/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/sumt9.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-18 12:59:00,333 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 12:59:00,335 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 12:59:00,386 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 12:59:00,430 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 [2022-03-18 12:59:00,456 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 12:59:00,457 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 12:59:00,457 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-18 12:59:00,457 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-18 12:59:00,457 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-18 12:59:00,458 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-18 12:59:00,458 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-18 12:59:00,458 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-18 12:59:00,458 INFO L138 SettingsManager]: * Use SBE=true [2022-03-18 12:59:00,458 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-18 12:59:00,459 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 12:59:00,460 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:59:00,460 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 12:59:00,460 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-18 12:59:00,461 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 12:59:00,461 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 12:59:00,656 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 12:59:00,682 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 12:59:00,685 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 12:59:00,685 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 12:59:00,686 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 12:59:00,686 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt9.c [2022-03-18 12:59:00,744 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2906ae389/40d374aef96c42ada7e95d5279baa026/FLAGdd50224ce [2022-03-18 12:59:01,169 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 12:59:01,170 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt9.c [2022-03-18 12:59:01,176 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2906ae389/40d374aef96c42ada7e95d5279baa026/FLAGdd50224ce [2022-03-18 12:59:01,187 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2906ae389/40d374aef96c42ada7e95d5279baa026 [2022-03-18 12:59:01,192 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 12:59:01,193 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 12:59:01,194 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 12:59:01,194 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 12:59:01,197 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 12:59:01,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,198 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@385bd8b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01, skipping insertion in model container [2022-03-18 12:59:01,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,204 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 12:59:01,217 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 12:59:01,377 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/sumt9.c[403,416] [2022-03-18 12:59:01,394 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:59:01,401 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 12:59:01,410 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/sumt9.c[403,416] [2022-03-18 12:59:01,431 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:59:01,446 INFO L208 MainTranslator]: Completed translation [2022-03-18 12:59:01,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01 WrapperNode [2022-03-18 12:59:01,446 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 12:59:01,447 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 12:59:01,447 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 12:59:01,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 12:59:01,456 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,456 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,462 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,462 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,473 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,474 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,476 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 12:59:01,476 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 12:59:01,476 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 12:59:01,477 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 12:59:01,482 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (1/1) ... [2022-03-18 12:59:01,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:59:01,496 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:59:01,508 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 12:59:01,523 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 12:59:01,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 12:59:01,553 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 12:59:01,553 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 12:59:01,554 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 12:59:01,556 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 12:59:01,556 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 12:59:01,556 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 12:59:01,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 12:59:01,615 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 12:59:01,616 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 12:59:12,554 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 12:59:12,559 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 12:59:12,560 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 12:59:12,561 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:59:12 BoogieIcfgContainer [2022-03-18 12:59:12,561 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 12:59:12,563 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 12:59:12,563 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 12:59:12,565 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 12:59:12,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:59:01" (1/3) ... [2022-03-18 12:59:12,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c431c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:59:12, skipping insertion in model container [2022-03-18 12:59:12,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:59:01" (2/3) ... [2022-03-18 12:59:12,566 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c431c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:59:12, skipping insertion in model container [2022-03-18 12:59:12,566 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:59:12" (3/3) ... [2022-03-18 12:59:12,567 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt9.c [2022-03-18 12:59:12,571 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-18 12:59:12,572 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 12:59:12,606 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 12:59:12,611 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 [2022-03-18 12:59:12,611 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 12:59:12,625 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.619047619047619) internal successors, (34), 23 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:59:12,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 12:59:12,629 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:59:12,629 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:59:12,629 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:59:12,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:59:12,633 INFO L85 PathProgramCache]: Analyzing trace with hash 701348598, now seen corresponding path program 1 times [2022-03-18 12:59:12,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:59:12,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109471366] [2022-03-18 12:59:12,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:12,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:59:12,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:13,317 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:13,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:13,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:59:13,333 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:13,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109471366] [2022-03-18 12:59:13,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109471366] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 12:59:13,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 12:59:13,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 12:59:13,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712393218] [2022-03-18 12:59:13,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:13,340 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 12:59:13,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:13,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 12:59:13,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 12:59:13,367 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.619047619047619) internal successors, (34), 23 states have internal predecessors, (34), 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) [2022-03-18 12:59:15,541 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 [] [2022-03-18 12:59:17,830 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:20,024 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:22,136 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:24,245 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:26,395 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:28,553 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:30,709 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:32,857 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:34,995 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:37,143 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:39,410 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:41,561 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:41,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:59:41,784 INFO L93 Difference]: Finished difference Result 67 states and 97 transitions. [2022-03-18 12:59:41,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 12:59:41,786 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 [2022-03-18 12:59:41,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:59:41,792 INFO L225 Difference]: With dead ends: 67 [2022-03-18 12:59:41,793 INFO L226 Difference]: Without dead ends: 34 [2022-03-18 12:59:41,795 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:59:41,797 INFO L912 BasicCegarLoop]: 28 mSDtfsCounter, 53 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 12 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 28.1s IncrementalHoareTripleChecker+Time [2022-03-18 12:59:41,798 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 65 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 145 Invalid, 13 Unknown, 0 Unchecked, 28.1s Time] [2022-03-18 12:59:41,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-18 12:59:41,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2022-03-18 12:59:41,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.4166666666666667) 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), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:59:41,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2022-03-18 12:59:41,830 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2022-03-18 12:59:41,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:59:41,830 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2022-03-18 12:59:41,831 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) [2022-03-18 12:59:41,831 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2022-03-18 12:59:41,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 12:59:41,832 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:59:41,832 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:59:41,833 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 12:59:41,833 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:59:41,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:59:41,836 INFO L85 PathProgramCache]: Analyzing trace with hash 1047670141, now seen corresponding path program 1 times [2022-03-18 12:59:41,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:59:41,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [651031611] [2022-03-18 12:59:41,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:41,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:59:41,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:42,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:42,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:42,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:59:42,073 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:42,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [651031611] [2022-03-18 12:59:42,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [651031611] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 12:59:42,073 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 12:59:42,074 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 12:59:42,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1139769969] [2022-03-18 12:59:42,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:42,075 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-18 12:59:42,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:42,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-18 12:59:42,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-18 12:59:42,076 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:59:44,161 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:46,272 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:48,443 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:50,558 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:50,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:59:50,729 INFO L93 Difference]: Finished difference Result 49 states and 66 transitions. [2022-03-18 12:59:50,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 12:59:50,730 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 12:59:50,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:59:50,732 INFO L225 Difference]: With dead ends: 49 [2022-03-18 12:59:50,732 INFO L226 Difference]: Without dead ends: 32 [2022-03-18 12:59:50,733 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2022-03-18 12:59:50,734 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 88 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 12 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2022-03-18 12:59:50,734 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 34 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 28 Invalid, 4 Unknown, 0 Unchecked, 8.6s Time] [2022-03-18 12:59:50,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-18 12:59:50,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-18 12:59:50,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 24 states have (on average 1.375) internal successors, (33), 25 states have internal predecessors, (33), 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) [2022-03-18 12:59:50,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2022-03-18 12:59:50,743 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 15 [2022-03-18 12:59:50,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:59:50,743 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2022-03-18 12:59:50,743 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:59:50,743 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2022-03-18 12:59:50,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 12:59:50,747 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:59:50,747 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:59:50,747 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 12:59:50,748 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:59:50,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:59:50,748 INFO L85 PathProgramCache]: Analyzing trace with hash -133245550, now seen corresponding path program 1 times [2022-03-18 12:59:50,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:59:50,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450391436] [2022-03-18 12:59:50,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:50,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:59:50,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:50,929 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:50,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:50,938 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 12:59:50,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:50,950 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:59:50,950 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:50,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450391436] [2022-03-18 12:59:50,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450391436] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:50,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061927364] [2022-03-18 12:59:50,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:50,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:59:50,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:59:50,959 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 12:59:50,961 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 12:59:51,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:51,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 12:59:51,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:59:51,585 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 12:59:51,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:59:51,897 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 12:59:51,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061927364] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:51,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 12:59:51,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 12:59:51,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877550206] [2022-03-18 12:59:51,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:51,898 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 12:59:51,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:51,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 12:59:51,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:59:51,899 INFO L87 Difference]: Start difference. First operand 32 states and 40 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) [2022-03-18 12:59:53,944 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:56,134 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:58,285 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:00,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:02,600 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:04,751 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:06,904 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:09,097 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:11,244 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 [] [2022-03-18 13:00:11,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:11,419 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-18 13:00:11,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:11,420 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 [2022-03-18 13:00:11,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:11,421 INFO L225 Difference]: With dead ends: 42 [2022-03-18 13:00:11,421 INFO L226 Difference]: Without dead ends: 40 [2022-03-18 13:00:11,421 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:00:11,422 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 5 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:11,422 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 98 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 51 Invalid, 9 Unknown, 0 Unchecked, 19.5s Time] [2022-03-18 13:00:11,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-18 13:00:11,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 34. [2022-03-18 13:00:11,428 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) [2022-03-18 13:00:11,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2022-03-18 13:00:11,428 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 22 [2022-03-18 13:00:11,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:11,429 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2022-03-18 13:00:11,429 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) [2022-03-18 13:00:11,429 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2022-03-18 13:00:11,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 13:00:11,429 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:11,429 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:00:11,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 13:00:11,630 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:11,630 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:11,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:11,631 INFO L85 PathProgramCache]: Analyzing trace with hash 945055329, now seen corresponding path program 1 times [2022-03-18 13:00:11,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:11,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209159469] [2022-03-18 13:00:11,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:11,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:11,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:11,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:11,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:11,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:11,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:11,719 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:11,720 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:11,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209159469] [2022-03-18 13:00:11,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209159469] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:11,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000231702] [2022-03-18 13:00:11,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:11,720 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:11,721 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:11,722 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:00:11,741 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 13:00:11,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:11,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:00:11,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:12,257 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:12,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:12,442 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:00:12,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000231702] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:12,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:12,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:00:12,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433205465] [2022-03-18 13:00:12,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:12,444 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:12,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:12,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:12,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:00:12,444 INFO L87 Difference]: Start difference. First operand 34 states and 43 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) [2022-03-18 13:00:14,493 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 [] [2022-03-18 13:00:16,684 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:18,800 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:20,957 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:23,078 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:25,239 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:27,399 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:29,554 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:31,727 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:31,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:31,911 INFO L93 Difference]: Finished difference Result 46 states and 58 transitions. [2022-03-18 13:00:31,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:31,911 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 [2022-03-18 13:00:31,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:31,912 INFO L225 Difference]: With dead ends: 46 [2022-03-18 13:00:31,912 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 13:00:31,913 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:00:31,914 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:31,914 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 86 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-18 13:00:31,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 13:00:31,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 35. [2022-03-18 13:00:31,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 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) [2022-03-18 13:00:31,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2022-03-18 13:00:31,928 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 23 [2022-03-18 13:00:31,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:31,928 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2022-03-18 13:00:31,928 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) [2022-03-18 13:00:31,928 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2022-03-18 13:00:31,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 13:00:31,930 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:31,930 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:00:31,958 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 13:00:32,143 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-03-18 13:00:32,144 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:32,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:32,144 INFO L85 PathProgramCache]: Analyzing trace with hash 155789965, now seen corresponding path program 1 times [2022-03-18 13:00:32,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:32,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773267633] [2022-03-18 13:00:32,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:32,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:32,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:32,293 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:32,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:32,300 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:32,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:32,306 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:32,306 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:32,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773267633] [2022-03-18 13:00:32,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773267633] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:32,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919714216] [2022-03-18 13:00:32,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:32,307 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:32,307 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:32,308 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:00:32,342 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 13:00:32,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:32,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:00:32,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:32,917 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:32,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:33,101 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:00:33,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919714216] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:33,101 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:33,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:00:33,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313059581] [2022-03-18 13:00:33,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:33,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:33,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:33,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:33,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:00:33,103 INFO L87 Difference]: Start difference. First operand 35 states and 45 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) [2022-03-18 13:00:35,147 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:37,332 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:39,493 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:41,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:43,811 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:45,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:48,086 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:50,243 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:52,418 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 [] [2022-03-18 13:00:52,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:52,418 INFO L93 Difference]: Finished difference Result 47 states and 60 transitions. [2022-03-18 13:00:52,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:52,538 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 [2022-03-18 13:00:52,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:52,539 INFO L225 Difference]: With dead ends: 47 [2022-03-18 13:00:52,539 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 13:00:52,540 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:00:52,540 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:52,541 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 59 Invalid, 9 Unknown, 0 Unchecked, 19.3s Time] [2022-03-18 13:00:52,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 13:00:52,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2022-03-18 13:00:52,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 28 states have internal predecessors, (40), 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) [2022-03-18 13:00:52,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2022-03-18 13:00:52,550 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 24 [2022-03-18 13:00:52,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:52,551 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2022-03-18 13:00:52,552 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) [2022-03-18 13:00:52,552 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2022-03-18 13:00:52,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 13:00:52,552 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:52,552 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:00:52,570 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-03-18 13:00:52,753 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:52,754 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:52,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:52,754 INFO L85 PathProgramCache]: Analyzing trace with hash 1601513212, now seen corresponding path program 1 times [2022-03-18 13:00:52,754 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:52,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597093069] [2022-03-18 13:00:52,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:52,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:52,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:52,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:52,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:53,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:53,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:53,019 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:53,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:53,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597093069] [2022-03-18 13:00:53,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597093069] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:53,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501812618] [2022-03-18 13:00:53,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:53,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:53,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:53,021 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:00:53,029 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 13:00:53,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:53,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:00:53,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:53,632 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:00:53,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:53,885 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:00:53,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501812618] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:53,885 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:53,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-03-18 13:00:53,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094969088] [2022-03-18 13:00:53,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:53,886 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:53,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:53,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:53,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:00:53,890 INFO L87 Difference]: Start difference. First operand 36 states and 47 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) [2022-03-18 13:00:55,928 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 [] [2022-03-18 13:00:58,117 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:00,233 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:02,394 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:04,553 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:06,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:08,883 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:11,044 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:13,201 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:13,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:01:13,333 INFO L93 Difference]: Finished difference Result 59 states and 77 transitions. [2022-03-18 13:01:13,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:01:13,334 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 [2022-03-18 13:01:13,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:01:13,335 INFO L225 Difference]: With dead ends: 59 [2022-03-18 13:01:13,335 INFO L226 Difference]: Without dead ends: 57 [2022-03-18 13:01:13,335 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-18 13:01:13,336 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:01:13,336 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-18 13:01:13,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-18 13:01:13,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-18 13:01:13,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 45 states have internal predecessors, (64), 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) [2022-03-18 13:01:13,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 75 transitions. [2022-03-18 13:01:13,345 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 75 transitions. Word has length 25 [2022-03-18 13:01:13,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:01:13,346 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 75 transitions. [2022-03-18 13:01:13,346 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) [2022-03-18 13:01:13,346 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 75 transitions. [2022-03-18 13:01:13,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-18 13:01:13,347 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:01:13,347 INFO L500 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] [2022-03-18 13:01:13,370 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-03-18 13:01:13,567 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:13,567 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:01:13,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:01:13,568 INFO L85 PathProgramCache]: Analyzing trace with hash -682560632, now seen corresponding path program 1 times [2022-03-18 13:01:13,568 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:01:13,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839361747] [2022-03-18 13:01:13,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:13,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:01:13,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:13,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:01:13,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:13,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:01:13,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:13,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:01:13,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:01:13,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839361747] [2022-03-18 13:01:13,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839361747] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:13,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225023692] [2022-03-18 13:01:13,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:13,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:13,850 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:01:13,852 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:01:13,856 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 13:01:13,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:13,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:01:13,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:01:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:01:14,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:01:14,665 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:01:14,666 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225023692] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:14,666 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:01:14,666 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-03-18 13:01:14,666 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74822255] [2022-03-18 13:01:14,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:01:14,666 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:01:14,667 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:01:14,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:01:14,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:01:14,668 INFO L87 Difference]: Start difference. First operand 57 states and 75 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) [2022-03-18 13:01:16,707 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:18,889 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:20,998 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:23,162 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:25,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:27,439 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:29,599 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:31,748 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:33,902 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:36,020 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:36,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:01:36,020 INFO L93 Difference]: Finished difference Result 72 states and 96 transitions. [2022-03-18 13:01:36,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:01:36,134 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 [2022-03-18 13:01:36,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:01:36,135 INFO L225 Difference]: With dead ends: 72 [2022-03-18 13:01:36,135 INFO L226 Difference]: Without dead ends: 70 [2022-03-18 13:01:36,136 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-18 13:01:36,136 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:01:36,137 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 10 Unknown, 0 Unchecked, 21.3s Time] [2022-03-18 13:01:36,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-18 13:01:36,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2022-03-18 13:01:36,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 56 states have (on average 1.4464285714285714) internal successors, (81), 56 states have internal predecessors, (81), 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) [2022-03-18 13:01:36,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 94 transitions. [2022-03-18 13:01:36,148 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 94 transitions. Word has length 26 [2022-03-18 13:01:36,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:01:36,148 INFO L478 AbstractCegarLoop]: Abstraction has 70 states and 94 transitions. [2022-03-18 13:01:36,148 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) [2022-03-18 13:01:36,148 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 94 transitions. [2022-03-18 13:01:36,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 13:01:36,149 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:01:36,149 INFO L500 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] [2022-03-18 13:01:36,166 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-18 13:01:36,350 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:36,351 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:01:36,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:01:36,351 INFO L85 PathProgramCache]: Analyzing trace with hash 1668739991, now seen corresponding path program 1 times [2022-03-18 13:01:36,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:01:36,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1160070525] [2022-03-18 13:01:36,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:36,352 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:01:36,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:36,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:01:36,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:36,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:01:36,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:36,432 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:01:36,432 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:01:36,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1160070525] [2022-03-18 13:01:36,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1160070525] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:36,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645355920] [2022-03-18 13:01:36,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:36,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:36,432 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:01:36,434 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:01:36,435 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 13:01:36,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:36,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:01:36,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:01:37,007 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:01:37,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:01:37,159 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:01:37,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645355920] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:37,159 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:01:37,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:01:37,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252124619] [2022-03-18 13:01:37,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:01:37,160 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:01:37,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:01:37,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:01:37,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:01:37,160 INFO L87 Difference]: Start difference. First operand 70 states and 94 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) [2022-03-18 13:01:39,198 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:41,383 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:43,497 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:45,653 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:47,765 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:49,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:52,073 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:54,179 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:56,299 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:58,402 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:00,505 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:02,666 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:02,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:02,794 INFO L93 Difference]: Finished difference Result 87 states and 119 transitions. [2022-03-18 13:02:02,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:02,795 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 [2022-03-18 13:02:02,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:02,796 INFO L225 Difference]: With dead ends: 87 [2022-03-18 13:02:02,796 INFO L226 Difference]: Without dead ends: 85 [2022-03-18 13:02:02,796 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:02:02,797 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.6s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:02,797 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 12 Unknown, 0 Unchecked, 25.6s Time] [2022-03-18 13:02:02,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-18 13:02:02,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 84. [2022-03-18 13:02:02,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 68 states have internal predecessors, (100), 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) [2022-03-18 13:02:02,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 115 transitions. [2022-03-18 13:02:02,808 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 115 transitions. Word has length 27 [2022-03-18 13:02:02,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:02,808 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 115 transitions. [2022-03-18 13:02:02,808 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) [2022-03-18 13:02:02,809 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 115 transitions. [2022-03-18 13:02:02,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 13:02:02,809 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:02,809 INFO L500 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] [2022-03-18 13:02:02,828 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 13:02:03,019 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:03,020 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:03,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:03,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1687761027, now seen corresponding path program 1 times [2022-03-18 13:02:03,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:03,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186056697] [2022-03-18 13:02:03,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:03,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:03,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:03,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:03,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:03,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:03,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:03,220 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:02:03,220 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:03,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186056697] [2022-03-18 13:02:03,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186056697] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:03,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806114508] [2022-03-18 13:02:03,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:03,221 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:03,221 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:03,222 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:02:03,223 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-18 13:02:03,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:03,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:02:03,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:03,871 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:02:03,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:04,076 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:04,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806114508] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:04,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:04,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-03-18 13:02:04,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608281308] [2022-03-18 13:02:04,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:04,077 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:04,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:04,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:04,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:02:04,078 INFO L87 Difference]: Start difference. First operand 84 states and 115 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) [2022-03-18 13:02:06,135 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:08,315 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:10,423 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:12,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:14,689 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:16,845 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:19,004 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:21,126 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:23,308 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 [] [2022-03-18 13:02:23,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:23,308 INFO L93 Difference]: Finished difference Result 100 states and 138 transitions. [2022-03-18 13:02:23,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:23,413 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 [2022-03-18 13:02:23,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:23,414 INFO L225 Difference]: With dead ends: 100 [2022-03-18 13:02:23,414 INFO L226 Difference]: Without dead ends: 98 [2022-03-18 13:02:23,414 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2022-03-18 13:02:23,415 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.2s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:23,415 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 9 Unknown, 0 Unchecked, 19.2s Time] [2022-03-18 13:02:23,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-18 13:02:23,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 85. [2022-03-18 13:02:23,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 69 states have (on average 1.4782608695652173) internal successors, (102), 69 states have internal predecessors, (102), 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) [2022-03-18 13:02:23,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-03-18 13:02:23,427 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 28 [2022-03-18 13:02:23,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:23,427 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-03-18 13:02:23,427 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) [2022-03-18 13:02:23,427 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-03-18 13:02:23,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-18 13:02:23,428 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:23,428 INFO L500 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, 1] [2022-03-18 13:02:23,450 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-18 13:02:23,643 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:23,643 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:23,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:23,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1874408398, now seen corresponding path program 1 times [2022-03-18 13:02:23,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:23,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459233032] [2022-03-18 13:02:23,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:23,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:23,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:23,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:23,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:23,734 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:23,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:23,739 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:02:23,740 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:23,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459233032] [2022-03-18 13:02:23,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459233032] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:23,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912357629] [2022-03-18 13:02:23,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:23,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:23,740 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:23,741 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:02:23,748 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-18 13:02:23,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:23,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-18 13:02:23,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:24,282 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 13:02:24,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:24,440 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:24,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912357629] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:24,440 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:24,440 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:02:24,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857179414] [2022-03-18 13:02:24,440 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:24,441 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:24,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:24,441 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:24,441 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:02:24,441 INFO L87 Difference]: Start difference. First operand 85 states and 117 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) [2022-03-18 13:02:26,483 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 [] [2022-03-18 13:02:28,677 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:30,835 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:32,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:35,099 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:37,255 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:39,397 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:41,507 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:43,686 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:45,816 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 [] [2022-03-18 13:02:45,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:45,925 INFO L93 Difference]: Finished difference Result 116 states and 163 transitions. [2022-03-18 13:02:45,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:45,926 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 29 [2022-03-18 13:02:45,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:45,927 INFO L225 Difference]: With dead ends: 116 [2022-03-18 13:02:45,927 INFO L226 Difference]: Without dead ends: 114 [2022-03-18 13:02:45,927 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:02:45,928 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 4 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:45,928 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 79 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-03-18 13:02:45,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-18 13:02:45,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 104. [2022-03-18 13:02:45,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 104 states, 86 states have (on average 1.5232558139534884) internal successors, (131), 86 states have internal predecessors, (131), 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) [2022-03-18 13:02:45,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 148 transitions. [2022-03-18 13:02:45,939 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 148 transitions. Word has length 29 [2022-03-18 13:02:45,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:45,939 INFO L478 AbstractCegarLoop]: Abstraction has 104 states and 148 transitions. [2022-03-18 13:02:45,940 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) [2022-03-18 13:02:45,940 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 148 transitions. [2022-03-18 13:02:45,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-18 13:02:45,941 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:45,941 INFO L500 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] [2022-03-18 13:02:45,962 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-18 13:02:46,155 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-18 13:02:46,155 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:46,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:46,156 INFO L85 PathProgramCache]: Analyzing trace with hash 630645509, now seen corresponding path program 1 times [2022-03-18 13:02:46,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:46,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139343083] [2022-03-18 13:02:46,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:46,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:46,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:46,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:46,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:46,425 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:46,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:46,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:02:46,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:46,443 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:46,443 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:46,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139343083] [2022-03-18 13:02:46,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139343083] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:46,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591126236] [2022-03-18 13:02:46,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:46,443 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:46,443 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:46,444 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:02:46,445 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-18 13:02:46,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:46,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:02:46,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:47,171 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:47,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:47,512 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-18 13:02:47,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591126236] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:47,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:47,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10, 11] total 21 [2022-03-18 13:02:47,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345081095] [2022-03-18 13:02:47,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:47,513 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:47,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:47,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:47,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=365, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:02:47,514 INFO L87 Difference]: Start difference. First operand 104 states and 148 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) [2022-03-18 13:02:49,545 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 [] [2022-03-18 13:02:51,723 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:53,892 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:56,046 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:58,197 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:00,373 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:02,526 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:04,695 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 [] [2022-03-18 13:03:04,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:04,808 INFO L93 Difference]: Finished difference Result 128 states and 180 transitions. [2022-03-18 13:03:04,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:04,809 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 [2022-03-18 13:03:04,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:04,810 INFO L225 Difference]: With dead ends: 128 [2022-03-18 13:03:04,810 INFO L226 Difference]: Without dead ends: 126 [2022-03-18 13:03:04,810 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2022-03-18 13:03:04,811 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:04,811 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-18 13:03:04,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-03-18 13:03:04,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 115. [2022-03-18 13:03:04,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 95 states have (on average 1.5157894736842106) internal successors, (144), 95 states have internal predecessors, (144), 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) [2022-03-18 13:03:04,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 163 transitions. [2022-03-18 13:03:04,823 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 163 transitions. Word has length 35 [2022-03-18 13:03:04,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:04,823 INFO L478 AbstractCegarLoop]: Abstraction has 115 states and 163 transitions. [2022-03-18 13:03:04,823 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) [2022-03-18 13:03:04,823 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 163 transitions. [2022-03-18 13:03:04,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 13:03:04,824 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:04,824 INFO L500 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] [2022-03-18 13:03:04,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-18 13:03:05,031 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:05,031 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:05,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:05,032 INFO L85 PathProgramCache]: Analyzing trace with hash -714688353, now seen corresponding path program 1 times [2022-03-18 13:03:05,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:05,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705655936] [2022-03-18 13:03:05,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:05,032 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:05,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:05,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:05,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:05,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:05,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:05,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:03:05,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:05,277 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:03:05,277 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:05,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705655936] [2022-03-18 13:03:05,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705655936] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:05,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031494953] [2022-03-18 13:03:05,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:05,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:05,278 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:05,279 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:03:05,282 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-18 13:03:05,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:05,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:03:05,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:06,064 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:03:06,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:06,314 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-18 13:03:06,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031494953] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:06,314 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:06,314 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:03:06,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608429887] [2022-03-18 13:03:06,314 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:06,315 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:06,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:06,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:06,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:03:06,316 INFO L87 Difference]: Start difference. First operand 115 states and 163 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) [2022-03-18 13:03:08,346 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 [] [2022-03-18 13:03:10,553 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:12,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:14,809 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:16,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:18,943 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:21,043 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:23,202 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:25,367 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:27,519 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:29,681 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:31,786 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 [] [2022-03-18 13:03:31,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:31,903 INFO L93 Difference]: Finished difference Result 130 states and 184 transitions. [2022-03-18 13:03:31,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:31,903 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 [2022-03-18 13:03:31,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:31,904 INFO L225 Difference]: With dead ends: 130 [2022-03-18 13:03:31,904 INFO L226 Difference]: Without dead ends: 128 [2022-03-18 13:03:31,905 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:03:31,905 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 1 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.6s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:31,905 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 61 Invalid, 11 Unknown, 0 Unchecked, 25.6s Time] [2022-03-18 13:03:31,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-03-18 13:03:31,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2022-03-18 13:03:31,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 96 states have (on average 1.5208333333333333) internal successors, (146), 96 states have internal predecessors, (146), 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) [2022-03-18 13:03:31,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 165 transitions. [2022-03-18 13:03:31,916 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 165 transitions. Word has length 36 [2022-03-18 13:03:31,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:31,916 INFO L478 AbstractCegarLoop]: Abstraction has 116 states and 165 transitions. [2022-03-18 13:03:31,916 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) [2022-03-18 13:03:31,916 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 165 transitions. [2022-03-18 13:03:31,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 13:03:31,917 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:31,918 INFO L500 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] [2022-03-18 13:03:31,943 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-18 13:03:32,143 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-18 13:03:32,143 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:32,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:32,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1471641970, now seen corresponding path program 1 times [2022-03-18 13:03:32,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:32,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315690228] [2022-03-18 13:03:32,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:32,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:32,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:32,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:32,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:32,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:32,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:32,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:03:32,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:32,389 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:03:32,389 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:32,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315690228] [2022-03-18 13:03:32,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315690228] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:32,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370818256] [2022-03-18 13:03:32,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:32,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:32,389 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:32,390 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:03:32,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-18 13:03:32,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:32,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:03:32,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:33,123 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:03:33,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:33,389 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-18 13:03:33,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370818256] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:33,390 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:33,390 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:03:33,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605417959] [2022-03-18 13:03:33,390 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:33,390 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:33,390 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:33,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:33,391 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:03:33,391 INFO L87 Difference]: Start difference. First operand 116 states and 165 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) [2022-03-18 13:03:35,420 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 [] [2022-03-18 13:03:37,624 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:39,734 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:41,889 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:44,044 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:46,207 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:48,358 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:50,540 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:52,642 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:52,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:52,753 INFO L93 Difference]: Finished difference Result 153 states and 216 transitions. [2022-03-18 13:03:52,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:52,753 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 37 [2022-03-18 13:03:52,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:52,755 INFO L225 Difference]: With dead ends: 153 [2022-03-18 13:03:52,755 INFO L226 Difference]: Without dead ends: 151 [2022-03-18 13:03:52,756 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:03:52,757 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:52,758 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 9 Unknown, 0 Unchecked, 19.3s Time] [2022-03-18 13:03:52,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-03-18 13:03:52,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2022-03-18 13:03:52,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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) [2022-03-18 13:03:52,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 214 transitions. [2022-03-18 13:03:52,769 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 214 transitions. Word has length 37 [2022-03-18 13:03:52,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:52,769 INFO L478 AbstractCegarLoop]: Abstraction has 151 states and 214 transitions. [2022-03-18 13:03:52,769 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) [2022-03-18 13:03:52,769 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 214 transitions. [2022-03-18 13:03:52,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 13:03:52,772 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:52,772 INFO L500 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] [2022-03-18 13:03:52,791 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-18 13:03:52,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-18 13:03:52,979 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:52,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:52,980 INFO L85 PathProgramCache]: Analyzing trace with hash 877792218, now seen corresponding path program 1 times [2022-03-18 13:03:52,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:52,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561484506] [2022-03-18 13:03:52,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:52,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:52,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:53,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:53,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:53,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:53,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:53,186 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:03:53,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:53,188 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:03:53,188 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:53,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561484506] [2022-03-18 13:03:53,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561484506] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:53,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132530527] [2022-03-18 13:03:53,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:53,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:53,189 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:53,190 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:03:53,190 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-18 13:03:53,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:53,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:03:53,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:53,941 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:03:53,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:54,185 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-18 13:03:54,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2132530527] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:54,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:54,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:03:54,185 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273569117] [2022-03-18 13:03:54,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:54,186 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:54,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:54,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:54,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:03:54,186 INFO L87 Difference]: Start difference. First operand 151 states and 214 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) [2022-03-18 13:03:56,223 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:58,401 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:00,565 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:02,678 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:04,835 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:06,993 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:09,129 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 [] [2022-03-18 13:04:09,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:09,309 INFO L93 Difference]: Finished difference Result 181 states and 258 transitions. [2022-03-18 13:04:09,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:09,309 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 [2022-03-18 13:04:09,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:09,310 INFO L225 Difference]: With dead ends: 181 [2022-03-18 13:04:09,310 INFO L226 Difference]: Without dead ends: 179 [2022-03-18 13:04:09,311 INFO L911 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 [2022-03-18 13:04:09,311 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:09,312 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 7 Unknown, 0 Unchecked, 15.1s Time] [2022-03-18 13:04:09,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-03-18 13:04:09,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 151. [2022-03-18 13:04:09,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 125 states have (on average 1.512) internal successors, (189), 125 states have internal predecessors, (189), 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) [2022-03-18 13:04:09,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 214 transitions. [2022-03-18 13:04:09,324 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 214 transitions. Word has length 38 [2022-03-18 13:04:09,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:09,324 INFO L478 AbstractCegarLoop]: Abstraction has 151 states and 214 transitions. [2022-03-18 13:04:09,324 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) [2022-03-18 13:04:09,324 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 214 transitions. [2022-03-18 13:04:09,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 13:04:09,325 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:09,325 INFO L500 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] [2022-03-18 13:04:09,350 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-18 13:04:09,539 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-18 13:04:09,539 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:09,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:09,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1317945007, now seen corresponding path program 1 times [2022-03-18 13:04:09,540 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:09,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145030594] [2022-03-18 13:04:09,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:09,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:09,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:09,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:09,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:09,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:09,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:09,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:04:09,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:09,624 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:04:09,624 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:09,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145030594] [2022-03-18 13:04:09,625 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145030594] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:09,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129918310] [2022-03-18 13:04:09,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:09,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:09,625 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:09,626 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:04:09,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-18 13:04:09,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:09,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:04:09,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:04:10,358 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:04:10,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:04:10,571 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-18 13:04:10,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129918310] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:10,571 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:04:10,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:04:10,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949961517] [2022-03-18 13:04:10,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:04:10,572 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:04:10,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:04:10,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:04:10,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:04:10,573 INFO L87 Difference]: Start difference. First operand 151 states and 214 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) [2022-03-18 13:04:12,615 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 [] [2022-03-18 13:04:14,896 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:17,012 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:19,127 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:21,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:23,396 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:25,553 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:27,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:29,816 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:31,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:34,055 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:36,171 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 [] [2022-03-18 13:04:36,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:36,353 INFO L93 Difference]: Finished difference Result 182 states and 260 transitions. [2022-03-18 13:04:36,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:36,353 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 [2022-03-18 13:04:36,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:36,354 INFO L225 Difference]: With dead ends: 182 [2022-03-18 13:04:36,354 INFO L226 Difference]: Without dead ends: 180 [2022-03-18 13:04:36,355 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 68 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:04:36,355 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.8s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:36,355 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 12 Unknown, 0 Unchecked, 25.8s Time] [2022-03-18 13:04:36,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-03-18 13:04:36,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2022-03-18 13:04:36,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 148 states have (on average 1.5202702702702702) internal successors, (225), 148 states have internal predecessors, (225), 15 states have call successors, (15), 15 states have call predecessors, (15), 14 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 13:04:36,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 254 transitions. [2022-03-18 13:04:36,370 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 254 transitions. Word has length 38 [2022-03-18 13:04:36,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:36,370 INFO L478 AbstractCegarLoop]: Abstraction has 178 states and 254 transitions. [2022-03-18 13:04:36,370 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) [2022-03-18 13:04:36,370 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 254 transitions. [2022-03-18 13:04:36,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 13:04:36,371 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:36,371 INFO L500 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] [2022-03-18 13:04:36,394 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-03-18 13:04:36,594 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-18 13:04:36,594 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:36,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:36,594 INFO L85 PathProgramCache]: Analyzing trace with hash -705160695, now seen corresponding path program 1 times [2022-03-18 13:04:36,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:36,595 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744273249] [2022-03-18 13:04:36,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:36,595 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:36,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:36,809 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:36,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:36,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:36,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:36,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:04:36,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:36,845 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:04:36,845 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:36,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744273249] [2022-03-18 13:04:36,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744273249] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:36,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472511631] [2022-03-18 13:04:36,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:36,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:36,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:36,847 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:04:36,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-18 13:04:36,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:36,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:04:36,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:04:37,721 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:04:37,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:04:37,994 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-18 13:04:37,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472511631] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:37,994 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:04:37,994 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:04:37,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811453737] [2022-03-18 13:04:37,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:04:37,994 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:04:37,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:04:37,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:04:37,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:04:37,995 INFO L87 Difference]: Start difference. First operand 178 states and 254 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) [2022-03-18 13:04:40,027 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 [] [2022-03-18 13:04:42,229 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:44,343 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:46,512 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:48,671 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:50,832 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:52,933 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:55,063 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:57,232 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:59,340 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 [] [2022-03-18 13:04:59,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:59,462 INFO L93 Difference]: Finished difference Result 209 states and 300 transitions. [2022-03-18 13:04:59,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:59,462 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 [2022-03-18 13:04:59,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:59,463 INFO L225 Difference]: With dead ends: 209 [2022-03-18 13:04:59,463 INFO L226 Difference]: Without dead ends: 207 [2022-03-18 13:04:59,464 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:04:59,464 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:59,464 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 10 Unknown, 0 Unchecked, 21.4s Time] [2022-03-18 13:04:59,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-03-18 13:04:59,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 194. [2022-03-18 13:04:59,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 162 states have (on average 1.5308641975308641) internal successors, (248), 162 states have internal predecessors, (248), 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) [2022-03-18 13:04:59,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 279 transitions. [2022-03-18 13:04:59,480 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 279 transitions. Word has length 39 [2022-03-18 13:04:59,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:59,480 INFO L478 AbstractCegarLoop]: Abstraction has 194 states and 279 transitions. [2022-03-18 13:04:59,480 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) [2022-03-18 13:04:59,480 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 279 transitions. [2022-03-18 13:04:59,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 13:04:59,481 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:59,481 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:04:59,499 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-03-18 13:04:59,687 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:59,687 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:59,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:59,688 INFO L85 PathProgramCache]: Analyzing trace with hash -2058534231, now seen corresponding path program 1 times [2022-03-18 13:04:59,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:59,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475727769] [2022-03-18 13:04:59,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:59,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:59,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:59,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:59,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:59,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:59,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:59,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 13:04:59,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:59,758 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:04:59,758 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:59,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475727769] [2022-03-18 13:04:59,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475727769] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:59,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242197698] [2022-03-18 13:04:59,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:59,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:59,759 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:59,760 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:04:59,762 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-18 13:04:59,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:59,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:04:59,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:05:00,615 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:05:00,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:05:00,832 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-18 13:05:00,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242197698] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:00,832 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:05:00,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:05:00,833 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510507860] [2022-03-18 13:05:00,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:05:00,833 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:05:00,833 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:05:00,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:05:00,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:05:00,834 INFO L87 Difference]: Start difference. First operand 194 states and 279 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) [2022-03-18 13:05:02,875 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 [] [2022-03-18 13:05:05,044 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:07,149 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:09,263 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:11,428 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:13,544 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:15,708 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:17,874 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:19,984 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:22,104 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:24,310 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:24,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:05:24,428 INFO L93 Difference]: Finished difference Result 210 states and 302 transitions. [2022-03-18 13:05:24,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:05:24,428 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 39 [2022-03-18 13:05:24,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:05:24,429 INFO L225 Difference]: With dead ends: 210 [2022-03-18 13:05:24,429 INFO L226 Difference]: Without dead ends: 208 [2022-03-18 13:05:24,430 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 70 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:05:24,430 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 1 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.6s IncrementalHoareTripleChecker+Time [2022-03-18 13:05:24,430 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 74 Invalid, 11 Unknown, 0 Unchecked, 23.6s Time] [2022-03-18 13:05:24,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-03-18 13:05:24,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2022-03-18 13:05:24,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 173 states have (on average 1.5317919075144508) internal successors, (265), 173 states have internal predecessors, (265), 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) [2022-03-18 13:05:24,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 298 transitions. [2022-03-18 13:05:24,445 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 298 transitions. Word has length 39 [2022-03-18 13:05:24,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:05:24,446 INFO L478 AbstractCegarLoop]: Abstraction has 207 states and 298 transitions. [2022-03-18 13:05:24,446 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) [2022-03-18 13:05:24,446 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 298 transitions. [2022-03-18 13:05:24,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-18 13:05:24,446 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:05:24,447 INFO L500 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, 1] [2022-03-18 13:05:24,463 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-18 13:05:24,651 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 13:05:24,651 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:05:24,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:05:24,652 INFO L85 PathProgramCache]: Analyzing trace with hash 1254429548, now seen corresponding path program 1 times [2022-03-18 13:05:24,652 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:05:24,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213200331] [2022-03-18 13:05:24,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:24,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:05:24,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:24,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:05:24,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:24,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:05:24,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:24,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:05:24,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:24,907 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:05:24,907 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:05:24,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213200331] [2022-03-18 13:05:24,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213200331] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:24,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737649370] [2022-03-18 13:05:24,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:24,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:24,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:05:24,912 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:05:24,913 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-18 13:05:24,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:24,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:05:24,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:05:25,857 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:05:25,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:05:26,160 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2022-03-18 13:05:26,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737649370] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:26,160 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:05:26,160 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:05:26,160 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279534799] [2022-03-18 13:05:26,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:05:26,161 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:05:26,161 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:05:26,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:05:26,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:05:26,161 INFO L87 Difference]: Start difference. First operand 207 states and 298 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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) [2022-03-18 13:05:28,191 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:30,380 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:32,486 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:34,599 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:36,715 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:38,878 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:41,037 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:43,196 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:45,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:47,445 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:49,625 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 [] [2022-03-18 13:05:49,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:05:49,772 INFO L93 Difference]: Finished difference Result 239 states and 346 transitions. [2022-03-18 13:05:49,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:05:49,773 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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 40 [2022-03-18 13:05:49,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:05:49,774 INFO L225 Difference]: With dead ends: 239 [2022-03-18 13:05:49,774 INFO L226 Difference]: Without dead ends: 237 [2022-03-18 13:05:49,775 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 71 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=359, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:05:49,775 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 4 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.6s IncrementalHoareTripleChecker+Time [2022-03-18 13:05:49,775 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 57 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 79 Invalid, 11 Unknown, 0 Unchecked, 23.6s Time] [2022-03-18 13:05:49,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-03-18 13:05:49,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 223. [2022-03-18 13:05:49,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 187 states have (on average 1.5401069518716577) internal successors, (288), 187 states have internal predecessors, (288), 18 states have call successors, (18), 18 states have call predecessors, (18), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 13:05:49,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 323 transitions. [2022-03-18 13:05:49,792 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 323 transitions. Word has length 40 [2022-03-18 13:05:49,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:05:49,792 INFO L478 AbstractCegarLoop]: Abstraction has 223 states and 323 transitions. [2022-03-18 13:05:49,792 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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) [2022-03-18 13:05:49,793 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 323 transitions. [2022-03-18 13:05:49,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-18 13:05:49,793 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:05:49,793 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:05:49,810 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-18 13:05:49,999 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 13:05:49,999 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:05:50,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:05:50,000 INFO L85 PathProgramCache]: Analyzing trace with hash 2042592661, now seen corresponding path program 1 times [2022-03-18 13:05:50,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:05:50,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519462749] [2022-03-18 13:05:50,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:50,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:05:50,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:05:50,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:05:50,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 13:05:50,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,114 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:05:50,114 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:05:50,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1519462749] [2022-03-18 13:05:50,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1519462749] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:50,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741174102] [2022-03-18 13:05:50,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:50,115 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:50,115 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:05:50,116 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:05:50,117 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-18 13:05:50,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:05:50,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:05:50,920 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:05:50,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:05:51,159 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-18 13:05:51,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741174102] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:51,159 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:05:51,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:05:51,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271536785] [2022-03-18 13:05:51,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:05:51,160 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:05:51,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:05:51,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:05:51,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:05:51,160 INFO L87 Difference]: Start difference. First operand 223 states and 323 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) [2022-03-18 13:05:53,210 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 [] [2022-03-18 13:05:55,397 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:57,502 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:59,667 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:01,772 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:03,932 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:06,114 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:08,283 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 [] [2022-03-18 13:06:08,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:06:08,410 INFO L93 Difference]: Finished difference Result 239 states and 346 transitions. [2022-03-18 13:06:08,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:06:08,411 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 40 [2022-03-18 13:06:08,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:06:08,412 INFO L225 Difference]: With dead ends: 239 [2022-03-18 13:06:08,412 INFO L226 Difference]: Without dead ends: 237 [2022-03-18 13:06:08,412 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 72 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:06:08,413 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 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 [2022-03-18 13:06:08,413 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-18 13:06:08,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2022-03-18 13:06:08,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 224. [2022-03-18 13:06:08,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 188 states have (on average 1.5425531914893618) internal successors, (290), 188 states have internal predecessors, (290), 18 states have call successors, (18), 18 states have call predecessors, (18), 17 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 13:06:08,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 325 transitions. [2022-03-18 13:06:08,430 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 325 transitions. Word has length 40 [2022-03-18 13:06:08,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:06:08,430 INFO L478 AbstractCegarLoop]: Abstraction has 224 states and 325 transitions. [2022-03-18 13:06:08,430 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) [2022-03-18 13:06:08,430 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 325 transitions. [2022-03-18 13:06:08,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-18 13:06:08,431 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:06:08,431 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:06:08,452 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-18 13:06:08,643 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:06:08,643 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:06:08,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:06:08,644 INFO L85 PathProgramCache]: Analyzing trace with hash -361887036, now seen corresponding path program 1 times [2022-03-18 13:06:08,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:06:08,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699791110] [2022-03-18 13:06:08,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:06:08,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:06:08,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:08,693 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:06:08,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:08,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:06:08,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:08,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2022-03-18 13:06:08,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:08,702 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:06:08,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:06:08,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699791110] [2022-03-18 13:06:08,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699791110] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:06:08,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545637377] [2022-03-18 13:06:08,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:06:08,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:06:08,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:06:08,704 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:06:08,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-18 13:06:08,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:08,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-18 13:06:08,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:06:09,462 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:06:09,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:06:09,718 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-18 13:06:09,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545637377] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:06:09,718 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:06:09,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:06:09,719 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745996955] [2022-03-18 13:06:09,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:06:09,719 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:06:09,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:06:09,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:06:09,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:06:09,720 INFO L87 Difference]: Start difference. First operand 224 states and 325 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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) [2022-03-18 13:06:11,750 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 [] [2022-03-18 13:06:13,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:16,060 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:18,224 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:20,333 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:22,494 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:24,668 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:06:26,785 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 [] [2022-03-18 13:06:26,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:06:26,993 INFO L93 Difference]: Finished difference Result 255 states and 371 transitions. [2022-03-18 13:06:26,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:06:26,994 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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 [2022-03-18 13:06:26,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:06:26,997 INFO L225 Difference]: With dead ends: 255 [2022-03-18 13:06:26,997 INFO L226 Difference]: Without dead ends: 253 [2022-03-18 13:06:26,998 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 74 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:06:26,998 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 3 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-18 13:06:26,999 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 81 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-18 13:06:27,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-03-18 13:06:27,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 253. [2022-03-18 13:06:27,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 213 states have (on average 1.5492957746478873) internal successors, (330), 213 states have internal predecessors, (330), 20 states have call successors, (20), 20 states have call predecessors, (20), 19 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-18 13:06:27,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 369 transitions. [2022-03-18 13:06:27,022 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 369 transitions. Word has length 41 [2022-03-18 13:06:27,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:06:27,023 INFO L478 AbstractCegarLoop]: Abstraction has 253 states and 369 transitions. [2022-03-18 13:06:27,023 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 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) [2022-03-18 13:06:27,023 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 369 transitions. [2022-03-18 13:06:27,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-18 13:06:27,024 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:06:27,024 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:06:27,040 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-18 13:06:27,224 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:06:27,225 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:06:27,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:06:27,225 INFO L85 PathProgramCache]: Analyzing trace with hash -531923689, now seen corresponding path program 1 times [2022-03-18 13:06:27,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:06:27,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075290375] [2022-03-18 13:06:27,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:06:27,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:06:27,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:27,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:06:27,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:27,418 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:06:27,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:27,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:06:27,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:27,426 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-03-18 13:06:27,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:06:27,428 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-03-18 13:06:27,428 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:06:27,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075290375] [2022-03-18 13:06:27,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075290375] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:06:27,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795381012] [2022-03-18 13:06:27,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:06:27,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:06:27,429 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:06:27,432 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:06:27,453 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process