/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-18 12:58:49,189 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 12:58:49,190 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 12:58:49,209 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 12:58:49,233 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 12:58:49,233 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 12:58:49,234 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 12:58:49,234 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 12:58:49,248 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 12:58:49,249 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 12:58:49,249 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-18 12:58:49,249 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-18 12:58:49,249 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-18 12:58:49,250 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-18 12:58:49,250 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-18 12:58:49,250 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-18 12:58:49,250 INFO L138 SettingsManager]: * Use SBE=true [2022-03-18 12:58:49,250 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-18 12:58:49,251 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 12:58:49,252 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 12:58:49,252 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 12:58:49,252 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 12:58:49,252 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 12:58:49,252 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 12:58:49,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:58:49,252 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-18 12:58:49,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 12:58:49,253 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 12:58:49,414 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 12:58:49,426 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 12:58:49,428 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 12:58:49,428 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 12:58:49,435 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 12:58:49,436 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt8.c [2022-03-18 12:58:49,496 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a4451553a/dc1a4704e7dc47119dd4fbf9d8a2a95a/FLAG2a2ed0499 [2022-03-18 12:58:49,859 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 12:58:49,860 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c [2022-03-18 12:58:49,863 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a4451553a/dc1a4704e7dc47119dd4fbf9d8a2a95a/FLAG2a2ed0499 [2022-03-18 12:58:50,296 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a4451553a/dc1a4704e7dc47119dd4fbf9d8a2a95a [2022-03-18 12:58:50,306 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 12:58:50,307 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 12:58:50,316 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 12:58:50,316 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 12:58:50,320 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 12:58:50,321 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,321 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35b733bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50, skipping insertion in model container [2022-03-18 12:58:50,322 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 12:58:50,334 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 12:58:50,450 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c[403,416] [2022-03-18 12:58:50,475 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:58:50,481 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 12:58:50,490 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt8.c[403,416] [2022-03-18 12:58:50,509 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 12:58:50,517 INFO L208 MainTranslator]: Completed translation [2022-03-18 12:58:50,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50 WrapperNode [2022-03-18 12:58:50,518 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 12:58:50,518 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 12:58:50,518 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 12:58:50,518 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 12:58:50,527 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,527 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,531 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,537 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,540 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,542 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 12:58:50,542 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 12:58:50,542 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 12:58:50,543 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 12:58:50,543 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (1/1) ... [2022-03-18 12:58:50,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 12:58:50,566 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:58:50,578 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 12:58:50,594 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 12:58:50,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 12:58:50,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 12:58:50,605 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 12:58:50,605 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 12:58:50,606 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 12:58:50,606 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 12:58:50,606 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 12:58:50,607 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 12:58:50,607 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 12:58:50,607 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 12:58:50,607 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 12:58:50,652 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 12:58:50,653 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 12:58:59,559 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 12:58:59,563 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 12:58:59,563 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-18 12:58:59,565 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:58:59 BoogieIcfgContainer [2022-03-18 12:58:59,565 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 12:58:59,575 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 12:58:59,575 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 12:58:59,577 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 12:58:59,578 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 12:58:50" (1/3) ... [2022-03-18 12:58:59,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44ccb168 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:58:59, skipping insertion in model container [2022-03-18 12:58:59,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 12:58:50" (2/3) ... [2022-03-18 12:58:59,583 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44ccb168 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 12:58:59, skipping insertion in model container [2022-03-18 12:58:59,583 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 12:58:59" (3/3) ... [2022-03-18 12:58:59,585 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt8.c [2022-03-18 12:58:59,600 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-18 12:58:59,600 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 12:58:59,640 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 12:58:59,644 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 12:58:59,644 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 12:58:59,657 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 22 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:58:59,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 12:58:59,660 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:58:59,660 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 12:58:59,661 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:58:59,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:58:59,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1128394070, now seen corresponding path program 1 times [2022-03-18 12:58:59,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:58:59,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205101232] [2022-03-18 12:58:59,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:58:59,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:58:59,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:00,049 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:00,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:00,057 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 12:59:00,057 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:00,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205101232] [2022-03-18 12:59:00,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205101232] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 12:59:00,058 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 12:59:00,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 12:59:00,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648069794] [2022-03-18 12:59:00,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:00,062 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 12:59:00,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:00,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 12:59:00,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-03-18 12:59:00,080 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 22 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 12:59:02,416 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 12:59:04,581 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:06,704 WARN L534 Checker$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 12:59:08,866 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:11,041 WARN L534 Checker$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 12:59:13,205 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:15,368 WARN L534 Checker$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 12:59:17,514 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:19,764 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:21,924 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:22,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:59:22,175 INFO L93 Difference]: Finished difference Result 66 states and 95 transitions. [2022-03-18 12:59:22,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 12:59:22,177 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 12:59:22,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:59:22,181 INFO L225 Difference]: With dead ends: 66 [2022-03-18 12:59:22,181 INFO L226 Difference]: Without dead ends: 34 [2022-03-18 12:59:22,183 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:59:22,185 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 57 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 14 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.9s IncrementalHoareTripleChecker+Time [2022-03-18 12:59:22,186 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 55 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 124 Invalid, 9 Unknown, 0 Unchecked, 21.9s Time] [2022-03-18 12:59:22,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-18 12:59:22,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2022-03-18 12:59:22,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 24 states have internal predecessors, (31), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:59:22,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2022-03-18 12:59:22,236 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 14 [2022-03-18 12:59:22,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:59:22,236 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2022-03-18 12:59:22,236 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 12:59:22,236 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2022-03-18 12:59:22,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-18 12:59:22,237 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:59:22,237 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 12:59:22,237 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 12:59:22,238 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:59:22,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:59:22,238 INFO L85 PathProgramCache]: Analyzing trace with hash 1294727378, now seen corresponding path program 1 times [2022-03-18 12:59:22,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:59:22,238 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469700045] [2022-03-18 12:59:22,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:22,239 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:59:22,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:22,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:22,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:22,318 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 12:59:22,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:22,341 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 12:59:22,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:22,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469700045] [2022-03-18 12:59:22,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469700045] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:22,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002079699] [2022-03-18 12:59:22,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:22,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:59:22,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:59:22,356 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 12:59:22,369 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 12:59:22,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:22,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 12:59:22,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:59:22,890 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 12:59:22,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:59:23,052 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 12:59:23,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002079699] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:23,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 12:59:23,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 12:59:23,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453224589] [2022-03-18 12:59:23,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:23,053 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 12:59:23,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:23,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 12:59:23,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:59:23,054 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 12:59:25,094 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 12:59:27,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:29,377 WARN L534 Checker$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 12:59:31,544 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:33,707 WARN L534 Checker$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 12:59:35,813 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:37,922 WARN L534 Checker$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 12:59:40,065 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:42,258 WARN L534 Checker$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 12:59:44,419 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 12:59:44,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 12:59:44,599 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-18 12:59:44,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 12:59:44,599 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 12:59:44,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 12:59:44,601 INFO L225 Difference]: With dead ends: 42 [2022-03-18 12:59:44,601 INFO L226 Difference]: Without dead ends: 40 [2022-03-18 12:59:44,602 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 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 12:59:44,602 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-03-18 12:59:44,603 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 86 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 53 Invalid, 9 Unknown, 0 Unchecked, 21.5s Time] [2022-03-18 12:59:44,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-18 12:59:44,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-03-18 12:59:44,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 12:59:44,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2022-03-18 12:59:44,609 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 22 [2022-03-18 12:59:44,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 12:59:44,610 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2022-03-18 12:59:44,610 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 12:59:44,610 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2022-03-18 12:59:44,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 12:59:44,610 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 12:59:44,610 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 12:59:44,644 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-18 12:59:44,811 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:59:44,811 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 12:59:44,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 12:59:44,812 INFO L85 PathProgramCache]: Analyzing trace with hash -1889278409, now seen corresponding path program 1 times [2022-03-18 12:59:44,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 12:59:44,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534069787] [2022-03-18 12:59:44,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:44,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 12:59:44,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:44,957 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 12:59:44,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:44,976 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 12:59:44,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:44,990 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 12:59:44,991 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 12:59:44,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534069787] [2022-03-18 12:59:44,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534069787] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:44,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869936343] [2022-03-18 12:59:44,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 12:59:44,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 12:59:44,991 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 12:59:44,994 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 12:59:44,995 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 12:59:45,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 12:59:45,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 12:59:45,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 12:59:45,430 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 12:59:45,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 12:59:45,589 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 12:59:45,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [869936343] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 12:59:45,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 12:59:45,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 12:59:45,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121590491] [2022-03-18 12:59:45,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 12:59:45,590 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 12:59:45,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 12:59:45,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 12:59:45,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 12:59:45,590 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 12:59:47,628 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 12:59:49,797 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:51,966 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:54,126 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 12:59:56,290 WARN L534 Checker$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 12:59:58,473 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:00,638 WARN L534 Checker$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 13:00:00,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:00,817 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2022-03-18 13:00:00,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:00,818 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 13:00:00,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:00,819 INFO L225 Difference]: With dead ends: 44 [2022-03-18 13:00:00,819 INFO L226 Difference]: Without dead ends: 42 [2022-03-18 13:00:00,819 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:00:00,820 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:00,820 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 86 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 7 Unknown, 0 Unchecked, 15.2s Time] [2022-03-18 13:00:00,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-18 13:00:00,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2022-03-18 13:00:00,824 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 13:00:00,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2022-03-18 13:00:00,825 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 23 [2022-03-18 13:00:00,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:00,825 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2022-03-18 13:00:00,825 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 13:00:00,826 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2022-03-18 13:00:00,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 13:00:00,826 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:00,826 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 13:00:00,842 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 13:00:01,026 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-18 13:00:01,027 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:01,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:01,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1666064243, now seen corresponding path program 1 times [2022-03-18 13:00:01,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:01,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145338416] [2022-03-18 13:00:01,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:01,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:01,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:01,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:01,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:01,149 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:01,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:01,164 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 13:00:01,165 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:01,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145338416] [2022-03-18 13:00:01,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145338416] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:01,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373225626] [2022-03-18 13:00:01,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:01,169 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:01,169 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:01,184 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 13:00:01,214 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 13:00:01,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:01,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 13:00:01,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:01,710 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 13:00:01,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:01,951 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 13:00:01,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373225626] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:01,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:01,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:00:01,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747788655] [2022-03-18 13:00:01,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:01,952 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:01,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:01,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:01,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:00:01,953 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:00:03,997 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:06,183 WARN L534 Checker$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 13:00:08,289 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:10,402 WARN L534 Checker$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 13:00:12,516 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:14,664 WARN L534 Checker$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 13:00:16,839 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:18,959 WARN L534 Checker$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 13:00:21,127 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:23,314 WARN L534 Checker$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 13:00:25,480 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:25,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:25,672 INFO L93 Difference]: Finished difference Result 55 states and 69 transitions. [2022-03-18 13:00:25,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:25,673 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 13:00:25,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:25,674 INFO L225 Difference]: With dead ends: 55 [2022-03-18 13:00:25,674 INFO L226 Difference]: Without dead ends: 53 [2022-03-18 13:00:25,674 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 3 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 13:00:25,675 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 0 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.7s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:25,676 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 82 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 55 Invalid, 11 Unknown, 0 Unchecked, 23.7s Time] [2022-03-18 13:00:25,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-18 13:00:25,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-18 13:00:25,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-18 13:00:25,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 67 transitions. [2022-03-18 13:00:25,692 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 67 transitions. Word has length 24 [2022-03-18 13:00:25,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:25,692 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 67 transitions. [2022-03-18 13:00:25,693 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 13:00:25,693 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 67 transitions. [2022-03-18 13:00:25,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-18 13:00:25,693 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:25,693 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 13:00:25,720 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 13:00:25,896 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:25,897 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:25,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:25,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1101753362, now seen corresponding path program 1 times [2022-03-18 13:00:25,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:25,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867470887] [2022-03-18 13:00:25,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:25,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:25,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:25,980 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:25,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:25,984 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:25,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:25,988 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 13:00:25,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:25,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867470887] [2022-03-18 13:00:25,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867470887] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:25,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579037055] [2022-03-18 13:00:25,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:25,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:25,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:25,990 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:00:26,020 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 13:00:26,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:26,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 13:00:26,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:26,522 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 13:00:26,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:26,692 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 13:00:26,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579037055] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:26,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:26,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:00:26,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394190556] [2022-03-18 13:00:26,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:26,693 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:26,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:26,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:26,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:00:26,694 INFO L87 Difference]: Start difference. First operand 53 states and 67 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:00:28,733 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 13:00:30,905 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:33,023 WARN L534 Checker$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 13:00:35,141 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:37,266 WARN L534 Checker$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 13:00:39,384 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:41,563 WARN L534 Checker$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 13:00:43,686 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:45,875 WARN L534 Checker$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 13:00:48,050 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:48,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:00:48,258 INFO L93 Difference]: Finished difference Result 67 states and 86 transitions. [2022-03-18 13:00:48,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:00:48,259 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 13:00:48,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:00:48,260 INFO L225 Difference]: With dead ends: 67 [2022-03-18 13:00:48,260 INFO L226 Difference]: Without dead ends: 65 [2022-03-18 13:00:48,260 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 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 13:00:48,260 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:00:48,261 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-03-18 13:00:48,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-18 13:00:48,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-18 13:00:48,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 51 states have (on average 1.392156862745098) internal successors, (71), 51 states have internal predecessors, (71), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 13:00:48,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 84 transitions. [2022-03-18 13:00:48,272 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 84 transitions. Word has length 25 [2022-03-18 13:00:48,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:00:48,273 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 84 transitions. [2022-03-18 13:00:48,273 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 13:00:48,274 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 84 transitions. [2022-03-18 13:00:48,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-18 13:00:48,274 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:00:48,275 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 13:00:48,295 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 13:00:48,496 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:48,496 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:00:48,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:00:48,496 INFO L85 PathProgramCache]: Analyzing trace with hash 1147898952, now seen corresponding path program 1 times [2022-03-18 13:00:48,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:00:48,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088121679] [2022-03-18 13:00:48,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:48,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:00:48,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:48,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:00:48,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:48,548 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:00:48,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:48,554 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 13:00:48,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:00:48,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088121679] [2022-03-18 13:00:48,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088121679] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:48,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986984289] [2022-03-18 13:00:48,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:00:48,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:00:48,554 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:00:48,555 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 13:00:48,556 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 13:00:48,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:00:48,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 13:00:48,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:00:49,077 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 13:00:49,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:00:49,202 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 13:00:49,202 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986984289] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:00:49,202 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:00:49,202 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:00:49,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290408557] [2022-03-18 13:00:49,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:00:49,202 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:00:49,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:00:49,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:00:49,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:00:49,203 INFO L87 Difference]: Start difference. First operand 65 states and 84 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:00:51,240 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 13:00:53,413 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:55,523 WARN L534 Checker$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 13:00:57,653 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:00:59,704 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:01,812 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:03,987 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:06,104 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:08,284 WARN L534 Checker$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 13:01:10,396 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 13:01:10,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:01:10,582 INFO L93 Difference]: Finished difference Result 81 states and 107 transitions. [2022-03-18 13:01:10,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:01:10,583 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 13:01:10,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:01:10,584 INFO L225 Difference]: With dead ends: 81 [2022-03-18 13:01:10,584 INFO L226 Difference]: Without dead ends: 79 [2022-03-18 13:01:10,584 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:01:10,585 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:01:10,585 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 9 Unknown, 0 Unchecked, 21.4s Time] [2022-03-18 13:01:10,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-18 13:01:10,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2022-03-18 13:01:10,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 62 states have (on average 1.4193548387096775) internal successors, (88), 62 states have internal predecessors, (88), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-18 13:01:10,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 103 transitions. [2022-03-18 13:01:10,608 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 103 transitions. Word has length 26 [2022-03-18 13:01:10,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:01:10,609 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 103 transitions. [2022-03-18 13:01:10,609 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 13:01:10,609 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 103 transitions. [2022-03-18 13:01:10,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 13:01:10,609 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:01:10,609 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 13:01:10,626 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-18 13:01:10,820 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:10,820 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:01:10,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:01:10,820 INFO L85 PathProgramCache]: Analyzing trace with hash -1573409299, now seen corresponding path program 1 times [2022-03-18 13:01:10,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:01:10,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547553078] [2022-03-18 13:01:10,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:10,821 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:01:10,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:11,037 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:01:11,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:11,061 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:01:11,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:11,076 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 13:01:11,076 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:01:11,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547553078] [2022-03-18 13:01:11,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547553078] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:11,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036887463] [2022-03-18 13:01:11,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:11,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:11,076 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:01:11,077 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 13:01:11,078 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 13:01:11,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:11,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 13:01:11,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:01:11,624 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 13:01:11,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:01:11,840 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 13:01:11,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036887463] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:11,841 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:01:11,841 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 9] total 18 [2022-03-18 13:01:11,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296301280] [2022-03-18 13:01:11,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:01:11,841 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:01:11,841 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:01:11,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:01:11,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:01:11,842 INFO L87 Difference]: Start difference. First operand 78 states and 103 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:01:13,883 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 13:01:16,056 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:18,205 WARN L534 Checker$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 13:01:20,323 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:22,495 WARN L534 Checker$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 13:01:24,613 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:26,937 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:29,133 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 13:01:29,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:01:29,260 INFO L93 Difference]: Finished difference Result 93 states and 124 transitions. [2022-03-18 13:01:29,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:01:29,260 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 13:01:29,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:01:29,261 INFO L225 Difference]: With dead ends: 93 [2022-03-18 13:01:29,261 INFO L226 Difference]: Without dead ends: 91 [2022-03-18 13:01:29,261 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=295, Unknown=0, NotChecked=0, Total=342 [2022-03-18 13:01:29,262 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:01:29,263 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 64 Invalid, 8 Unknown, 0 Unchecked, 17.4s Time] [2022-03-18 13:01:29,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-18 13:01:29,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 79. [2022-03-18 13:01:29,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 63 states have (on average 1.4285714285714286) internal successors, (90), 63 states have internal predecessors, (90), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-18 13:01:29,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 105 transitions. [2022-03-18 13:01:29,273 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 105 transitions. Word has length 27 [2022-03-18 13:01:29,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:01:29,273 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 105 transitions. [2022-03-18 13:01:29,273 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 13:01:29,273 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 105 transitions. [2022-03-18 13:01:29,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 13:01:29,274 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:01:29,274 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 13:01:29,292 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 13:01:29,487 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:29,487 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:01:29,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:01:29,488 INFO L85 PathProgramCache]: Analyzing trace with hash 108526595, now seen corresponding path program 1 times [2022-03-18 13:01:29,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:01:29,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733368816] [2022-03-18 13:01:29,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:29,488 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:01:29,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:29,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:01:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:29,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:01:29,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:29,538 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 13:01:29,538 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:01:29,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733368816] [2022-03-18 13:01:29,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733368816] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:29,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230914339] [2022-03-18 13:01:29,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:29,538 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:29,538 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:01:29,539 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 13:01:29,540 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 13:01:29,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:29,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-18 13:01:29,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:01:30,040 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 13:01:30,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:01:30,198 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 13:01:30,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230914339] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:30,198 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:01:30,199 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 9] total 14 [2022-03-18 13:01:30,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043403956] [2022-03-18 13:01:30,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:01:30,199 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:01:30,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:01:30,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:01:30,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2022-03-18 13:01:30,200 INFO L87 Difference]: Start difference. First operand 79 states and 105 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:01:32,238 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 13:01:34,409 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:36,522 WARN L534 Checker$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 13:01:38,645 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:40,872 WARN L534 Checker$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 13:01:43,285 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.41s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:45,384 WARN L534 Checker$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 13:01:47,589 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:49,697 WARN L534 Checker$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 13:01:49,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:01:49,906 INFO L93 Difference]: Finished difference Result 108 states and 147 transitions. [2022-03-18 13:01:49,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:01:49,906 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 13:01:49,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:01:49,907 INFO L225 Difference]: With dead ends: 108 [2022-03-18 13:01:49,907 INFO L226 Difference]: Without dead ends: 106 [2022-03-18 13:01:49,907 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-18 13:01:49,908 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.7s IncrementalHoareTripleChecker+Time [2022-03-18 13:01:49,908 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 71 Invalid, 9 Unknown, 0 Unchecked, 19.7s Time] [2022-03-18 13:01:49,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-18 13:01:49,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2022-03-18 13:01:49,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 86 states have (on average 1.4651162790697674) internal successors, (126), 86 states have internal predecessors, (126), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-18 13:01:49,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 145 transitions. [2022-03-18 13:01:49,916 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 145 transitions. Word has length 28 [2022-03-18 13:01:49,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:01:49,916 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 145 transitions. [2022-03-18 13:01:49,916 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 13:01:49,916 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 145 transitions. [2022-03-18 13:01:49,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-18 13:01:49,917 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:01:49,917 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:01:49,936 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-18 13:01:50,117 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:50,118 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:01:50,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:01:50,118 INFO L85 PathProgramCache]: Analyzing trace with hash -1795383072, now seen corresponding path program 1 times [2022-03-18 13:01:50,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:01:50,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129912903] [2022-03-18 13:01:50,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:50,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:01:50,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:50,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:01:50,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:50,208 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:01:50,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:50,211 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:01:50,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:50,214 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:01:50,214 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:01:50,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129912903] [2022-03-18 13:01:50,214 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129912903] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:50,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1881599823] [2022-03-18 13:01:50,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:01:50,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:01:50,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:01:50,224 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 13:01:50,228 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 13:01:50,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:01:50,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:01:50,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:01:50,838 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:01:50,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:01:51,086 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-18 13:01:51,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1881599823] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:01:51,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:01:51,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:01:51,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283627329] [2022-03-18 13:01:51,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:01:51,087 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:01:51,087 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:01:51,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:01:51,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:01:51,088 INFO L87 Difference]: Start difference. First operand 106 states and 145 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:01:53,135 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:55,359 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:57,537 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:01:59,705 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:01,891 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:04,062 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:04,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:04,257 INFO L93 Difference]: Finished difference Result 118 states and 160 transitions. [2022-03-18 13:02:04,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:04,263 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 33 [2022-03-18 13:02:04,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:04,264 INFO L225 Difference]: With dead ends: 118 [2022-03-18 13:02:04,264 INFO L226 Difference]: Without dead ends: 116 [2022-03-18 13:02:04,264 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:02:04,265 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:04,265 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 80 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 6 Unknown, 0 Unchecked, 13.1s Time] [2022-03-18 13:02:04,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-03-18 13:02:04,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 97. [2022-03-18 13:02:04,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 79 states have (on average 1.481012658227848) internal successors, (117), 79 states have internal predecessors, (117), 9 states have call successors, (9), 9 states have call predecessors, (9), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 13:02:04,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 134 transitions. [2022-03-18 13:02:04,294 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 134 transitions. Word has length 33 [2022-03-18 13:02:04,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:04,294 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 134 transitions. [2022-03-18 13:02:04,294 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 13:02:04,294 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 134 transitions. [2022-03-18 13:02:04,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-18 13:02:04,295 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:04,295 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:02:04,313 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-03-18 13:02:04,514 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-18 13:02:04,514 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:04,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:04,515 INFO L85 PathProgramCache]: Analyzing trace with hash 1119304443, now seen corresponding path program 1 times [2022-03-18 13:02:04,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:04,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107082302] [2022-03-18 13:02:04,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:04,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:04,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:04,705 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:04,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:04,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:04,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:04,730 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:02:04,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:04,748 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:04,748 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:04,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107082302] [2022-03-18 13:02:04,748 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107082302] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:04,748 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919303881] [2022-03-18 13:02:04,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:04,748 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:04,748 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:04,750 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 13:02:04,764 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 13:02:04,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:04,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:02:04,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:05,433 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:05,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:05,758 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-18 13:02:05,759 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919303881] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:05,759 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:05,759 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:02:05,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463614202] [2022-03-18 13:02:05,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:05,759 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:05,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:05,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:05,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:02:05,760 INFO L87 Difference]: Start difference. First operand 97 states and 134 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:02:07,807 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:09,988 WARN L534 Checker$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 13:02:12,114 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:14,292 WARN L534 Checker$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 13:02:16,473 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:18,646 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.17s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:18,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:18,855 INFO L93 Difference]: Finished difference Result 120 states and 164 transitions. [2022-03-18 13:02:18,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:18,855 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-03-18 13:02:18,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:18,856 INFO L225 Difference]: With dead ends: 120 [2022-03-18 13:02:18,856 INFO L226 Difference]: Without dead ends: 118 [2022-03-18 13:02:18,856 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 58 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:02:18,857 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 13.1s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:18,857 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 6 Unknown, 0 Unchecked, 13.1s Time] [2022-03-18 13:02:18,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-03-18 13:02:18,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 107. [2022-03-18 13:02:18,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 87 states have (on average 1.471264367816092) internal successors, (128), 87 states have internal predecessors, (128), 10 states have call successors, (10), 10 states have call predecessors, (10), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-18 13:02:18,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 147 transitions. [2022-03-18 13:02:18,864 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 147 transitions. Word has length 34 [2022-03-18 13:02:18,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:18,864 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 147 transitions. [2022-03-18 13:02:18,865 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 13:02:18,865 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 147 transitions. [2022-03-18 13:02:18,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-18 13:02:18,865 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:18,865 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 13:02:18,882 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 13:02:19,082 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-18 13:02:19,082 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:19,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:19,082 INFO L85 PathProgramCache]: Analyzing trace with hash 1140859003, now seen corresponding path program 1 times [2022-03-18 13:02:19,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:19,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658584754] [2022-03-18 13:02:19,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:19,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:19,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:19,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:19,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:19,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:19,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:19,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:02:19,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:19,185 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 13:02:19,185 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:19,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658584754] [2022-03-18 13:02:19,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658584754] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:19,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352964149] [2022-03-18 13:02:19,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:19,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:19,185 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:19,186 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 13:02:19,188 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 13:02:19,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:19,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:02:19,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:19,851 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 13:02:19,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:20,060 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 13:02:20,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352964149] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:20,061 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:20,061 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:02:20,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775044075] [2022-03-18 13:02:20,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:20,063 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:20,063 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:20,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:20,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:02:20,064 INFO L87 Difference]: Start difference. First operand 107 states and 147 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:02:22,104 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:24,319 WARN L534 Checker$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 13:02:26,494 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:28,666 WARN L534 Checker$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 13:02:30,856 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:32,970 WARN L534 Checker$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 13:02:35,159 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 13:02:35,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:35,292 INFO L93 Difference]: Finished difference Result 141 states and 192 transitions. [2022-03-18 13:02:35,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:35,293 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 13:02:35,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:35,293 INFO L225 Difference]: With dead ends: 141 [2022-03-18 13:02:35,293 INFO L226 Difference]: Without dead ends: 139 [2022-03-18 13:02:35,294 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:02:35,294 INFO L912 BasicCegarLoop]: 18 mSDtfsCounter, 5 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:35,294 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 74 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 7 Unknown, 0 Unchecked, 15.2s Time] [2022-03-18 13:02:35,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-03-18 13:02:35,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2022-03-18 13:02:35,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 113 states have (on average 1.4601769911504425) internal successors, (165), 113 states have internal predecessors, (165), 13 states have call successors, (13), 13 states have call predecessors, (13), 12 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-18 13:02:35,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 190 transitions. [2022-03-18 13:02:35,303 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 190 transitions. Word has length 35 [2022-03-18 13:02:35,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:35,303 INFO L478 AbstractCegarLoop]: Abstraction has 139 states and 190 transitions. [2022-03-18 13:02:35,303 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 13:02:35,303 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 190 transitions. [2022-03-18 13:02:35,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-18 13:02:35,304 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:35,304 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:02:35,321 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 13:02:35,520 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-18 13:02:35,521 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:35,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:35,521 INFO L85 PathProgramCache]: Analyzing trace with hash 228128645, now seen corresponding path program 1 times [2022-03-18 13:02:35,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:35,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912690813] [2022-03-18 13:02:35,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:35,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:35,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:35,565 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:35,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:35,568 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:35,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:35,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2022-03-18 13:02:35,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:35,573 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:02:35,573 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:35,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912690813] [2022-03-18 13:02:35,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912690813] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:35,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [156153957] [2022-03-18 13:02:35,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:35,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:35,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:35,574 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 13:02:35,575 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 13:02:35,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:35,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:02:35,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:36,106 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:02:36,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:36,359 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-18 13:02:36,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [156153957] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:36,359 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:36,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:02:36,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645980105] [2022-03-18 13:02:36,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:36,360 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:36,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:36,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:36,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:02:36,360 INFO L87 Difference]: Start difference. First operand 139 states and 190 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:02:38,387 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 13:02:40,579 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:42,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:44,892 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:47,002 WARN L534 Checker$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 13:02:49,191 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:02:51,304 WARN L534 Checker$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 13:02:53,493 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 13:02:53,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:02:53,621 INFO L93 Difference]: Finished difference Result 155 states and 213 transitions. [2022-03-18 13:02:53,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:02:53,622 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2022-03-18 13:02:53,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:02:53,623 INFO L225 Difference]: With dead ends: 155 [2022-03-18 13:02:53,623 INFO L226 Difference]: Without dead ends: 153 [2022-03-18 13:02:53,624 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:02:53,624 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-18 13:02:53,624 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 8 Unknown, 0 Unchecked, 17.2s Time] [2022-03-18 13:02:53,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2022-03-18 13:02:53,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2022-03-18 13:02:53,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 124 states have (on average 1.467741935483871) internal successors, (182), 124 states have internal predecessors, (182), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-18 13:02:53,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 209 transitions. [2022-03-18 13:02:53,656 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 209 transitions. Word has length 35 [2022-03-18 13:02:53,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:02:53,656 INFO L478 AbstractCegarLoop]: Abstraction has 152 states and 209 transitions. [2022-03-18 13:02:53,656 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 13:02:53,656 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 209 transitions. [2022-03-18 13:02:53,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 13:02:53,657 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:02:53,657 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 13:02:53,673 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 13:02:53,873 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-18 13:02:53,873 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:02:53,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:02:53,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1934793473, now seen corresponding path program 1 times [2022-03-18 13:02:53,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:02:53,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178678563] [2022-03-18 13:02:53,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:53,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:02:53,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:53,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:02:53,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:53,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:02:53,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:53,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:02:53,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:53,975 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 13:02:53,976 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:02:53,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178678563] [2022-03-18 13:02:53,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178678563] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:53,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353511818] [2022-03-18 13:02:53,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:02:53,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:02:53,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:02:53,978 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 13:02:53,979 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 13:02:54,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:02:54,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:02:54,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:02:54,618 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 13:02:54,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:02:54,803 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 13:02:54,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353511818] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:02:54,803 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:02:54,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:02:54,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458485359] [2022-03-18 13:02:54,803 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:02:54,803 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:02:54,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:02:54,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:02:54,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:02:54,804 INFO L87 Difference]: Start difference. First operand 152 states and 209 transitions. Second operand has 6 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 5 states have internal predecessors, (19), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:02:56,838 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 13:02:59,005 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:01,122 WARN L534 Checker$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 13:03:03,302 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:05,424 WARN L534 Checker$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 13:03:07,611 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:09,735 WARN L534 Checker$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 13:03:09,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:09,919 INFO L93 Difference]: Finished difference Result 168 states and 232 transitions. [2022-03-18 13:03:09,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:09,920 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 13:03:09,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:09,920 INFO L225 Difference]: With dead ends: 168 [2022-03-18 13:03:09,921 INFO L226 Difference]: Without dead ends: 166 [2022-03-18 13:03:09,921 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 64 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:03:09,921 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.1s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:09,921 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 7 Unknown, 0 Unchecked, 15.1s Time] [2022-03-18 13:03:09,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-03-18 13:03:09,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2022-03-18 13:03:09,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 135 states have (on average 1.474074074074074) internal successors, (199), 135 states have internal predecessors, (199), 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 13:03:09,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 228 transitions. [2022-03-18 13:03:09,930 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 228 transitions. Word has length 36 [2022-03-18 13:03:09,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:09,930 INFO L478 AbstractCegarLoop]: Abstraction has 165 states and 228 transitions. [2022-03-18 13:03:09,930 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 13:03:09,930 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 228 transitions. [2022-03-18 13:03:09,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 13:03:09,930 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:09,930 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:03:09,948 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-18 13:03:10,146 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-18 13:03:10,147 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:10,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:10,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1614274432, now seen corresponding path program 1 times [2022-03-18 13:03:10,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:10,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180757999] [2022-03-18 13:03:10,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:10,147 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:10,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:10,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:10,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:10,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:10,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:10,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 13:03:10,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:03:10,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:10,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180757999] [2022-03-18 13:03:10,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180757999] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:10,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779960267] [2022-03-18 13:03:10,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:10,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:10,423 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:10,436 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 13:03:10,437 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 13:03:10,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:10,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:03:10,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:11,097 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:03:11,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:11,373 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-18 13:03:11,373 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779960267] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:11,373 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:11,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:03:11,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838108311] [2022-03-18 13:03:11,374 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:11,374 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:11,374 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:11,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:11,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:03:11,374 INFO L87 Difference]: Start difference. First operand 165 states and 228 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 13:03:13,417 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:15,603 WARN L534 Checker$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 13:03:17,719 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:19,892 WARN L534 Checker$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 13:03:22,008 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:24,124 WARN L534 Checker$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 13:03:26,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:28,364 WARN L534 Checker$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 13:03:30,593 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 13:03:30,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:30,782 INFO L93 Difference]: Finished difference Result 180 states and 249 transitions. [2022-03-18 13:03:30,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:30,783 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2022-03-18 13:03:30,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:30,784 INFO L225 Difference]: With dead ends: 180 [2022-03-18 13:03:30,784 INFO L226 Difference]: Without dead ends: 178 [2022-03-18 13:03:30,784 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 62 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:03:30,785 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:30,785 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 64 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 9 Unknown, 0 Unchecked, 19.4s Time] [2022-03-18 13:03:30,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-03-18 13:03:30,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 153. [2022-03-18 13:03:30,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 125 states have (on average 1.472) internal successors, (184), 125 states have internal predecessors, (184), 14 states have call successors, (14), 14 states have call predecessors, (14), 13 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-18 13:03:30,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 211 transitions. [2022-03-18 13:03:30,797 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 211 transitions. Word has length 36 [2022-03-18 13:03:30,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:30,797 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 211 transitions. [2022-03-18 13:03:30,797 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 13:03:30,797 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 211 transitions. [2022-03-18 13:03:30,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 13:03:30,798 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:30,798 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] [2022-03-18 13:03:30,814 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 13:03:31,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-18 13:03:31,011 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:31,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:31,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1647373334, now seen corresponding path program 1 times [2022-03-18 13:03:31,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:31,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161873105] [2022-03-18 13:03:31,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:31,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:31,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:31,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:31,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:31,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:31,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:31,253 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:03:31,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:31,260 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 13:03:31,260 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:31,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161873105] [2022-03-18 13:03:31,260 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161873105] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:31,260 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26555589] [2022-03-18 13:03:31,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:31,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:31,261 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:31,269 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 13:03:31,311 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 13:03:31,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:31,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:03:31,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:32,059 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 13:03:32,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:32,338 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 13:03:32,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26555589] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:32,339 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:32,339 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:03:32,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126845646] [2022-03-18 13:03:32,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:32,339 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:32,340 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:32,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:32,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:03:32,340 INFO L87 Difference]: Start difference. First operand 153 states and 211 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:03:34,383 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 13:03:36,564 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:38,702 WARN L534 Checker$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 13:03:40,878 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:42,995 WARN L534 Checker$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 13:03:45,111 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:47,351 WARN L534 Checker$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 13:03:49,536 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 13:03:49,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:03:49,674 INFO L93 Difference]: Finished difference Result 181 states and 251 transitions. [2022-03-18 13:03:49,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:03:49,674 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-03-18 13:03:49,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:03:49,675 INFO L225 Difference]: With dead ends: 181 [2022-03-18 13:03:49,675 INFO L226 Difference]: Without dead ends: 179 [2022-03-18 13:03:49,676 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 65 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2022-03-18 13:03:49,676 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:03:49,676 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 63 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-18 13:03:49,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-03-18 13:03:49,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 167. [2022-03-18 13:03:49,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 137 states have (on average 1.4817518248175183) internal successors, (203), 137 states have internal predecessors, (203), 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 13:03:49,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 232 transitions. [2022-03-18 13:03:49,685 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 232 transitions. Word has length 37 [2022-03-18 13:03:49,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:03:49,685 INFO L478 AbstractCegarLoop]: Abstraction has 167 states and 232 transitions. [2022-03-18 13:03:49,685 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 13:03:49,685 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 232 transitions. [2022-03-18 13:03:49,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 13:03:49,685 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:03:49,685 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 13:03:49,704 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-18 13:03:49,886 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:49,890 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:03:49,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:03:49,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1832857340, now seen corresponding path program 1 times [2022-03-18 13:03:49,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:03:49,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119593542] [2022-03-18 13:03:49,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:49,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:03:49,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:49,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:03:49,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:49,947 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:03:49,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:49,950 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:03:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:49,953 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 13:03:49,953 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:03:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119593542] [2022-03-18 13:03:49,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119593542] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:49,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1226847882] [2022-03-18 13:03:49,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:03:49,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:03:49,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:03:49,954 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 13:03:49,955 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 13:03:49,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:03:49,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:03:49,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:03:50,637 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 13:03:50,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:03:50,883 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 13:03:50,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1226847882] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:03:50,883 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:03:50,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:03:50,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400687740] [2022-03-18 13:03:50,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:03:50,884 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:03:50,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:03:50,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:03:50,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:03:50,884 INFO L87 Difference]: Start difference. First operand 167 states and 232 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 13:03:52,923 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 13:03:55,139 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:57,251 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:03:59,410 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:01,596 WARN L534 Checker$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 13:04:03,786 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:05,911 WARN L534 Checker$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 13:04:08,035 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:10,163 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:10,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:10,365 INFO L93 Difference]: Finished difference Result 182 states and 253 transitions. [2022-03-18 13:04:10,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:10,365 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 13:04:10,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:10,366 INFO L225 Difference]: With dead ends: 182 [2022-03-18 13:04:10,366 INFO L226 Difference]: Without dead ends: 180 [2022-03-18 13:04:10,366 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 66 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 13:04:10,367 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:10,367 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 62 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 9 Unknown, 0 Unchecked, 19.5s Time] [2022-03-18 13:04:10,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-03-18 13:04:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2022-03-18 13:04:10,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 147 states have (on average 1.4829931972789117) internal successors, (218), 147 states have internal predecessors, (218), 16 states have call successors, (16), 16 states have call predecessors, (16), 15 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-18 13:04:10,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 249 transitions. [2022-03-18 13:04:10,377 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 249 transitions. Word has length 37 [2022-03-18 13:04:10,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:10,377 INFO L478 AbstractCegarLoop]: Abstraction has 179 states and 249 transitions. [2022-03-18 13:04:10,377 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 13:04:10,377 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 249 transitions. [2022-03-18 13:04:10,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-18 13:04:10,377 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:10,377 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:04:10,395 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 13:04:10,586 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-18 13:04:10,586 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:10,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:10,586 INFO L85 PathProgramCache]: Analyzing trace with hash 582945322, now seen corresponding path program 1 times [2022-03-18 13:04:10,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:10,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364851710] [2022-03-18 13:04:10,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:10,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:10,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:10,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:10,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:10,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:10,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:10,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-03-18 13:04:10,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:10,640 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:04:10,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:10,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364851710] [2022-03-18 13:04:10,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364851710] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:10,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137653996] [2022-03-18 13:04:10,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:10,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:10,640 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:10,653 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 13:04:10,654 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 13:04:10,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:10,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:04:10,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:04:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:04:11,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:04:11,561 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-18 13:04:11,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137653996] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:11,561 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:04:11,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:04:11,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335016599] [2022-03-18 13:04:11,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:04:11,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:04:11,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:04:11,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:04:11,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:04:11,562 INFO L87 Difference]: Start difference. First operand 179 states and 249 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:04:13,602 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:15,791 WARN L534 Checker$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 13:04:17,913 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:20,089 WARN L534 Checker$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 13:04:22,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:24,443 WARN L534 Checker$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 13:04:26,560 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:28,745 WARN L534 Checker$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 13:04:28,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:28,885 INFO L93 Difference]: Finished difference Result 208 states and 291 transitions. [2022-03-18 13:04:28,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:28,886 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-03-18 13:04:28,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:28,886 INFO L225 Difference]: With dead ends: 208 [2022-03-18 13:04:28,887 INFO L226 Difference]: Without dead ends: 206 [2022-03-18 13:04:28,887 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:04:28,887 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:28,887 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-18 13:04:28,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-03-18 13:04:28,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 192. [2022-03-18 13:04:28,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 158 states have (on average 1.4873417721518987) internal successors, (235), 158 states have internal predecessors, (235), 17 states have call successors, (17), 17 states have call predecessors, (17), 16 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-18 13:04:28,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 268 transitions. [2022-03-18 13:04:28,897 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 268 transitions. Word has length 37 [2022-03-18 13:04:28,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:28,897 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 268 transitions. [2022-03-18 13:04:28,897 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 13:04:28,897 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 268 transitions. [2022-03-18 13:04:28,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 13:04:28,898 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:28,898 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 13:04:28,916 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 13:04:29,111 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 13:04:29,112 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:29,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:29,112 INFO L85 PathProgramCache]: Analyzing trace with hash 1168540410, now seen corresponding path program 1 times [2022-03-18 13:04:29,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:29,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007779654] [2022-03-18 13:04:29,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:29,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:29,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:29,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:29,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:29,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:29,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:29,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:04:29,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:29,315 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 13:04:29,315 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:29,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007779654] [2022-03-18 13:04:29,315 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007779654] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:29,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522382422] [2022-03-18 13:04:29,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:29,316 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:29,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:29,317 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 13:04:29,318 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 13:04:29,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:29,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:04:29,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:04:30,045 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 13:04:30,046 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:04:30,300 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 13:04:30,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522382422] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:30,301 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:04:30,301 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9, 11] total 20 [2022-03-18 13:04:30,301 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001378102] [2022-03-18 13:04:30,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:04:30,301 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:04:30,301 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:04:30,302 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:04:30,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=323, Unknown=0, NotChecked=0, Total=380 [2022-03-18 13:04:30,302 INFO L87 Difference]: Start difference. First operand 192 states and 268 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 13:04:32,347 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:34,526 WARN L534 Checker$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 13:04:36,642 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:38,776 WARN L534 Checker$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 13:04:41,005 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:43,113 WARN L534 Checker$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 13:04:45,371 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:47,486 WARN L534 Checker$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 13:04:47,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:04:47,719 INFO L93 Difference]: Finished difference Result 235 states and 331 transitions. [2022-03-18 13:04:47,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:04:47,731 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 13:04:47,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:04:47,733 INFO L225 Difference]: With dead ends: 235 [2022-03-18 13:04:47,733 INFO L226 Difference]: Without dead ends: 233 [2022-03-18 13:04:47,734 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 67 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 13:04:47,736 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.4s IncrementalHoareTripleChecker+Time [2022-03-18 13:04:47,736 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 56 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 8 Unknown, 0 Unchecked, 17.4s Time] [2022-03-18 13:04:47,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-03-18 13:04:47,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 233. [2022-03-18 13:04:47,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 193 states have (on average 1.5025906735751295) internal successors, (290), 193 states have internal predecessors, (290), 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 13:04:47,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 329 transitions. [2022-03-18 13:04:47,746 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 329 transitions. Word has length 38 [2022-03-18 13:04:47,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:04:47,746 INFO L478 AbstractCegarLoop]: Abstraction has 233 states and 329 transitions. [2022-03-18 13:04:47,747 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 13:04:47,747 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 329 transitions. [2022-03-18 13:04:47,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 13:04:47,748 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:04:47,748 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 13:04:47,771 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 13:04:47,964 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 13:04:47,965 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:04:47,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:04:47,966 INFO L85 PathProgramCache]: Analyzing trace with hash 512426161, now seen corresponding path program 1 times [2022-03-18 13:04:47,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:04:47,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77050021] [2022-03-18 13:04:47,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:47,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:04:47,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:48,052 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:04:48,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:48,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:04:48,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:48,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:04:48,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:48,066 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 13:04:48,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:04:48,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77050021] [2022-03-18 13:04:48,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77050021] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:48,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898458934] [2022-03-18 13:04:48,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:04:48,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:04:48,066 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:04:48,080 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 13:04:48,081 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 13:04:48,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:04:48,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:04:48,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:04:48,799 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 13:04:48,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:04:49,006 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 13:04:49,006 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898458934] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:04:49,006 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:04:49,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:04:49,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313587359] [2022-03-18 13:04:49,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:04:49,007 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:04:49,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:04:49,007 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:04:49,007 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:04:49,007 INFO L87 Difference]: Start difference. First operand 233 states and 329 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 13:04:51,045 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:53,238 WARN L534 Checker$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 13:04:55,369 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:04:57,494 WARN L534 Checker$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 13:04:59,623 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:01,811 WARN L534 Checker$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 13:05:04,026 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:06,219 WARN L534 Checker$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 13:05:08,354 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 13:05:08,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:05:08,504 INFO L93 Difference]: Finished difference Result 248 states and 350 transitions. [2022-03-18 13:05:08,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:05:08,504 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 13:05:08,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:05:08,505 INFO L225 Difference]: With dead ends: 248 [2022-03-18 13:05:08,505 INFO L226 Difference]: Without dead ends: 246 [2022-03-18 13:05:08,506 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:05:08,506 INFO L912 BasicCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 2 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 18.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 19.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:05:08,506 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 62 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 68 Invalid, 9 Unknown, 0 Unchecked, 19.5s Time] [2022-03-18 13:05:08,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2022-03-18 13:05:08,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 209. [2022-03-18 13:05:08,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 173 states have (on average 1.5028901734104045) internal successors, (260), 173 states have internal predecessors, (260), 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 13:05:08,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 295 transitions. [2022-03-18 13:05:08,515 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 295 transitions. Word has length 38 [2022-03-18 13:05:08,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:05:08,516 INFO L478 AbstractCegarLoop]: Abstraction has 209 states and 295 transitions. [2022-03-18 13:05:08,516 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 13:05:08,516 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 295 transitions. [2022-03-18 13:05:08,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 13:05:08,516 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:05:08,516 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 13:05:08,533 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-03-18 13:05:08,731 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:08,731 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:05:08,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:05:08,732 INFO L85 PathProgramCache]: Analyzing trace with hash 344916415, now seen corresponding path program 1 times [2022-03-18 13:05:08,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:05:08,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217872700] [2022-03-18 13:05:08,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:08,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:05:08,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:08,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:05:08,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:08,812 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:05:08,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:08,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-18 13:05:08,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:08,819 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 13:05:08,819 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:05:08,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217872700] [2022-03-18 13:05:08,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [217872700] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:08,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290439678] [2022-03-18 13:05:08,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:08,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:08,820 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:05:08,824 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 13:05:08,868 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-18 13:05:08,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:08,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:05:08,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:05:09,637 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 13:05:09,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:05:09,860 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 13:05:09,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290439678] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:09,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:05:09,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [5, 11] total 16 [2022-03-18 13:05:09,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843901304] [2022-03-18 13:05:09,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:05:09,861 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:05:09,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:05:09,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:05:09,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-03-18 13:05:09,862 INFO L87 Difference]: Start difference. First operand 209 states and 295 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 13:05:11,902 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 13:05:14,071 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:16,176 WARN L534 Checker$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 13:05:18,293 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:20,407 WARN L534 Checker$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 13:05:22,526 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:24,699 WARN L534 Checker$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 13:05:26,889 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:29,017 WARN L534 Checker$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 13:05:31,229 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 13:05:31,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:05:31,361 INFO L93 Difference]: Finished difference Result 238 states and 337 transitions. [2022-03-18 13:05:31,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:05:31,361 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 13:05:31,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:05:31,362 INFO L225 Difference]: With dead ends: 238 [2022-03-18 13:05:31,362 INFO L226 Difference]: Without dead ends: 236 [2022-03-18 13:05:31,362 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 70 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:05:31,362 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.5s IncrementalHoareTripleChecker+Time [2022-03-18 13:05:31,363 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 58 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 10 Unknown, 0 Unchecked, 21.5s Time] [2022-03-18 13:05:31,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2022-03-18 13:05:31,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 236. [2022-03-18 13:05:31,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 236 states, 196 states have (on average 1.510204081632653) internal successors, (296), 196 states have internal predecessors, (296), 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 13:05:31,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 335 transitions. [2022-03-18 13:05:31,372 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 335 transitions. Word has length 39 [2022-03-18 13:05:31,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:05:31,372 INFO L478 AbstractCegarLoop]: Abstraction has 236 states and 335 transitions. [2022-03-18 13:05:31,372 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 13:05:31,372 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 335 transitions. [2022-03-18 13:05:31,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-18 13:05:31,373 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:05:31,373 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:05:31,389 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-18 13:05:31,588 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:31,589 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:05:31,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:05:31,589 INFO L85 PathProgramCache]: Analyzing trace with hash 617179226, now seen corresponding path program 1 times [2022-03-18 13:05:31,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:05:31,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055403606] [2022-03-18 13:05:31,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:31,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:05:31,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:31,644 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:05:31,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:31,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:05:31,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:31,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-18 13:05:31,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:31,651 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-18 13:05:31,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:05:31,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055403606] [2022-03-18 13:05:31,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055403606] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:31,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356656313] [2022-03-18 13:05:31,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:31,652 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:31,652 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:05:31,656 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:05:31,657 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-18 13:05:31,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:31,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-18 13:05:31,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 13:05:32,412 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 13:05:32,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 13:05:32,708 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-18 13:05:32,708 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356656313] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:32,709 INFO L184 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2022-03-18 13:05:32,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 11] total 17 [2022-03-18 13:05:32,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283863543] [2022-03-18 13:05:32,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 13:05:32,709 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 13:05:32,709 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-18 13:05:32,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 13:05:32,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-03-18 13:05:32,710 INFO L87 Difference]: Start difference. First operand 236 states and 335 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 13:05:34,766 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 13:05:36,944 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:39,084 WARN L534 Checker$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 13:05:41,200 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:43,324 WARN L534 Checker$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 13:05:45,506 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 13:05:47,620 WARN L534 Checker$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 13:05:49,810 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 13:05:50,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 13:05:50,053 INFO L93 Difference]: Finished difference Result 252 states and 358 transitions. [2022-03-18 13:05:50,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 13:05:50,055 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 41 [2022-03-18 13:05:50,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 13:05:50,056 INFO L225 Difference]: With dead ends: 252 [2022-03-18 13:05:50,056 INFO L226 Difference]: Without dead ends: 250 [2022-03-18 13:05:50,056 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 73 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2022-03-18 13:05:50,057 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 5 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 2 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.3s IncrementalHoareTripleChecker+Time [2022-03-18 13:05:50,057 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 57 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 75 Invalid, 8 Unknown, 0 Unchecked, 17.3s Time] [2022-03-18 13:05:50,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-03-18 13:05:50,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 250. [2022-03-18 13:05:50,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 250 states, 208 states have (on average 1.5144230769230769) internal successors, (315), 208 states have internal predecessors, (315), 21 states have call successors, (21), 21 states have call predecessors, (21), 20 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-18 13:05:50,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 250 states to 250 states and 356 transitions. [2022-03-18 13:05:50,070 INFO L78 Accepts]: Start accepts. Automaton has 250 states and 356 transitions. Word has length 41 [2022-03-18 13:05:50,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 13:05:50,070 INFO L478 AbstractCegarLoop]: Abstraction has 250 states and 356 transitions. [2022-03-18 13:05:50,070 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 13:05:50,070 INFO L276 IsEmpty]: Start isEmpty. Operand 250 states and 356 transitions. [2022-03-18 13:05:50,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-18 13:05:50,071 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 13:05:50,071 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 13:05:50,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-18 13:05:50,287 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-18 13:05:50,287 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 13:05:50,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 13:05:50,288 INFO L85 PathProgramCache]: Analyzing trace with hash 1955359922, now seen corresponding path program 1 times [2022-03-18 13:05:50,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 13:05:50,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253971672] [2022-03-18 13:05:50,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:50,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 13:05:50,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 13:05:50,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,482 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2022-03-18 13:05:50,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2022-03-18 13:05:50,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-03-18 13:05:50,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 13:05:50,519 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 13:05:50,519 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 13:05:50,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253971672] [2022-03-18 13:05:50,519 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253971672] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-18 13:05:50,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189299839] [2022-03-18 13:05:50,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 13:05:50,519 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 13:05:50,520 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 13:05:50,536 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 13:05:50,544 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process