFO L93 Difference]: Finished difference Result 181 states and 251 transitions. [2022-03-19 23:23:36,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:23:36,976 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-03-19 23:23:36,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:23:36,976 INFO L225 Difference]: With dead ends: 181 [2022-03-19 23:23:36,976 INFO L226 Difference]: Without dead ends: 179 [2022-03-19 23:23:36,977 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-03-19 23:23:36,977 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-19 23:23:36,977 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-19 23:23:36,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-03-19 23:23:36,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2022-03-19 23:23:36,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 147 states have (on average 1.4829931972789117) internal successors, (218), 147 states have internal predecessors, (218), 16 states have call successors, (16), 16 states have call predecessors, (16), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-19 23:23:36,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 249 transitions. [2022-03-19 23:23:36,990 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 249 transitions. Word has length 37 [2022-03-19 23:23:36,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:23:36,990 INFO L478 AbstractCegarLoop]: Abstraction has 179 states and 249 transitions. [2022-03-19 23:23:36,990 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:36,990 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 249 transitions. [2022-03-19 23:23:36,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 23:23:36,991 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:23:36,991 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:23:37,008 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 23:23:37,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:23:37,191 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:23:37,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:23:37,192 INFO L85 PathProgramCache]: Analyzing trace with hash 582945322, now seen corresponding path program 1 times [2022-03-19 23:23:37,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:23:37,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205548698] [2022-03-19 23:23:37,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:37,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:23:37,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:37,245 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:23:37,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:37,248 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:23:37,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:37,252 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-19 23:23:37,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:37,254 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:23:37,254 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:23:37,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205548698] [2022-03-19 23:23:37,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205548698] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:37,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274666352] [2022-03-19 23:23:37,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:37,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:23:37,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:23:37,255 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) [2022-03-19 23:23:37,256 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 23:23:37,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:37,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:23:37,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:23:37,836 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:23:37,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:23:38,045 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-19 23:23:38,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274666352] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:38,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:23:38,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-19 23:23:38,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081902579] [2022-03-19 23:23:38,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:23:38,045 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:23:38,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:23:38,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:23:38,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-03-19 23:23:38,046 INFO L87 Difference]: Start difference. First operand 179 states and 249 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:40,076 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:42,252 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:44,362 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:46,535 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:48,652 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:50,836 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:52,956 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:55,068 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:23:55,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:23:55,277 INFO L93 Difference]: Finished difference Result 208 states and 291 transitions. [2022-03-19 23:23:55,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:23:55,277 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-03-19 23:23:55,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:23:55,278 INFO L225 Difference]: With dead ends: 208 [2022-03-19 23:23:55,278 INFO L226 Difference]: Without dead ends: 206 [2022-03-19 23:23:55,279 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:23:55,279 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-19 23:23:55,279 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-19 23:23:55,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-03-19 23:23:55,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2022-03-19 23:23:55,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 158 states have (on average 1.4873417721518987) internal successors, (235), 158 states have internal predecessors, (235), 17 states have call successors, (17), 17 states have call predecessors, (17), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-19 23:23:55,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 268 transitions. [2022-03-19 23:23:55,323 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 268 transitions. Word has length 37 [2022-03-19 23:23:55,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:23:55,323 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 268 transitions. [2022-03-19 23:23:55,323 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:55,323 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 268 transitions. [2022-03-19 23:23:55,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 23:23:55,324 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:23:55,324 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:23:55,340 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 23:23:55,540 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-19 23:23:55,540 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:23:55,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:23:55,540 INFO L85 PathProgramCache]: Analyzing trace with hash 1168540410, now seen corresponding path program 1 times [2022-03-19 23:23:55,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:23:55,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2025638522] [2022-03-19 23:23:55,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:55,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:23:55,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:55,690 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:23:55,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:55,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:23:55,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:55,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:23:55,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:55,714 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:23:55,714 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:23:55,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2025638522] [2022-03-19 23:23:55,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2025638522] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:55,715 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522631322] [2022-03-19 23:23:55,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:23:55,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:23:55,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:23:55,716 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) [2022-03-19 23:23:55,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 23:23:55,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:23:55,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:23:55,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:23:56,359 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:23:56,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:23:56,602 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-19 23:23:56,602 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522631322] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:23:56,602 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:23:56,602 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-19 23:23:56,602 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258326652] [2022-03-19 23:23:56,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:23:56,603 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:23:56,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:23:56,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:23:56,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-19 23:23:56,603 INFO L87 Difference]: Start difference. First operand 192 states and 268 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:23:58,635 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:00,805 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:02,926 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:05,095 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:07,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:09,398 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:11,513 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:13,634 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:13,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:24:13,843 INFO L93 Difference]: Finished difference Result 223 states and 314 transitions. [2022-03-19 23:24:13,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:24:13,844 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2022-03-19 23:24:13,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:24:13,844 INFO L225 Difference]: With dead ends: 223 [2022-03-19 23:24:13,844 INFO L226 Difference]: Without dead ends: 221 [2022-03-19 23:24:13,845 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 67 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-03-19 23:24:13,845 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-19 23:24:13,845 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-19 23:24:13,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-03-19 23:24:13,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 221. [2022-03-19 23:24:13,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 221 states, 183 states have (on average 1.5027322404371584) internal successors, (275), 183 states have internal predecessors, (275), 19 states have call successors, (19), 19 states have call predecessors, (19), 18 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-19 23:24:13,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 221 states to 221 states and 312 transitions. [2022-03-19 23:24:13,855 INFO L78 Accepts]: Start accepts. Automaton has 221 states and 312 transitions. Word has length 38 [2022-03-19 23:24:13,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:24:13,855 INFO L478 AbstractCegarLoop]: Abstraction has 221 states and 312 transitions. [2022-03-19 23:24:13,855 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:13,855 INFO L276 IsEmpty]: Start isEmpty. Operand 221 states and 312 transitions. [2022-03-19 23:24:13,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 23:24:13,855 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:24:13,856 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:24:13,873 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 23:24:14,071 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,SelfDestructingSolverStorable16 [2022-03-19 23:24:14,071 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:24:14,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:24:14,072 INFO L85 PathProgramCache]: Analyzing trace with hash 512426161, now seen corresponding path program 1 times [2022-03-19 23:24:14,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:24:14,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452922756] [2022-03-19 23:24:14,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:14,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:24:14,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:14,131 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:24:14,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:14,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:24:14,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:14,137 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-19 23:24:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:14,138 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:24:14,138 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:24:14,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452922756] [2022-03-19 23:24:14,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452922756] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:14,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733850018] [2022-03-19 23:24:14,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:14,139 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:24:14,139 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:24:14,150 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) [2022-03-19 23:24:14,151 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 23:24:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:14,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:24:14,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:24:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:24:14,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:24:14,892 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-19 23:24:14,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733850018] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:14,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:24:14,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-19 23:24:14,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967329486] [2022-03-19 23:24:14,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:24:14,893 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:24:14,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:24:14,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:24:14,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-19 23:24:14,894 INFO L87 Difference]: Start difference. First operand 221 states and 312 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:16,922 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:19,100 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:21,217 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:23,328 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:25,499 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:27,703 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:27,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:24:27,892 INFO L93 Difference]: Finished difference Result 248 states and 350 transitions. [2022-03-19 23:24:27,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:24:27,892 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2022-03-19 23:24:27,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:24:27,893 INFO L225 Difference]: With dead ends: 248 [2022-03-19 23:24:27,893 INFO L226 Difference]: Without dead ends: 246 [2022-03-19 23:24:27,894 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:24:27,894 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.0s IncrementalHoareTripleChecker+Time [2022-03-19 23:24:27,894 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 6 Unknown, 0 Unchecked, 13.0s Time] [2022-03-19 23:24:27,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-03-19 23:24:27,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 246. [2022-03-19 23:24:27,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 204 states have (on average 1.5049019607843137) internal successors, (307), 204 states have internal predecessors, (307), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-19 23:24:27,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 348 transitions. [2022-03-19 23:24:27,904 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 348 transitions. Word has length 38 [2022-03-19 23:24:27,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:24:27,904 INFO L478 AbstractCegarLoop]: Abstraction has 246 states and 348 transitions. [2022-03-19 23:24:27,904 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:27,904 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 348 transitions. [2022-03-19 23:24:27,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 23:24:27,905 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:24:27,905 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:24:27,924 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-19 23:24:28,105 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-19 23:24:28,106 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:24:28,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:24:28,106 INFO L85 PathProgramCache]: Analyzing trace with hash 344916415, now seen corresponding path program 1 times [2022-03-19 23:24:28,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:24:28,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506135903] [2022-03-19 23:24:28,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:28,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:24:28,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:28,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:24:28,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:28,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:24:28,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:28,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-19 23:24:28,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:28,194 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:24:28,194 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:24:28,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506135903] [2022-03-19 23:24:28,194 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506135903] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:28,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947021302] [2022-03-19 23:24:28,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:28,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:24:28,195 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:24:28,196 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) [2022-03-19 23:24:28,210 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 23:24:28,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:28,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:24:28,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:24:28,842 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:24:28,842 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:24:29,066 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-19 23:24:29,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947021302] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:29,066 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:24:29,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-19 23:24:29,066 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302759544] [2022-03-19 23:24:29,066 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:24:29,067 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:24:29,067 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:24:29,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:24:29,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-19 23:24:29,067 INFO L87 Difference]: Start difference. First operand 246 states and 348 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:31,097 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:33,274 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:35,398 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:37,524 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:39,634 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:41,807 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:43,987 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:46,103 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:46,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:24:46,333 INFO L93 Difference]: Finished difference Result 263 states and 373 transitions. [2022-03-19 23:24:46,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:24:46,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 39 [2022-03-19 23:24:46,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:24:46,335 INFO L225 Difference]: With dead ends: 263 [2022-03-19 23:24:46,335 INFO L226 Difference]: Without dead ends: 261 [2022-03-19 23:24:46,336 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:24:46,336 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-19 23:24:46,336 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 57 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-19 23:24:46,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-03-19 23:24:46,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 261. [2022-03-19 23:24:46,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 217 states have (on average 1.5115207373271888) internal successors, (328), 217 states have internal predecessors, (328), 22 states have call successors, (22), 22 states have call predecessors, (22), 21 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 23:24:46,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 371 transitions. [2022-03-19 23:24:46,349 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 371 transitions. Word has length 39 [2022-03-19 23:24:46,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:24:46,349 INFO L478 AbstractCegarLoop]: Abstraction has 261 states and 371 transitions. [2022-03-19 23:24:46,349 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 371 transitions. [2022-03-19 23:24:46,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 23:24:46,350 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:24:46,350 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:24:46,370 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 23:24:46,563 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:24:46,564 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:24:46,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:24:46,564 INFO L85 PathProgramCache]: Analyzing trace with hash 617179226, now seen corresponding path program 1 times [2022-03-19 23:24:46,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:24:46,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044994740] [2022-03-19 23:24:46,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:46,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:24:46,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:46,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:24:46,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:46,630 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:24:46,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:46,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-19 23:24:46,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:46,637 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 23:24:46,637 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:24:46,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044994740] [2022-03-19 23:24:46,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044994740] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:46,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604540017] [2022-03-19 23:24:46,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:24:46,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:24:46,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:24:46,638 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) [2022-03-19 23:24:46,656 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 23:24:46,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:24:46,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 23:24:46,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 23:24:47,413 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 23:24:47,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 23:24:47,604 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-19 23:24:47,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604540017] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-19 23:24:47,604 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-19 23:24:47,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-19 23:24:47,604 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817956590] [2022-03-19 23:24:47,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 23:24:47,605 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 23:24:47,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-19 23:24:47,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 23:24:47,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-03-19 23:24:47,605 INFO L87 Difference]: Start difference. First operand 261 states and 371 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:24:49,634 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:51,815 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:53,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:56,059 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:24:58,177 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:00,348 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:02,466 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:04,575 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:06,771 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:08,965 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-19 23:25:09,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 23:25:09,101 INFO L93 Difference]: Finished difference Result 277 states and 394 transitions. [2022-03-19 23:25:09,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 23:25:09,101 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2022-03-19 23:25:09,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 23:25:09,102 INFO L225 Difference]: With dead ends: 277 [2022-03-19 23:25:09,102 INFO L226 Difference]: Without dead ends: 275 [2022-03-19 23:25:09,102 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 73 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2022-03-19 23:25:09,103 INFO L913 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-03-19 23:25:09,103 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 57 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-03-19 23:25:09,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-03-19 23:25:09,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 275. [2022-03-19 23:25:09,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 229 states have (on average 1.51528384279476) internal successors, (347), 229 states have internal predecessors, (347), 23 states have call successors, (23), 23 states have call predecessors, (23), 22 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-03-19 23:25:09,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 392 transitions. [2022-03-19 23:25:09,113 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 392 transitions. Word has length 41 [2022-03-19 23:25:09,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 23:25:09,114 INFO L478 AbstractCegarLoop]: Abstraction has 275 states and 392 transitions. [2022-03-19 23:25:09,114 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 23:25:09,114 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 392 transitions. [2022-03-19 23:25:09,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 23:25:09,114 INFO L491 BasicCegarLoop]: Found error trace [2022-03-19 23:25:09,114 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 23:25:09,146 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 23:25:09,315 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:25:09,315 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 23:25:09,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 23:25:09,315 INFO L85 PathProgramCache]: Analyzing trace with hash 1955359922, now seen corresponding path program 1 times [2022-03-19 23:25:09,315 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 23:25:09,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996168822] [2022-03-19 23:25:09,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:25:09,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 23:25:09,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:25:09,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 23:25:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:25:09,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-19 23:25:09,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:25:09,538 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-19 23:25:09,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:25:09,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-03-19 23:25:09,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 23:25:09,546 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 23:25:09,546 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 23:25:09,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996168822] [2022-03-19 23:25:09,546 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996168822] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 23:25:09,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438368153] [2022-03-19 23:25:09,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 23:25:09,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 23:25:09,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 23:25:09,560 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) [2022-03-19 23:25:09,561 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process