/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound20.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 02:11:38,381 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 02:11:38,382 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 02:11:38,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 02:11:38,474 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 02:11:38,475 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 02:11:38,478 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 02:11:38,478 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 02:11:38,493 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 02:11:38,494 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 02:11:38,496 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 02:11:38,496 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 02:11:38,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 02:11:38,496 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 02:11:38,496 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 02:11:38,496 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 02:11:38,497 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 02:11:38,497 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 02:11:38,497 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 02:11:38,498 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 02:11:38,498 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 02:11:38,498 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 02:11:38,498 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 02:11:38,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 02:11:38,498 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 02:11:38,498 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 02:11:38,499 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 02:11:38,499 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 02:11:38,499 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 02:11:38,499 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 02:11:38,499 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 02:11:38,722 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 02:11:38,742 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 02:11:38,744 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 02:11:38,745 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 02:11:38,750 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 02:11:38,751 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound20.i [2022-03-18 02:11:38,822 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9c08536c/e31d7efd041f457384c523ccb0564b0a/FLAG0dd5d5992 [2022-03-18 02:11:39,165 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 02:11:39,166 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound20.i [2022-03-18 02:11:39,171 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9c08536c/e31d7efd041f457384c523ccb0564b0a/FLAG0dd5d5992 [2022-03-18 02:11:39,593 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9c08536c/e31d7efd041f457384c523ccb0564b0a [2022-03-18 02:11:39,595 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 02:11:39,597 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 02:11:39,603 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 02:11:39,604 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 02:11:39,607 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 02:11:39,607 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,608 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c728bfb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39, skipping insertion in model container [2022-03-18 02:11:39,608 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,616 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 02:11:39,628 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 02:11:39,779 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound20.i[951,964] [2022-03-18 02:11:39,799 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 02:11:39,807 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 02:11:39,823 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_unwindbound20.i[951,964] [2022-03-18 02:11:39,839 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 02:11:39,852 INFO L208 MainTranslator]: Completed translation [2022-03-18 02:11:39,853 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39 WrapperNode [2022-03-18 02:11:39,853 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 02:11:39,854 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 02:11:39,854 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 02:11:39,855 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 02:11:39,866 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,874 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,875 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,886 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,892 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,898 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 02:11:39,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 02:11:39,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 02:11:39,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 02:11:39,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (1/1) ... [2022-03-18 02:11:39,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 02:11:39,919 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:39,932 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 02:11:39,960 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 02:11:39,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 02:11:39,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 02:11:39,976 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 02:11:39,976 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 02:11:39,977 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 02:11:39,977 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 02:11:39,977 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 02:11:39,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-18 02:11:39,978 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 02:11:39,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 02:11:39,979 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 02:11:39,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 02:11:39,979 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 02:11:39,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 02:11:39,979 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 02:11:39,980 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 02:11:39,980 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 02:11:40,056 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 02:11:40,057 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 02:11:40,164 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 02:11:40,170 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 02:11:40,170 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-18 02:11:40,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 02:11:40 BoogieIcfgContainer [2022-03-18 02:11:40,171 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 02:11:40,173 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 02:11:40,173 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 02:11:40,197 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 02:11:40,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 02:11:39" (1/3) ... [2022-03-18 02:11:40,198 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75c9b67b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 02:11:40, skipping insertion in model container [2022-03-18 02:11:40,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 02:11:39" (2/3) ... [2022-03-18 02:11:40,199 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75c9b67b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 02:11:40, skipping insertion in model container [2022-03-18 02:11:40,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 02:11:40" (3/3) ... [2022-03-18 02:11:40,200 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_unwindbound20.i [2022-03-18 02:11:40,204 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 02:11:40,205 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 02:11:40,272 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 02:11:40,278 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 02:11:40,279 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 02:11:40,302 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 02:11:40,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-18 02:11:40,309 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:40,309 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:40,310 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:40,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:40,318 INFO L85 PathProgramCache]: Analyzing trace with hash -2126508982, now seen corresponding path program 1 times [2022-03-18 02:11:40,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:40,325 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1307720864] [2022-03-18 02:11:40,336 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 02:11:40,336 INFO L85 PathProgramCache]: Analyzing trace with hash -2126508982, now seen corresponding path program 2 times [2022-03-18 02:11:40,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:40,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328514632] [2022-03-18 02:11:40,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:40,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:40,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:40,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 02:11:40,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:40,543 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 02:11:40,543 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:40,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328514632] [2022-03-18 02:11:40,544 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328514632] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:40,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:40,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:40,547 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:40,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1307720864] [2022-03-18 02:11:40,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1307720864] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:40,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:40,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:40,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207302700] [2022-03-18 02:11:40,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:40,555 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 02:11:40,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:40,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 02:11:40,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 02:11:40,585 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states 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 02:11:40,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:40,671 INFO L93 Difference]: Finished difference Result 44 states and 60 transitions. [2022-03-18 02:11:40,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 02:11:40,673 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 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 12 [2022-03-18 02:11:40,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:40,688 INFO L225 Difference]: With dead ends: 44 [2022-03-18 02:11:40,689 INFO L226 Difference]: Without dead ends: 22 [2022-03-18 02:11:40,692 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 02:11:40,695 INFO L912 BasicCegarLoop]: 30 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:40,697 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 34 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:40,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-18 02:11:40,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2022-03-18 02:11:40,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:11:40,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-03-18 02:11:40,745 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 12 [2022-03-18 02:11:40,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:40,745 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-03-18 02:11:40,746 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states 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 02:11:40,746 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-03-18 02:11:40,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-18 02:11:40,747 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:40,747 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:40,747 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 02:11:40,748 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:40,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:40,749 INFO L85 PathProgramCache]: Analyzing trace with hash 941422680, now seen corresponding path program 1 times [2022-03-18 02:11:40,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:40,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1975685618] [2022-03-18 02:11:40,751 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 02:11:40,752 INFO L85 PathProgramCache]: Analyzing trace with hash 941422680, now seen corresponding path program 2 times [2022-03-18 02:11:40,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:40,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994803857] [2022-03-18 02:11:40,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:40,753 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:40,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:40,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 02:11:40,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:40,870 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 02:11:40,870 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:40,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994803857] [2022-03-18 02:11:40,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994803857] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:40,871 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:40,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 02:11:40,872 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:40,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1975685618] [2022-03-18 02:11:40,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1975685618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:40,872 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:40,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 02:11:40,872 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276149795] [2022-03-18 02:11:40,873 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:40,873 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 02:11:40,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:40,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 02:11:40,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 02:11:40,875 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:40,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:40,967 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2022-03-18 02:11:40,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 02:11:40,967 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-18 02:11:40,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:40,970 INFO L225 Difference]: With dead ends: 35 [2022-03-18 02:11:40,970 INFO L226 Difference]: Without dead ends: 23 [2022-03-18 02:11:40,974 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 02:11:40,976 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 6 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:40,980 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 53 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:40,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-18 02:11:40,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-18 02:11:40,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:11:40,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2022-03-18 02:11:40,986 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 14 [2022-03-18 02:11:40,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:40,987 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2022-03-18 02:11:40,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:40,987 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2022-03-18 02:11:40,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 02:11:40,988 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:40,988 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:40,988 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 02:11:40,988 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:40,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:40,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1209133518, now seen corresponding path program 1 times [2022-03-18 02:11:40,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:40,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1071609343] [2022-03-18 02:11:40,989 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 02:11:40,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1209133518, now seen corresponding path program 2 times [2022-03-18 02:11:40,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:40,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [113874737] [2022-03-18 02:11:40,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:40,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:41,019 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:41,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1543133877] [2022-03-18 02:11:41,019 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 02:11:41,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:41,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:41,023 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 02:11:41,024 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 02:11:41,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-18 02:11:41,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 02:11:41,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 02:11:41,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:41,243 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 02:11:41,243 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:41,243 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:41,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [113874737] [2022-03-18 02:11:41,244 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:41,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543133877] [2022-03-18 02:11:41,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543133877] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:41,244 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:41,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:41,245 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:41,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1071609343] [2022-03-18 02:11:41,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1071609343] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:41,246 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:41,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:41,246 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463621909] [2022-03-18 02:11:41,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:41,247 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 02:11:41,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:41,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 02:11:41,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-18 02:11:41,248 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:41,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:41,288 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-03-18 02:11:41,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 02:11:41,301 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 02:11:41,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:41,302 INFO L225 Difference]: With dead ends: 34 [2022-03-18 02:11:41,302 INFO L226 Difference]: Without dead ends: 27 [2022-03-18 02:11:41,303 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-18 02:11:41,304 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 3 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:41,304 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 81 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:41,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-18 02:11:41,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-03-18 02:11:41,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:11:41,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-03-18 02:11:41,311 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 15 [2022-03-18 02:11:41,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:41,311 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-03-18 02:11:41,311 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:41,311 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-03-18 02:11:41,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-18 02:11:41,312 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:41,312 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:41,343 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 02:11:41,528 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:41,529 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:41,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:41,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1207346058, now seen corresponding path program 1 times [2022-03-18 02:11:41,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:41,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1399475600] [2022-03-18 02:11:41,530 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 02:11:41,530 INFO L85 PathProgramCache]: Analyzing trace with hash -1207346058, now seen corresponding path program 2 times [2022-03-18 02:11:41,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:41,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [136385658] [2022-03-18 02:11:41,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:41,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:41,541 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:41,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [731806845] [2022-03-18 02:11:41,542 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 02:11:41,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:41,542 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:41,552 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 02:11:41,574 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 02:11:41,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-18 02:11:41,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 02:11:41,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-18 02:11:41,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:41,816 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 02:11:41,816 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:41,816 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:41,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [136385658] [2022-03-18 02:11:41,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:41,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731806845] [2022-03-18 02:11:41,818 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [731806845] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:41,818 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:41,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:41,819 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:41,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1399475600] [2022-03-18 02:11:41,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1399475600] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:41,819 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:41,819 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:41,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141722310] [2022-03-18 02:11:41,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:41,820 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 02:11:41,820 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:41,820 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 02:11:41,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-03-18 02:11:41,821 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states 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 02:11:41,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:41,912 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2022-03-18 02:11:41,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 02:11:41,914 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-18 02:11:41,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:41,915 INFO L225 Difference]: With dead ends: 35 [2022-03-18 02:11:41,915 INFO L226 Difference]: Without dead ends: 32 [2022-03-18 02:11:41,916 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-03-18 02:11:41,916 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 9 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:41,917 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 96 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:41,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-18 02:11:41,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-18 02:11:41,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:41,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2022-03-18 02:11:41,935 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 15 [2022-03-18 02:11:41,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:41,936 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2022-03-18 02:11:41,936 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states 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 02:11:41,936 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2022-03-18 02:11:41,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-18 02:11:41,937 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:41,937 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:41,960 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-03-18 02:11:42,151 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-03-18 02:11:42,152 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:42,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:42,152 INFO L85 PathProgramCache]: Analyzing trace with hash -352921097, now seen corresponding path program 1 times [2022-03-18 02:11:42,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:42,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1998776175] [2022-03-18 02:11:42,339 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:42,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1104810099, now seen corresponding path program 1 times [2022-03-18 02:11:42,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:42,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057720248] [2022-03-18 02:11:42,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:42,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:42,353 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:42,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2066644867] [2022-03-18 02:11:42,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:42,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:42,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:42,355 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 02:11:42,385 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 02:11:42,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:42,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 02:11:42,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:42,475 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 02:11:42,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:42,476 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:42,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057720248] [2022-03-18 02:11:42,476 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:42,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066644867] [2022-03-18 02:11:42,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066644867] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:42,476 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:42,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:42,523 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:42,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1998776175] [2022-03-18 02:11:42,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1998776175] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:42,526 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:42,526 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 02:11:42,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472848934] [2022-03-18 02:11:42,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:42,530 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 02:11:42,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:42,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 02:11:42,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-18 02:11:42,531 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:42,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:42,591 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2022-03-18 02:11:42,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 02:11:42,592 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-18 02:11:42,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:42,594 INFO L225 Difference]: With dead ends: 46 [2022-03-18 02:11:42,595 INFO L226 Difference]: Without dead ends: 34 [2022-03-18 02:11:42,596 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-03-18 02:11:42,597 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 2 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:42,597 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 83 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:42,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-18 02:11:42,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-18 02:11:42,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 25 states have (on average 1.28) internal successors, (32), 26 states have internal predecessors, (32), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:42,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-03-18 02:11:42,609 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 17 [2022-03-18 02:11:42,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:42,609 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-03-18 02:11:42,609 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:42,609 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-03-18 02:11:42,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 02:11:42,610 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:42,610 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:42,630 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 02:11:42,810 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:42,811 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:42,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:42,811 INFO L85 PathProgramCache]: Analyzing trace with hash 1615882355, now seen corresponding path program 1 times [2022-03-18 02:11:42,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:42,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1053102685] [2022-03-18 02:11:43,033 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:43,034 INFO L85 PathProgramCache]: Analyzing trace with hash -152059465, now seen corresponding path program 1 times [2022-03-18 02:11:43,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:43,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553655823] [2022-03-18 02:11:43,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:43,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:43,044 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:43,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [198286874] [2022-03-18 02:11:43,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:43,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:43,045 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:43,048 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 02:11:43,067 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 02:11:43,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:43,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 02:11:43,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:43,135 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 02:11:43,136 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:43,136 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:43,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553655823] [2022-03-18 02:11:43,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:43,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198286874] [2022-03-18 02:11:43,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198286874] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:43,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:43,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:43,173 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:43,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1053102685] [2022-03-18 02:11:43,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1053102685] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:43,176 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:43,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 02:11:43,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831619537] [2022-03-18 02:11:43,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:43,177 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 02:11:43,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:43,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 02:11:43,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-18 02:11:43,179 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:43,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:43,245 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2022-03-18 02:11:43,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-18 02:11:43,246 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-18 02:11:43,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:43,249 INFO L225 Difference]: With dead ends: 45 [2022-03-18 02:11:43,249 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 02:11:43,250 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-03-18 02:11:43,253 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 4 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:43,253 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 82 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:43,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 02:11:43,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-03-18 02:11:43,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:43,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-03-18 02:11:43,263 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 18 [2022-03-18 02:11:43,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:43,263 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-03-18 02:11:43,263 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:43,263 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-03-18 02:11:43,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 02:11:43,264 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:43,264 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:43,288 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-03-18 02:11:43,483 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:43,484 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:43,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1617669815, now seen corresponding path program 1 times [2022-03-18 02:11:43,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:43,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1725878968] [2022-03-18 02:11:43,662 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:43,663 INFO L85 PathProgramCache]: Analyzing trace with hash 136759355, now seen corresponding path program 1 times [2022-03-18 02:11:43,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:43,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982204] [2022-03-18 02:11:43,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:43,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:43,681 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:43,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1633136988] [2022-03-18 02:11:43,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:43,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:43,682 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:43,686 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 02:11:43,692 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 02:11:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:43,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-18 02:11:43,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:43,853 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 02:11:43,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:43,854 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:43,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982204] [2022-03-18 02:11:43,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:43,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633136988] [2022-03-18 02:11:43,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633136988] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:43,854 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:43,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:43,904 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:43,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1725878968] [2022-03-18 02:11:43,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1725878968] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:43,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:43,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-18 02:11:43,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151328212] [2022-03-18 02:11:43,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:43,905 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-18 02:11:43,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:43,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-18 02:11:43,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-03-18 02:11:43,905 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 2 states 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 02:11:44,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:44,028 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2022-03-18 02:11:44,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 02:11:44,029 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 2 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 18 [2022-03-18 02:11:44,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:44,030 INFO L225 Difference]: With dead ends: 46 [2022-03-18 02:11:44,030 INFO L226 Difference]: Without dead ends: 43 [2022-03-18 02:11:44,030 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-03-18 02:11:44,031 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 12 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 79 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 79 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:44,031 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 103 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 79 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:44,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-18 02:11:44,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2022-03-18 02:11:44,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 26 states have (on average 1.3076923076923077) internal successors, (34), 27 states have internal predecessors, (34), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:44,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-03-18 02:11:44,037 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 18 [2022-03-18 02:11:44,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:44,037 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-03-18 02:11:44,037 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 8 states have internal predecessors, (14), 2 states have call successors, (3), 2 states 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 02:11:44,038 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-03-18 02:11:44,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 02:11:44,038 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:44,038 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:44,067 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 02:11:44,254 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:44,254 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:44,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:44,255 INFO L85 PathProgramCache]: Analyzing trace with hash 68001784, now seen corresponding path program 2 times [2022-03-18 02:11:44,255 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:44,255 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1826841530] [2022-03-18 02:11:44,489 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:44,489 INFO L85 PathProgramCache]: Analyzing trace with hash 716945331, now seen corresponding path program 1 times [2022-03-18 02:11:44,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:44,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579653423] [2022-03-18 02:11:44,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:44,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:44,498 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:44,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1901134915] [2022-03-18 02:11:44,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:44,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:44,499 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:44,501 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 02:11:44,522 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 02:11:44,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:44,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 02:11:44,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:44,593 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 02:11:44,594 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:44,594 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:44,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579653423] [2022-03-18 02:11:44,594 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:44,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901134915] [2022-03-18 02:11:44,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901134915] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:44,595 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:44,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:44,675 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:44,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1826841530] [2022-03-18 02:11:44,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1826841530] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:44,676 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:44,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 02:11:44,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035140136] [2022-03-18 02:11:44,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:44,677 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 02:11:44,677 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:44,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 02:11:44,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-18 02:11:44,677 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:44,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:44,750 INFO L93 Difference]: Finished difference Result 50 states and 61 transitions. [2022-03-18 02:11:44,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-18 02:11:44,750 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-18 02:11:44,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:44,753 INFO L225 Difference]: With dead ends: 50 [2022-03-18 02:11:44,753 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 02:11:44,753 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-18 02:11:44,754 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:44,754 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 97 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:44,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 02:11:44,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2022-03-18 02:11:44,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:44,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-03-18 02:11:44,769 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 20 [2022-03-18 02:11:44,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:44,770 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-03-18 02:11:44,770 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 10 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:44,770 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-03-18 02:11:44,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 02:11:44,775 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:44,775 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:44,795 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 02:11:44,983 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:44,984 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:44,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:44,984 INFO L85 PathProgramCache]: Analyzing trace with hash 1779589778, now seen corresponding path program 2 times [2022-03-18 02:11:44,984 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:44,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1692049907] [2022-03-18 02:11:45,115 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:45,116 INFO L85 PathProgramCache]: Analyzing trace with hash 709034615, now seen corresponding path program 1 times [2022-03-18 02:11:45,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:45,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842800101] [2022-03-18 02:11:45,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:45,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:45,126 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:45,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1086782211] [2022-03-18 02:11:45,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:45,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:45,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:45,128 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 02:11:45,154 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 02:11:45,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:45,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 02:11:45,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:45,221 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 02:11:45,221 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:45,221 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:45,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842800101] [2022-03-18 02:11:45,221 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:45,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086782211] [2022-03-18 02:11:45,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086782211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:45,222 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:45,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:45,303 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:45,304 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1692049907] [2022-03-18 02:11:45,304 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1692049907] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:45,304 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:45,304 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-18 02:11:45,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848553310] [2022-03-18 02:11:45,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:45,304 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 02:11:45,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:45,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 02:11:45,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-03-18 02:11:45,307 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:45,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:45,400 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2022-03-18 02:11:45,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 02:11:45,401 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-18 02:11:45,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:45,402 INFO L225 Difference]: With dead ends: 50 [2022-03-18 02:11:45,402 INFO L226 Difference]: Without dead ends: 43 [2022-03-18 02:11:45,402 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-03-18 02:11:45,403 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 5 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:45,403 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 119 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:45,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-18 02:11:45,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-03-18 02:11:45,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.2903225806451613) internal successors, (40), 32 states have internal predecessors, (40), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:45,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2022-03-18 02:11:45,409 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 21 [2022-03-18 02:11:45,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:45,410 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2022-03-18 02:11:45,410 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 11 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:45,410 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2022-03-18 02:11:45,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-18 02:11:45,410 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:45,411 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:45,439 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 02:11:45,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:45,624 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:45,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:45,624 INFO L85 PathProgramCache]: Analyzing trace with hash 1781377238, now seen corresponding path program 2 times [2022-03-18 02:11:45,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:45,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [368676938] [2022-03-18 02:11:45,795 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:45,795 INFO L85 PathProgramCache]: Analyzing trace with hash 997853435, now seen corresponding path program 1 times [2022-03-18 02:11:45,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:45,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187119099] [2022-03-18 02:11:45,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:45,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:45,804 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:45,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1464514691] [2022-03-18 02:11:45,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:45,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:45,805 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:45,806 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 02:11:45,807 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 02:11:45,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:45,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-18 02:11:45,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:45,984 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 02:11:45,984 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:45,984 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:45,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187119099] [2022-03-18 02:11:45,984 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:45,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464514691] [2022-03-18 02:11:45,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464514691] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:45,985 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:45,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:46,093 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:46,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [368676938] [2022-03-18 02:11:46,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [368676938] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:46,093 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:46,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-18 02:11:46,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837424481] [2022-03-18 02:11:46,094 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:46,094 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-18 02:11:46,094 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:46,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-18 02:11:46,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-18 02:11:46,095 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 2 states 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 02:11:46,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:46,271 INFO L93 Difference]: Finished difference Result 57 states and 66 transitions. [2022-03-18 02:11:46,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 02:11:46,271 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-18 02:11:46,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:46,272 INFO L225 Difference]: With dead ends: 57 [2022-03-18 02:11:46,272 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 02:11:46,272 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-03-18 02:11:46,273 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 12 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:46,273 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 154 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:46,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 02:11:46,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2022-03-18 02:11:46,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.3103448275862069) internal successors, (38), 30 states have internal predecessors, (38), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:46,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2022-03-18 02:11:46,278 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 21 [2022-03-18 02:11:46,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:46,279 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2022-03-18 02:11:46,279 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 states have internal predecessors, (17), 2 states have call successors, (3), 2 states 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 02:11:46,279 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2022-03-18 02:11:46,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 02:11:46,279 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:46,280 INFO L500 BasicCegarLoop]: trace histogram [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 02:11:46,300 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-18 02:11:46,492 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-18 02:11:46,492 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:46,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:46,492 INFO L85 PathProgramCache]: Analyzing trace with hash 1626008211, now seen corresponding path program 1 times [2022-03-18 02:11:46,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:46,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [133202372] [2022-03-18 02:11:46,493 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-18 02:11:46,493 INFO L85 PathProgramCache]: Analyzing trace with hash 1626008211, now seen corresponding path program 2 times [2022-03-18 02:11:46,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:46,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650362197] [2022-03-18 02:11:46,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:46,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:46,501 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:46,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [98988916] [2022-03-18 02:11:46,501 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 02:11:46,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:46,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:46,503 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 02:11:46,505 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 02:11:46,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 02:11:46,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 02:11:46,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 02:11:46,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:46,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-18 02:11:46,697 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:46,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:46,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650362197] [2022-03-18 02:11:46,697 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:46,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98988916] [2022-03-18 02:11:46,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98988916] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-18 02:11:46,698 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-18 02:11:46,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-03-18 02:11:46,698 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:46,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [133202372] [2022-03-18 02:11:46,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [133202372] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:46,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:46,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:46,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245226394] [2022-03-18 02:11:46,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:46,699 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 02:11:46,699 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:46,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 02:11:46,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-03-18 02:11:46,699 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:11:46,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:46,742 INFO L93 Difference]: Finished difference Result 58 states and 67 transitions. [2022-03-18 02:11:46,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-18 02:11:46,743 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), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2022-03-18 02:11:46,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:46,744 INFO L225 Difference]: With dead ends: 58 [2022-03-18 02:11:46,745 INFO L226 Difference]: Without dead ends: 51 [2022-03-18 02:11:46,745 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2022-03-18 02:11:46,745 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 12 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:46,746 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 83 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:46,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-18 02:11:46,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2022-03-18 02:11:46,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.263157894736842) internal successors, (48), 39 states have internal predecessors, (48), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-18 02:11:46,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 58 transitions. [2022-03-18 02:11:46,762 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 58 transitions. Word has length 24 [2022-03-18 02:11:46,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:46,762 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 58 transitions. [2022-03-18 02:11:46,763 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), 4 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:11:46,763 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 58 transitions. [2022-03-18 02:11:46,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 02:11:46,764 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:46,764 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 02:11:46,792 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 02:11:46,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:46,979 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:46,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:46,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1627795671, now seen corresponding path program 1 times [2022-03-18 02:11:46,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:46,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [118469930] [2022-03-18 02:11:46,981 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-18 02:11:46,981 INFO L85 PathProgramCache]: Analyzing trace with hash 1627795671, now seen corresponding path program 2 times [2022-03-18 02:11:46,981 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:46,981 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895011536] [2022-03-18 02:11:46,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:46,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:46,996 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:46,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [785393711] [2022-03-18 02:11:46,997 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 02:11:46,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:46,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:46,998 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 02:11:47,026 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 02:11:47,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 02:11:47,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 02:11:47,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 02:11:47,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:47,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:47,118 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:47,118 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:47,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895011536] [2022-03-18 02:11:47,118 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:47,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785393711] [2022-03-18 02:11:47,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785393711] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:47,118 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:47,118 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:47,119 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:47,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [118469930] [2022-03-18 02:11:47,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [118469930] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:47,119 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:47,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:47,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467840608] [2022-03-18 02:11:47,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:47,119 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 02:11:47,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:47,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 02:11:47,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 02:11:47,120 INFO L87 Difference]: Start difference. First operand 49 states and 58 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 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 02:11:47,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:47,137 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2022-03-18 02:11:47,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 02:11:47,138 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 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 02:11:47,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:47,139 INFO L225 Difference]: With dead ends: 61 [2022-03-18 02:11:47,139 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 02:11:47,139 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 02:11:47,140 INFO L912 BasicCegarLoop]: 25 mSDtfsCounter, 0 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:47,140 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:47,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 02:11:47,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-18 02:11:47,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 30 states have internal predecessors, (37), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:47,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2022-03-18 02:11:47,156 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 24 [2022-03-18 02:11:47,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:47,158 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2022-03-18 02:11:47,158 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 3 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 02:11:47,158 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2022-03-18 02:11:47,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 02:11:47,162 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:47,162 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:47,188 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 02:11:47,387 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-18 02:11:47,388 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:47,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:47,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1522954665, now seen corresponding path program 3 times [2022-03-18 02:11:47,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:47,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1362523751] [2022-03-18 02:11:47,544 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:47,545 INFO L85 PathProgramCache]: Analyzing trace with hash 329080563, now seen corresponding path program 1 times [2022-03-18 02:11:47,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:47,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806568020] [2022-03-18 02:11:47,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:47,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:47,552 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:47,553 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1740583837] [2022-03-18 02:11:47,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:47,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:47,553 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:47,556 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 02:11:47,580 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 02:11:47,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:47,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 02:11:47,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:47,634 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 02:11:47,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:47,635 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:47,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806568020] [2022-03-18 02:11:47,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:47,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740583837] [2022-03-18 02:11:47,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1740583837] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:47,635 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:47,636 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:47,764 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:47,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1362523751] [2022-03-18 02:11:47,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1362523751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:47,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:47,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 02:11:47,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250693447] [2022-03-18 02:11:47,765 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:47,765 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 02:11:47,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:47,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 02:11:47,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:11:47,766 INFO L87 Difference]: Start difference. First operand 38 states and 45 transitions. Second operand has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:47,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:47,869 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2022-03-18 02:11:47,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 02:11:47,869 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-18 02:11:47,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:47,870 INFO L225 Difference]: With dead ends: 53 [2022-03-18 02:11:47,870 INFO L226 Difference]: Without dead ends: 41 [2022-03-18 02:11:47,871 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:11:47,871 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:47,871 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 134 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:47,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-18 02:11:47,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2022-03-18 02:11:47,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 32 states have internal predecessors, (39), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:47,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2022-03-18 02:11:47,876 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 23 [2022-03-18 02:11:47,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:47,876 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2022-03-18 02:11:47,876 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:47,876 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2022-03-18 02:11:47,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 02:11:47,877 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:47,877 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:47,902 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 02:11:48,091 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-18 02:11:48,091 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:48,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:48,092 INFO L85 PathProgramCache]: Analyzing trace with hash -295419885, now seen corresponding path program 3 times [2022-03-18 02:11:48,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:48,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1733053123] [2022-03-18 02:11:48,232 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:48,232 INFO L85 PathProgramCache]: Analyzing trace with hash 1570128695, now seen corresponding path program 1 times [2022-03-18 02:11:48,232 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:48,232 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708335511] [2022-03-18 02:11:48,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:48,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:48,240 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:48,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1457243308] [2022-03-18 02:11:48,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:48,240 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:48,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:48,250 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 02:11:48,272 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 02:11:48,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:48,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 02:11:48,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:48,334 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 02:11:48,334 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:48,334 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:48,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708335511] [2022-03-18 02:11:48,335 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:48,335 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457243308] [2022-03-18 02:11:48,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1457243308] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:48,335 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:48,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:48,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:48,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1733053123] [2022-03-18 02:11:48,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1733053123] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:48,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:48,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-18 02:11:48,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443094744] [2022-03-18 02:11:48,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:48,448 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-18 02:11:48,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:48,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-18 02:11:48,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 02:11:48,449 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:48,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:48,564 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2022-03-18 02:11:48,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 02:11:48,564 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-18 02:11:48,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:48,565 INFO L225 Difference]: With dead ends: 52 [2022-03-18 02:11:48,565 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 02:11:48,566 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2022-03-18 02:11:48,566 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:48,566 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 137 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 194 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:48,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 02:11:48,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2022-03-18 02:11:48,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 35 states have internal predecessors, (43), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:48,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2022-03-18 02:11:48,570 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 24 [2022-03-18 02:11:48,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:48,571 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2022-03-18 02:11:48,571 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:48,571 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2022-03-18 02:11:48,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-18 02:11:48,571 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:48,571 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:48,598 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 02:11:48,781 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-18 02:11:48,781 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:48,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:48,782 INFO L85 PathProgramCache]: Analyzing trace with hash -293632425, now seen corresponding path program 3 times [2022-03-18 02:11:48,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:48,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [441505436] [2022-03-18 02:11:48,944 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:48,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1858947515, now seen corresponding path program 1 times [2022-03-18 02:11:48,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:48,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429650145] [2022-03-18 02:11:48,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:48,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:48,951 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:48,951 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2092353950] [2022-03-18 02:11:48,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:48,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:48,954 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:48,956 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 02:11:48,984 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 02:11:49,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:49,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-18 02:11:49,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:49,101 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 02:11:49,102 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:49,102 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:49,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429650145] [2022-03-18 02:11:49,102 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:49,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092353950] [2022-03-18 02:11:49,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2092353950] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:49,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:49,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:49,222 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:49,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [441505436] [2022-03-18 02:11:49,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [441505436] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:49,223 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:49,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-18 02:11:49,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726104017] [2022-03-18 02:11:49,223 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:49,224 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-18 02:11:49,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:49,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-18 02:11:49,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-03-18 02:11:49,224 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 2 states 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 02:11:49,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:49,405 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2022-03-18 02:11:49,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-18 02:11:49,406 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 2 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 24 [2022-03-18 02:11:49,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:49,407 INFO L225 Difference]: With dead ends: 53 [2022-03-18 02:11:49,407 INFO L226 Difference]: Without dead ends: 50 [2022-03-18 02:11:49,407 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:11:49,408 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 13 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:49,408 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 202 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 02:11:49,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-18 02:11:49,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 41. [2022-03-18 02:11:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 32 states have (on average 1.28125) internal successors, (41), 33 states have internal predecessors, (41), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:49,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-18 02:11:49,412 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 24 [2022-03-18 02:11:49,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:49,412 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-18 02:11:49,412 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 2 states have call successors, (3), 2 states 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 02:11:49,413 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-18 02:11:49,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 02:11:49,413 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:49,413 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 02:11:49,431 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-18 02:11:49,619 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-18 02:11:49,619 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:49,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:49,620 INFO L85 PathProgramCache]: Analyzing trace with hash -1817538190, now seen corresponding path program 1 times [2022-03-18 02:11:49,620 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:49,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [701424343] [2022-03-18 02:11:49,797 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:49,798 INFO L85 PathProgramCache]: Analyzing trace with hash -1887067474, now seen corresponding path program 1 times [2022-03-18 02:11:49,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:49,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297363829] [2022-03-18 02:11:49,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:49,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:49,805 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:49,805 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1378796803] [2022-03-18 02:11:49,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:49,805 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:49,805 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:49,814 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 02:11:49,815 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 02:11:49,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:49,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:11:49,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:49,911 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:49,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:49,911 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:49,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297363829] [2022-03-18 02:11:49,912 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:49,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378796803] [2022-03-18 02:11:49,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378796803] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:49,912 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:49,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:49,948 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:49,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [701424343] [2022-03-18 02:11:49,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [701424343] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:49,949 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:49,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:49,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736302464] [2022-03-18 02:11:49,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:49,949 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 02:11:49,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:49,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 02:11:49,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 02:11:49,950 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 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 02:11:49,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:49,984 INFO L93 Difference]: Finished difference Result 57 states and 69 transitions. [2022-03-18 02:11:49,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-18 02:11:49,985 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 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 02:11:49,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:49,985 INFO L225 Difference]: With dead ends: 57 [2022-03-18 02:11:49,985 INFO L226 Difference]: Without dead ends: 41 [2022-03-18 02:11:49,986 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 02:11:49,986 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:49,987 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 74 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 02:11:49,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-18 02:11:49,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-18 02:11:49,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 32 states have (on average 1.25) internal successors, (40), 33 states have internal predecessors, (40), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:49,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 48 transitions. [2022-03-18 02:11:49,990 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 48 transitions. Word has length 27 [2022-03-18 02:11:49,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:49,990 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 48 transitions. [2022-03-18 02:11:49,990 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 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 02:11:49,990 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 48 transitions. [2022-03-18 02:11:49,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-18 02:11:49,991 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:49,991 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:50,020 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 02:11:50,191 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:50,191 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:50,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:50,192 INFO L85 PathProgramCache]: Analyzing trace with hash 1552551832, now seen corresponding path program 4 times [2022-03-18 02:11:50,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:50,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1561701377] [2022-03-18 02:11:50,303 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:50,304 INFO L85 PathProgramCache]: Analyzing trace with hash -188072461, now seen corresponding path program 1 times [2022-03-18 02:11:50,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:50,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332186793] [2022-03-18 02:11:50,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:50,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:50,311 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:50,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2142290849] [2022-03-18 02:11:50,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:50,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:50,311 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:50,316 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 02:11:50,317 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 02:11:50,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:50,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-18 02:11:50,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:50,388 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 02:11:50,388 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:50,388 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:50,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332186793] [2022-03-18 02:11:50,389 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:50,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142290849] [2022-03-18 02:11:50,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142290849] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:50,389 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:50,389 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:50,579 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:50,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1561701377] [2022-03-18 02:11:50,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1561701377] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:50,579 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:50,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-18 02:11:50,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678638486] [2022-03-18 02:11:50,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:50,579 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-18 02:11:50,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:50,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-18 02:11:50,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2022-03-18 02:11:50,580 INFO L87 Difference]: Start difference. First operand 41 states and 48 transitions. Second operand has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:50,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:50,744 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2022-03-18 02:11:50,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 02:11:50,745 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-18 02:11:50,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:50,745 INFO L225 Difference]: With dead ends: 56 [2022-03-18 02:11:50,745 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 02:11:50,746 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2022-03-18 02:11:50,746 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 3 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:50,747 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 197 Invalid, 319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 02:11:50,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 02:11:50,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-03-18 02:11:50,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 34 states have (on average 1.2352941176470589) internal successors, (42), 35 states have internal predecessors, (42), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:50,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 50 transitions. [2022-03-18 02:11:50,751 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 50 transitions. Word has length 26 [2022-03-18 02:11:50,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:50,751 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 50 transitions. [2022-03-18 02:11:50,752 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:50,752 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 50 transitions. [2022-03-18 02:11:50,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 02:11:50,752 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:50,752 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:50,779 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 02:11:50,967 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-18 02:11:50,968 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:50,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:50,968 INFO L85 PathProgramCache]: Analyzing trace with hash 556001010, now seen corresponding path program 4 times [2022-03-18 02:11:50,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:50,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [879621476] [2022-03-18 02:11:51,118 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:51,119 INFO L85 PathProgramCache]: Analyzing trace with hash -1576713161, now seen corresponding path program 1 times [2022-03-18 02:11:51,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:51,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1508224015] [2022-03-18 02:11:51,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:51,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:51,126 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:51,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1883765868] [2022-03-18 02:11:51,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:51,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:51,126 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:51,127 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 02:11:51,154 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 02:11:51,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:51,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-18 02:11:51,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:51,219 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 02:11:51,219 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:51,219 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:51,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1508224015] [2022-03-18 02:11:51,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:51,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883765868] [2022-03-18 02:11:51,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883765868] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:51,220 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:51,220 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 02:11:51,382 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:51,382 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [879621476] [2022-03-18 02:11:51,382 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [879621476] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:51,383 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:51,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-18 02:11:51,383 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680323890] [2022-03-18 02:11:51,383 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:51,383 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-18 02:11:51,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:51,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-18 02:11:51,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-18 02:11:51,384 INFO L87 Difference]: Start difference. First operand 43 states and 50 transitions. Second operand has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:51,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:51,537 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-03-18 02:11:51,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 02:11:51,538 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-18 02:11:51,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:51,538 INFO L225 Difference]: With dead ends: 55 [2022-03-18 02:11:51,538 INFO L226 Difference]: Without dead ends: 48 [2022-03-18 02:11:51,539 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2022-03-18 02:11:51,539 INFO L912 BasicCegarLoop]: 22 mSDtfsCounter, 5 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:51,540 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 179 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:51,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-18 02:11:51,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2022-03-18 02:11:51,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 38 states have internal predecessors, (46), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:51,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2022-03-18 02:11:51,544 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 27 [2022-03-18 02:11:51,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:51,544 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2022-03-18 02:11:51,545 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-18 02:11:51,545 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2022-03-18 02:11:51,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-18 02:11:51,545 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:51,545 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:51,565 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 02:11:51,755 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-18 02:11:51,756 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:51,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:51,756 INFO L85 PathProgramCache]: Analyzing trace with hash 557788470, now seen corresponding path program 4 times [2022-03-18 02:11:51,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:51,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [37148020] [2022-03-18 02:11:51,901 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:51,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1287894341, now seen corresponding path program 1 times [2022-03-18 02:11:51,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:51,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234028421] [2022-03-18 02:11:51,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:51,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:51,913 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:51,914 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [848513968] [2022-03-18 02:11:51,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:51,914 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:51,914 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:51,915 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 02:11:51,929 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 02:11:51,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:51,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-18 02:11:51,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:52,017 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 02:11:52,017 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:52,017 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:52,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234028421] [2022-03-18 02:11:52,017 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:52,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848513968] [2022-03-18 02:11:52,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848513968] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:52,018 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:52,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:11:54,355 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:54,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [37148020] [2022-03-18 02:11:54,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [37148020] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:54,355 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:54,355 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 02:11:54,355 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086133385] [2022-03-18 02:11:54,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:54,356 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 02:11:54,356 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:54,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 02:11:54,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:11:54,357 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states 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 02:11:56,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:56,555 INFO L93 Difference]: Finished difference Result 60 states and 71 transitions. [2022-03-18 02:11:56,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 02:11:56,555 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-18 02:11:56,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:56,556 INFO L225 Difference]: With dead ends: 60 [2022-03-18 02:11:56,556 INFO L226 Difference]: Without dead ends: 57 [2022-03-18 02:11:56,556 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-03-18 02:11:56,556 INFO L912 BasicCegarLoop]: 16 mSDtfsCounter, 12 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:56,557 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 101 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-03-18 02:11:56,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-18 02:11:56,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2022-03-18 02:11:56,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.2571428571428571) internal successors, (44), 36 states have internal predecessors, (44), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:56,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2022-03-18 02:11:56,563 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 27 [2022-03-18 02:11:56,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:56,563 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2022-03-18 02:11:56,563 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 states have internal predecessors, (23), 2 states have call successors, (3), 2 states 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 02:11:56,563 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2022-03-18 02:11:56,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-18 02:11:56,564 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:56,564 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:56,591 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 02:11:56,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:56,788 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:56,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:56,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1080461875, now seen corresponding path program 2 times [2022-03-18 02:11:56,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:56,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1840655882] [2022-03-18 02:11:56,945 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:56,946 INFO L85 PathProgramCache]: Analyzing trace with hash 560447918, now seen corresponding path program 1 times [2022-03-18 02:11:56,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:56,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452308307] [2022-03-18 02:11:56,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:56,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:56,952 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:56,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1153556161] [2022-03-18 02:11:56,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:56,953 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:56,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:56,958 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 02:11:56,959 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 02:11:56,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:56,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:11:56,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:57,067 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:57,068 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:57,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452308307] [2022-03-18 02:11:57,068 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:57,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153556161] [2022-03-18 02:11:57,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153556161] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:57,068 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:57,068 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:57,152 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:57,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1840655882] [2022-03-18 02:11:57,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1840655882] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:57,152 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:57,153 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-18 02:11:57,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187345263] [2022-03-18 02:11:57,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:57,153 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-18 02:11:57,153 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:57,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-18 02:11:57,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-18 02:11:57,154 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 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 02:11:57,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:11:57,220 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2022-03-18 02:11:57,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 02:11:57,221 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 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 30 [2022-03-18 02:11:57,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:11:57,221 INFO L225 Difference]: With dead ends: 69 [2022-03-18 02:11:57,221 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 02:11:57,222 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2022-03-18 02:11:57,222 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:11:57,222 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 88 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 02:11:57,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 02:11:57,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-18 02:11:57,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.2285714285714286) internal successors, (43), 36 states have internal predecessors, (43), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:11:57,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 51 transitions. [2022-03-18 02:11:57,229 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 51 transitions. Word has length 30 [2022-03-18 02:11:57,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:11:57,229 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 51 transitions. [2022-03-18 02:11:57,229 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 3 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 02:11:57,229 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 51 transitions. [2022-03-18 02:11:57,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-18 02:11:57,230 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:11:57,230 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:11:57,258 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-18 02:11:57,443 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:57,443 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:11:57,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:11:57,444 INFO L85 PathProgramCache]: Analyzing trace with hash -2032185902, now seen corresponding path program 3 times [2022-03-18 02:11:57,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:57,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [255077360] [2022-03-18 02:11:57,613 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:11:57,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1172326766, now seen corresponding path program 1 times [2022-03-18 02:11:57,614 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:11:57,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741962928] [2022-03-18 02:11:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:57,614 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:11:57,620 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:11:57,620 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1915406284] [2022-03-18 02:11:57,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:11:57,620 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:11:57,621 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:11:57,622 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 02:11:57,646 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 02:11:57,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:11:57,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:11:57,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:11:57,730 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:11:57,730 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:11:57,730 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:11:57,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741962928] [2022-03-18 02:11:57,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:11:57,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915406284] [2022-03-18 02:11:57,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915406284] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:57,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:57,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:11:57,851 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:11:57,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [255077360] [2022-03-18 02:11:57,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [255077360] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:11:57,851 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:11:57,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-18 02:11:57,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123859949] [2022-03-18 02:11:57,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:11:57,852 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-18 02:11:57,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:11:57,852 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-18 02:11:57,852 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2022-03-18 02:11:57,853 INFO L87 Difference]: Start difference. First operand 44 states and 51 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 3 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 02:11:59,949 WARN L534 Checker$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 02:12:02,086 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:02,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:02,277 INFO L93 Difference]: Finished difference Result 69 states and 81 transitions. [2022-03-18 02:12:02,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-18 02:12:02,278 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 3 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 02:12:02,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:02,279 INFO L225 Difference]: With dead ends: 69 [2022-03-18 02:12:02,279 INFO L226 Difference]: Without dead ends: 44 [2022-03-18 02:12:02,279 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2022-03-18 02:12:02,280 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:02,280 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 144 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 148 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2022-03-18 02:12:02,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-18 02:12:02,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-18 02:12:02,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 35 states have (on average 1.2) internal successors, (42), 36 states have internal predecessors, (42), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:02,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 50 transitions. [2022-03-18 02:12:02,286 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 50 transitions. Word has length 33 [2022-03-18 02:12:02,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:02,286 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 50 transitions. [2022-03-18 02:12:02,286 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 10 states have internal predecessors, (27), 3 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 02:12:02,286 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 50 transitions. [2022-03-18 02:12:02,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 02:12:02,287 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:02,287 INFO L500 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:02,311 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 02:12:02,504 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:02,504 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:02,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:02,505 INFO L85 PathProgramCache]: Analyzing trace with hash 1716777427, now seen corresponding path program 4 times [2022-03-18 02:12:02,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:02,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1917759298] [2022-03-18 02:12:02,695 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:02,695 INFO L85 PathProgramCache]: Analyzing trace with hash 1784205614, now seen corresponding path program 1 times [2022-03-18 02:12:02,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:02,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038352546] [2022-03-18 02:12:02,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:02,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:02,701 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:02,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [980005725] [2022-03-18 02:12:02,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:02,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:02,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:02,708 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 02:12:02,731 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 02:12:02,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:02,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:02,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:02,830 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:02,831 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:02,831 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:02,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038352546] [2022-03-18 02:12:02,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:02,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980005725] [2022-03-18 02:12:02,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980005725] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:02,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:02,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:03,135 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:03,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1917759298] [2022-03-18 02:12:03,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1917759298] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:03,136 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:03,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-18 02:12:03,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533802339] [2022-03-18 02:12:03,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:03,137 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-18 02:12:03,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:03,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-18 02:12:03,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2022-03-18 02:12:03,137 INFO L87 Difference]: Start difference. First operand 44 states and 50 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 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 02:12:03,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:03,386 INFO L93 Difference]: Finished difference Result 70 states and 82 transitions. [2022-03-18 02:12:03,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-18 02:12:03,388 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 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 02:12:03,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:03,388 INFO L225 Difference]: With dead ends: 70 [2022-03-18 02:12:03,388 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 02:12:03,389 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2022-03-18 02:12:03,389 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 1 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:03,389 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 173 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 02:12:03,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 02:12:03,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-18 02:12:03,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 37 states have internal predecessors, (43), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:03,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 51 transitions. [2022-03-18 02:12:03,395 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 51 transitions. Word has length 36 [2022-03-18 02:12:03,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:03,395 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 51 transitions. [2022-03-18 02:12:03,395 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 12 states have internal predecessors, (30), 3 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 02:12:03,396 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 51 transitions. [2022-03-18 02:12:03,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-18 02:12:03,396 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:03,396 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:03,421 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 02:12:03,615 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,SelfDestructingSolverStorable21 [2022-03-18 02:12:03,615 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:03,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:03,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1406520238, now seen corresponding path program 1 times [2022-03-18 02:12:03,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:03,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1065682787] [2022-03-18 02:12:03,809 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:03,809 INFO L85 PathProgramCache]: Analyzing trace with hash 905309554, now seen corresponding path program 1 times [2022-03-18 02:12:03,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:03,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346136098] [2022-03-18 02:12:03,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:03,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:03,815 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:03,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1849910234] [2022-03-18 02:12:03,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:03,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:03,816 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:03,820 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 02:12:03,821 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-18 02:12:03,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:03,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-18 02:12:03,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:03,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 02:12:03,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:03,907 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:03,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346136098] [2022-03-18 02:12:03,907 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:03,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849910234] [2022-03-18 02:12:03,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849910234] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:03,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:03,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 02:12:10,091 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:10,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1065682787] [2022-03-18 02:12:10,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1065682787] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:10,091 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:10,091 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-18 02:12:10,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922031484] [2022-03-18 02:12:10,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:10,092 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 02:12:10,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:10,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 02:12:10,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=181, Unknown=1, NotChecked=0, Total=240 [2022-03-18 02:12:10,092 INFO L87 Difference]: Start difference. First operand 45 states and 51 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:12:13,953 WARN L534 Checker$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 02:12:23,544 WARN L232 SmtUtils]: Spent 6.82s on a formula simplification. DAG size of input: 61 DAG size of output: 45 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-18 02:12:26,928 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:27,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:27,067 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2022-03-18 02:12:27,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-18 02:12:27,068 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 38 [2022-03-18 02:12:27,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:27,068 INFO L225 Difference]: With dead ends: 69 [2022-03-18 02:12:27,068 INFO L226 Difference]: Without dead ends: 46 [2022-03-18 02:12:27,069 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=70, Invalid=234, Unknown=2, NotChecked=0, Total=306 [2022-03-18 02:12:27,069 INFO L912 BasicCegarLoop]: 21 mSDtfsCounter, 7 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 140 mSolverCounterSat, 3 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 140 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.4s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:27,069 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 122 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 140 Invalid, 2 Unknown, 0 Unchecked, 7.4s Time] [2022-03-18 02:12:27,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-18 02:12:27,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2022-03-18 02:12:27,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:27,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 50 transitions. [2022-03-18 02:12:27,076 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 50 transitions. Word has length 38 [2022-03-18 02:12:27,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:27,076 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 50 transitions. [2022-03-18 02:12:27,076 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 02:12:27,076 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 50 transitions. [2022-03-18 02:12:27,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-18 02:12:27,076 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:27,077 INFO L500 BasicCegarLoop]: trace histogram [6, 6, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:27,094 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-18 02:12:27,279 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-03-18 02:12:27,280 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:27,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:27,280 INFO L85 PathProgramCache]: Analyzing trace with hash 753746482, now seen corresponding path program 5 times [2022-03-18 02:12:27,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:27,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [625962112] [2022-03-18 02:12:27,486 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:27,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1287003986, now seen corresponding path program 1 times [2022-03-18 02:12:27,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:27,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063099986] [2022-03-18 02:12:27,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:27,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:27,492 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:27,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2063444023] [2022-03-18 02:12:27,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:27,492 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:27,492 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:27,499 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:27,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-18 02:12:27,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:27,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:27,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:27,611 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:27,611 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:27,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:27,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063099986] [2022-03-18 02:12:27,611 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:27,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063444023] [2022-03-18 02:12:27,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063444023] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:27,612 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:27,612 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:27,916 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:27,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [625962112] [2022-03-18 02:12:27,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [625962112] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:27,916 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:27,917 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-18 02:12:27,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561799977] [2022-03-18 02:12:27,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:27,917 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-18 02:12:27,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:27,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-18 02:12:27,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:12:27,917 INFO L87 Difference]: Start difference. First operand 45 states and 50 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 3 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 02:12:30,121 WARN L534 Checker$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 02:12:32,267 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:34,404 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:34,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:34,585 INFO L93 Difference]: Finished difference Result 73 states and 84 transitions. [2022-03-18 02:12:34,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-18 02:12:34,586 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 3 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 02:12:34,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:34,587 INFO L225 Difference]: With dead ends: 73 [2022-03-18 02:12:34,587 INFO L226 Difference]: Without dead ends: 48 [2022-03-18 02:12:34,587 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2022-03-18 02:12:34,587 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:34,588 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 194 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 292 Invalid, 3 Unknown, 0 Unchecked, 6.7s Time] [2022-03-18 02:12:34,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-18 02:12:34,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-18 02:12:34,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 40 states have internal predecessors, (45), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:34,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2022-03-18 02:12:34,595 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 39 [2022-03-18 02:12:34,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:34,595 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2022-03-18 02:12:34,595 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 14 states have internal predecessors, (33), 3 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 02:12:34,595 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2022-03-18 02:12:34,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-18 02:12:34,596 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:34,596 INFO L500 BasicCegarLoop]: trace histogram [7, 7, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:34,619 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-18 02:12:34,815 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:34,815 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:34,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:34,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1480401267, now seen corresponding path program 6 times [2022-03-18 02:12:34,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:34,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1551827193] [2022-03-18 02:12:35,018 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:35,019 INFO L85 PathProgramCache]: Analyzing trace with hash -675125138, now seen corresponding path program 1 times [2022-03-18 02:12:35,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:35,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100286012] [2022-03-18 02:12:35,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:35,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:35,025 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:35,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2090604285] [2022-03-18 02:12:35,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:35,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:35,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:35,027 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:35,043 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-18 02:12:35,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:35,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:35,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:35,143 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:35,143 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:35,143 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:35,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100286012] [2022-03-18 02:12:35,144 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:35,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090604285] [2022-03-18 02:12:35,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090604285] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:35,144 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:35,144 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:35,526 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:35,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1551827193] [2022-03-18 02:12:35,527 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1551827193] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:35,527 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:35,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-18 02:12:35,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844471501] [2022-03-18 02:12:35,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:35,527 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-18 02:12:35,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:35,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-18 02:12:35,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2022-03-18 02:12:35,528 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 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 02:12:37,813 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:39,934 WARN L534 Checker$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 02:12:40,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:40,159 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2022-03-18 02:12:40,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-18 02:12:40,160 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 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 42 [2022-03-18 02:12:40,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:40,160 INFO L225 Difference]: With dead ends: 76 [2022-03-18 02:12:40,160 INFO L226 Difference]: Without dead ends: 51 [2022-03-18 02:12:40,161 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2022-03-18 02:12:40,161 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 199 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 387 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:40,161 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 222 Invalid, 387 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 385 Invalid, 2 Unknown, 0 Unchecked, 4.6s Time] [2022-03-18 02:12:40,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-18 02:12:40,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-18 02:12:40,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 42 states have (on average 1.1428571428571428) internal successors, (48), 43 states have internal predecessors, (48), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:40,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2022-03-18 02:12:40,169 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 42 [2022-03-18 02:12:40,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:40,169 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2022-03-18 02:12:40,170 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 16 states have internal predecessors, (36), 3 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 02:12:40,170 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2022-03-18 02:12:40,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-18 02:12:40,170 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:40,170 INFO L500 BasicCegarLoop]: trace histogram [8, 8, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:40,192 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-18 02:12:40,383 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:40,383 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:40,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:40,384 INFO L85 PathProgramCache]: Analyzing trace with hash -1677037934, now seen corresponding path program 7 times [2022-03-18 02:12:40,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:40,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2058927403] [2022-03-18 02:12:40,561 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:40,562 INFO L85 PathProgramCache]: Analyzing trace with hash -63246290, now seen corresponding path program 1 times [2022-03-18 02:12:40,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:40,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [764370061] [2022-03-18 02:12:40,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:40,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:40,567 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:40,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1435432173] [2022-03-18 02:12:40,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:40,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:40,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:40,569 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:40,572 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-18 02:12:40,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:40,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:40,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:40,657 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:40,657 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:40,657 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:40,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [764370061] [2022-03-18 02:12:40,657 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:40,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435432173] [2022-03-18 02:12:40,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435432173] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:40,658 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:40,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:41,110 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:41,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2058927403] [2022-03-18 02:12:41,110 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2058927403] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:41,110 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:41,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-18 02:12:41,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629453582] [2022-03-18 02:12:41,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:41,111 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-18 02:12:41,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:41,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-18 02:12:41,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2022-03-18 02:12:41,111 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 18 states have internal predecessors, (39), 3 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 02:12:43,417 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:45,559 WARN L534 Checker$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 02:12:47,694 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:47,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:47,883 INFO L93 Difference]: Finished difference Result 79 states and 90 transitions. [2022-03-18 02:12:47,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 02:12:47,883 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 18 states have internal predecessors, (39), 3 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 45 [2022-03-18 02:12:47,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:47,884 INFO L225 Difference]: With dead ends: 79 [2022-03-18 02:12:47,884 INFO L226 Difference]: Without dead ends: 54 [2022-03-18 02:12:47,885 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2022-03-18 02:12:47,885 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:47,885 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 224 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 440 Invalid, 3 Unknown, 0 Unchecked, 6.8s Time] [2022-03-18 02:12:47,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-18 02:12:47,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-18 02:12:47,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 45 states have (on average 1.1333333333333333) internal successors, (51), 46 states have internal predecessors, (51), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:47,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2022-03-18 02:12:47,896 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 45 [2022-03-18 02:12:47,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:47,897 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2022-03-18 02:12:47,897 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 18 states have internal predecessors, (39), 3 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 02:12:47,897 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2022-03-18 02:12:47,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-18 02:12:47,897 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:47,897 INFO L500 BasicCegarLoop]: trace histogram [9, 9, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:47,915 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-18 02:12:48,102 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-18 02:12:48,103 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:48,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:48,103 INFO L85 PathProgramCache]: Analyzing trace with hash -869525229, now seen corresponding path program 8 times [2022-03-18 02:12:48,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:48,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [774848344] [2022-03-18 02:12:48,318 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:48,318 INFO L85 PathProgramCache]: Analyzing trace with hash 548632558, now seen corresponding path program 1 times [2022-03-18 02:12:48,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:48,318 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624195683] [2022-03-18 02:12:48,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:48,318 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:48,324 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:48,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [971150476] [2022-03-18 02:12:48,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:48,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:48,324 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:48,338 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:48,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-18 02:12:48,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:48,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:48,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:48,459 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:48,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:48,460 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:48,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624195683] [2022-03-18 02:12:48,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:48,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971150476] [2022-03-18 02:12:48,460 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [971150476] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:48,460 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:48,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:49,101 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:49,102 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [774848344] [2022-03-18 02:12:49,102 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [774848344] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:49,102 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:49,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-18 02:12:49,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913090071] [2022-03-18 02:12:49,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:49,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 02:12:49,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:49,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 02:12:49,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2022-03-18 02:12:49,103 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 3 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 02:12:49,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:49,580 INFO L93 Difference]: Finished difference Result 82 states and 93 transitions. [2022-03-18 02:12:49,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-18 02:12:49,582 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 3 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 48 [2022-03-18 02:12:49,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:49,582 INFO L225 Difference]: With dead ends: 82 [2022-03-18 02:12:49,582 INFO L226 Difference]: Without dead ends: 57 [2022-03-18 02:12:49,583 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2022-03-18 02:12:49,583 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 580 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:49,583 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 265 Invalid, 580 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 02:12:49,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-18 02:12:49,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-18 02:12:49,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 48 states have (on average 1.125) internal successors, (54), 49 states have internal predecessors, (54), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:49,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2022-03-18 02:12:49,591 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 48 [2022-03-18 02:12:49,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:49,591 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2022-03-18 02:12:49,591 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.1) internal successors, (42), 20 states have internal predecessors, (42), 3 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 02:12:49,591 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2022-03-18 02:12:49,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-18 02:12:49,592 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:49,592 INFO L500 BasicCegarLoop]: trace histogram [10, 10, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:49,609 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-03-18 02:12:49,795 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-18 02:12:49,796 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:49,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:49,796 INFO L85 PathProgramCache]: Analyzing trace with hash -370355470, now seen corresponding path program 9 times [2022-03-18 02:12:49,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:49,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1971914856] [2022-03-18 02:12:49,938 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:49,939 INFO L85 PathProgramCache]: Analyzing trace with hash 1160511406, now seen corresponding path program 1 times [2022-03-18 02:12:49,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:49,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215304626] [2022-03-18 02:12:49,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:49,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:49,945 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:49,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1078121386] [2022-03-18 02:12:49,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:49,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:49,946 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:49,947 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:49,961 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-18 02:12:49,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:49,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:49,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:50,041 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:50,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:50,041 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:50,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215304626] [2022-03-18 02:12:50,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:50,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078121386] [2022-03-18 02:12:50,042 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078121386] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:50,042 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:50,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:50,751 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:50,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1971914856] [2022-03-18 02:12:50,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1971914856] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:50,751 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:50,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-18 02:12:50,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474819835] [2022-03-18 02:12:50,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:50,752 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-18 02:12:50,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:50,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-18 02:12:50,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2022-03-18 02:12:50,753 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 3 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 02:12:51,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:51,279 INFO L93 Difference]: Finished difference Result 85 states and 96 transitions. [2022-03-18 02:12:51,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-18 02:12:51,279 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 3 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 51 [2022-03-18 02:12:51,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:51,280 INFO L225 Difference]: With dead ends: 85 [2022-03-18 02:12:51,280 INFO L226 Difference]: Without dead ends: 60 [2022-03-18 02:12:51,281 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2022-03-18 02:12:51,281 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:51,281 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 293 Invalid, 705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-18 02:12:51,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-18 02:12:51,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-03-18 02:12:51,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 51 states have (on average 1.1176470588235294) internal successors, (57), 52 states have internal predecessors, (57), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:51,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2022-03-18 02:12:51,288 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 51 [2022-03-18 02:12:51,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:51,288 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2022-03-18 02:12:51,289 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 22 states have internal predecessors, (45), 3 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 02:12:51,289 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2022-03-18 02:12:51,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-18 02:12:51,289 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:51,289 INFO L500 BasicCegarLoop]: trace histogram [11, 11, 10, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:51,310 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-18 02:12:51,502 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-18 02:12:51,502 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:12:51,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:12:51,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1219156147, now seen corresponding path program 10 times [2022-03-18 02:12:51,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:51,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1156353225] [2022-03-18 02:12:51,704 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:12:51,704 INFO L85 PathProgramCache]: Analyzing trace with hash 1772390254, now seen corresponding path program 1 times [2022-03-18 02:12:51,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:12:51,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720543524] [2022-03-18 02:12:51,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:51,704 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:12:51,710 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:12:51,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674600216] [2022-03-18 02:12:51,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:12:51,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:12:51,710 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:12:51,712 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:12:51,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-18 02:12:51,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:12:51,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:12:51,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:12:51,799 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:12:51,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:12:51,800 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:12:51,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720543524] [2022-03-18 02:12:51,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:12:51,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674600216] [2022-03-18 02:12:51,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674600216] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:51,800 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:51,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:12:52,625 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:12:52,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1156353225] [2022-03-18 02:12:52,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1156353225] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:12:52,626 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:12:52,626 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-18 02:12:52,626 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459412452] [2022-03-18 02:12:52,626 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:12:52,626 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-18 02:12:52,626 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:12:52,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-18 02:12:52,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2022-03-18 02:12:52,627 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 3 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 02:12:55,301 WARN L534 Checker$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 02:12:57,433 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:59,574 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:12:59,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:12:59,782 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2022-03-18 02:12:59,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-18 02:12:59,782 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 3 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 54 [2022-03-18 02:12:59,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:12:59,783 INFO L225 Difference]: With dead ends: 88 [2022-03-18 02:12:59,783 INFO L226 Difference]: Without dead ends: 63 [2022-03-18 02:12:59,784 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2022-03-18 02:12:59,784 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 809 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:12:59,784 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 308 Invalid, 809 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 806 Invalid, 3 Unknown, 0 Unchecked, 7.1s Time] [2022-03-18 02:12:59,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-18 02:12:59,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-18 02:12:59,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 54 states have (on average 1.1111111111111112) internal successors, (60), 55 states have internal predecessors, (60), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:12:59,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2022-03-18 02:12:59,794 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 54 [2022-03-18 02:12:59,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:12:59,795 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2022-03-18 02:12:59,795 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 24 states have internal predecessors, (48), 3 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 02:12:59,795 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2022-03-18 02:12:59,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-18 02:12:59,795 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:12:59,795 INFO L500 BasicCegarLoop]: trace histogram [12, 12, 11, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:12:59,821 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-18 02:13:00,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-18 02:13:00,012 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:00,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:00,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1949667502, now seen corresponding path program 11 times [2022-03-18 02:13:00,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:00,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2139242971] [2022-03-18 02:13:00,208 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:00,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1910698194, now seen corresponding path program 1 times [2022-03-18 02:13:00,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:00,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237254451] [2022-03-18 02:13:00,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:00,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:00,214 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:00,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [368431423] [2022-03-18 02:13:00,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:00,215 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:00,215 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:00,216 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:00,218 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-18 02:13:00,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:00,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:00,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:00,308 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:00,308 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:00,308 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:00,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237254451] [2022-03-18 02:13:00,308 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:00,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368431423] [2022-03-18 02:13:00,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368431423] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:00,308 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:00,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:13:01,337 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:13:01,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2139242971] [2022-03-18 02:13:01,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2139242971] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:01,338 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:01,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-18 02:13:01,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749466637] [2022-03-18 02:13:01,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:13:01,338 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-18 02:13:01,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:01,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-18 02:13:01,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2022-03-18 02:13:01,339 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 3 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 02:13:04,014 WARN L534 Checker$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 02:13:04,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:13:04,251 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2022-03-18 02:13:04,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-18 02:13:04,252 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 3 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 57 [2022-03-18 02:13:04,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:13:04,252 INFO L225 Difference]: With dead ends: 91 [2022-03-18 02:13:04,252 INFO L226 Difference]: Without dead ends: 66 [2022-03-18 02:13:04,253 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2022-03-18 02:13:04,254 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 990 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 349 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 990 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-18 02:13:04,254 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 349 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 990 Invalid, 1 Unknown, 0 Unchecked, 2.9s Time] [2022-03-18 02:13:04,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-18 02:13:04,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-03-18 02:13:04,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 57 states have (on average 1.105263157894737) internal successors, (63), 58 states have internal predecessors, (63), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:13:04,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2022-03-18 02:13:04,265 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 57 [2022-03-18 02:13:04,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:13:04,266 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2022-03-18 02:13:04,266 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 3 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 02:13:04,266 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2022-03-18 02:13:04,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-18 02:13:04,266 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:13:04,266 INFO L500 BasicCegarLoop]: trace histogram [13, 13, 12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:13:04,284 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-18 02:13:04,471 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:04,472 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:04,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:04,472 INFO L85 PathProgramCache]: Analyzing trace with hash -993828781, now seen corresponding path program 12 times [2022-03-18 02:13:04,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:04,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [939502281] [2022-03-18 02:13:04,628 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:04,629 INFO L85 PathProgramCache]: Analyzing trace with hash -1298819346, now seen corresponding path program 1 times [2022-03-18 02:13:04,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:04,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511601985] [2022-03-18 02:13:04,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:04,629 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:04,634 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:04,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [631367131] [2022-03-18 02:13:04,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:04,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:04,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:04,635 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:04,660 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-18 02:13:04,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:04,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:04,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:04,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:04,735 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:04,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511601985] [2022-03-18 02:13:04,736 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:04,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631367131] [2022-03-18 02:13:04,736 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631367131] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:04,736 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:04,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:13:05,907 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:13:05,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [939502281] [2022-03-18 02:13:05,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [939502281] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:05,907 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:05,907 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-18 02:13:05,908 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765237788] [2022-03-18 02:13:05,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:13:05,908 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-18 02:13:05,908 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:05,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-18 02:13:05,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2022-03-18 02:13:05,909 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 3 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 02:13:08,673 WARN L534 Checker$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 02:13:10,821 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:12,940 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:15,081 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:17,219 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:17,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:13:17,462 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2022-03-18 02:13:17,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-18 02:13:17,463 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 3 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 60 [2022-03-18 02:13:17,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:13:17,463 INFO L225 Difference]: With dead ends: 94 [2022-03-18 02:13:17,463 INFO L226 Difference]: Without dead ends: 69 [2022-03-18 02:13:17,464 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2022-03-18 02:13:17,464 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 354 mSDsCounter, 0 mSdLazyCounter, 1147 mSolverCounterSat, 0 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 377 SdHoareTripleChecker+Invalid, 1152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1147 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:13:17,464 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 377 Invalid, 1152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1147 Invalid, 5 Unknown, 0 Unchecked, 11.5s Time] [2022-03-18 02:13:17,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-18 02:13:17,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-18 02:13:17,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.1) internal successors, (66), 61 states have internal predecessors, (66), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:13:17,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2022-03-18 02:13:17,474 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 60 [2022-03-18 02:13:17,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:13:17,475 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2022-03-18 02:13:17,475 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.9285714285714286) internal successors, (54), 28 states have internal predecessors, (54), 3 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 02:13:17,475 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2022-03-18 02:13:17,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-18 02:13:17,476 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:13:17,476 INFO L500 BasicCegarLoop]: trace histogram [14, 14, 13, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:13:17,495 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-18 02:13:17,687 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:17,687 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:17,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:17,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1235663950, now seen corresponding path program 13 times [2022-03-18 02:13:17,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:17,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1417048936] [2022-03-18 02:13:17,902 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:17,902 INFO L85 PathProgramCache]: Analyzing trace with hash -686940498, now seen corresponding path program 1 times [2022-03-18 02:13:17,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:17,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219870491] [2022-03-18 02:13:17,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:17,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:17,907 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:17,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774380734] [2022-03-18 02:13:17,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:17,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:17,908 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:17,916 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:17,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-18 02:13:17,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:17,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:17,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:18,004 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:18,005 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:18,005 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:18,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219870491] [2022-03-18 02:13:18,005 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:18,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774380734] [2022-03-18 02:13:18,005 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774380734] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:18,005 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:18,005 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:13:19,441 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:13:19,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1417048936] [2022-03-18 02:13:19,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1417048936] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:19,441 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:19,441 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-18 02:13:19,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757770260] [2022-03-18 02:13:19,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:13:19,442 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-18 02:13:19,442 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:19,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-18 02:13:19,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2022-03-18 02:13:19,443 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 3 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 02:13:22,399 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:24,536 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:26,675 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:28,819 WARN L534 Checker$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 02:13:29,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:13:29,046 INFO L93 Difference]: Finished difference Result 97 states and 108 transitions. [2022-03-18 02:13:29,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-18 02:13:29,047 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 3 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 63 [2022-03-18 02:13:29,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:13:29,048 INFO L225 Difference]: With dead ends: 97 [2022-03-18 02:13:29,048 INFO L226 Difference]: Without dead ends: 72 [2022-03-18 02:13:29,048 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2022-03-18 02:13:29,049 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 1363 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1363 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2022-03-18 02:13:29,049 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 418 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1363 Invalid, 4 Unknown, 0 Unchecked, 9.6s Time] [2022-03-18 02:13:29,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-03-18 02:13:29,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2022-03-18 02:13:29,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 63 states have (on average 1.0952380952380953) internal successors, (69), 64 states have internal predecessors, (69), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:13:29,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2022-03-18 02:13:29,061 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 63 [2022-03-18 02:13:29,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:13:29,062 INFO L478 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2022-03-18 02:13:29,062 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9) internal successors, (57), 30 states have internal predecessors, (57), 3 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 02:13:29,062 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2022-03-18 02:13:29,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-18 02:13:29,062 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:13:29,062 INFO L500 BasicCegarLoop]: trace histogram [15, 15, 14, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:13:29,087 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-03-18 02:13:29,287 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2022-03-18 02:13:29,287 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:29,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:29,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1207939059, now seen corresponding path program 14 times [2022-03-18 02:13:29,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:29,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [902483762] [2022-03-18 02:13:29,431 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:29,431 INFO L85 PathProgramCache]: Analyzing trace with hash -75061650, now seen corresponding path program 1 times [2022-03-18 02:13:29,432 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:29,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791411567] [2022-03-18 02:13:29,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:29,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:29,447 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:29,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [332108378] [2022-03-18 02:13:29,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:29,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:29,449 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:29,450 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:29,452 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-18 02:13:29,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:29,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:29,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:29,568 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:29,568 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:29,568 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:29,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791411567] [2022-03-18 02:13:29,569 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:29,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332108378] [2022-03-18 02:13:29,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332108378] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:29,569 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:29,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:13:31,302 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:13:31,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [902483762] [2022-03-18 02:13:31,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [902483762] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:31,303 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:31,303 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-18 02:13:31,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589140942] [2022-03-18 02:13:31,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:13:31,303 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-18 02:13:31,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:31,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-18 02:13:31,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2022-03-18 02:13:31,304 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 32 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 3 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 02:13:34,265 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:36,402 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:38,564 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:40,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:40,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:13:40,976 INFO L93 Difference]: Finished difference Result 100 states and 111 transitions. [2022-03-18 02:13:40,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-18 02:13:40,976 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 3 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 66 [2022-03-18 02:13:40,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:13:40,977 INFO L225 Difference]: With dead ends: 100 [2022-03-18 02:13:40,977 INFO L226 Difference]: Without dead ends: 75 [2022-03-18 02:13:40,977 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2022-03-18 02:13:40,978 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 1461 mSolverCounterSat, 0 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 1465 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1461 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.6s IncrementalHoareTripleChecker+Time [2022-03-18 02:13:40,978 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 420 Invalid, 1465 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1461 Invalid, 4 Unknown, 0 Unchecked, 9.6s Time] [2022-03-18 02:13:40,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-18 02:13:40,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-18 02:13:40,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 66 states have (on average 1.0909090909090908) internal successors, (72), 67 states have internal predecessors, (72), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:13:40,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 80 transitions. [2022-03-18 02:13:40,989 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 80 transitions. Word has length 66 [2022-03-18 02:13:40,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:13:40,989 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 80 transitions. [2022-03-18 02:13:40,989 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.875) internal successors, (60), 32 states have internal predecessors, (60), 3 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 02:13:40,989 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 80 transitions. [2022-03-18 02:13:40,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-18 02:13:40,990 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:13:40,990 INFO L500 BasicCegarLoop]: trace histogram [16, 16, 15, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:13:41,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-18 02:13:41,190 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:41,190 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:41,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:41,191 INFO L85 PathProgramCache]: Analyzing trace with hash -1110487022, now seen corresponding path program 15 times [2022-03-18 02:13:41,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:41,191 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [251023424] [2022-03-18 02:13:41,425 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:41,426 INFO L85 PathProgramCache]: Analyzing trace with hash 536817198, now seen corresponding path program 1 times [2022-03-18 02:13:41,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:41,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260240446] [2022-03-18 02:13:41,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:41,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:41,431 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:41,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1958393131] [2022-03-18 02:13:41,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:41,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:41,432 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:41,438 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:41,439 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-18 02:13:41,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:41,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:41,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:41,531 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:41,532 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:41,532 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:41,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260240446] [2022-03-18 02:13:41,532 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:41,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958393131] [2022-03-18 02:13:41,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958393131] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:41,532 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:41,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:13:43,891 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:13:43,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [251023424] [2022-03-18 02:13:43,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [251023424] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:43,891 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:43,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-18 02:13:43,891 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580920682] [2022-03-18 02:13:43,891 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:13:43,891 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-18 02:13:43,891 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:43,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-18 02:13:43,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 02:13:43,892 INFO L87 Difference]: Start difference. First operand 75 states and 80 transitions. Second operand has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 34 states have internal predecessors, (63), 3 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 02:13:47,223 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:49,366 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:51,508 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:53,666 WARN L534 Checker$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 02:13:55,821 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:13:57,969 WARN L534 Checker$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 02:13:58,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:13:58,245 INFO L93 Difference]: Finished difference Result 103 states and 114 transitions. [2022-03-18 02:13:58,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-18 02:13:58,246 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 34 states have internal predecessors, (63), 3 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 69 [2022-03-18 02:13:58,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:13:58,247 INFO L225 Difference]: With dead ends: 103 [2022-03-18 02:13:58,247 INFO L226 Difference]: Without dead ends: 78 [2022-03-18 02:13:58,247 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2022-03-18 02:13:58,248 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 438 mSDsCounter, 0 mSdLazyCounter, 1701 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 1707 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1701 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.3s IncrementalHoareTripleChecker+Time [2022-03-18 02:13:58,248 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 461 Invalid, 1707 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1701 Invalid, 6 Unknown, 0 Unchecked, 14.3s Time] [2022-03-18 02:13:58,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-18 02:13:58,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-03-18 02:13:58,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 69 states have (on average 1.0869565217391304) internal successors, (75), 70 states have internal predecessors, (75), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:13:58,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 83 transitions. [2022-03-18 02:13:58,261 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 83 transitions. Word has length 69 [2022-03-18 02:13:58,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:13:58,261 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 83 transitions. [2022-03-18 02:13:58,261 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 34 states have internal predecessors, (63), 3 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 02:13:58,261 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 83 transitions. [2022-03-18 02:13:58,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-03-18 02:13:58,262 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:13:58,262 INFO L500 BasicCegarLoop]: trace histogram [17, 17, 16, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:13:58,278 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-18 02:13:58,462 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:58,462 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:13:58,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:13:58,463 INFO L85 PathProgramCache]: Analyzing trace with hash -1972779117, now seen corresponding path program 16 times [2022-03-18 02:13:58,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:13:58,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [513769044] [2022-03-18 02:13:58,686 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:13:58,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1148696046, now seen corresponding path program 1 times [2022-03-18 02:13:58,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:13:58,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184502713] [2022-03-18 02:13:58,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:58,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:13:58,692 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:13:58,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1387822523] [2022-03-18 02:13:58,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:13:58,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:13:58,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:13:58,696 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:13:58,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-18 02:13:58,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:13:58,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:13:58,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:13:58,791 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:13:58,791 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:13:58,791 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:13:58,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184502713] [2022-03-18 02:13:58,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:13:58,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1387822523] [2022-03-18 02:13:58,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1387822523] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:13:58,791 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:13:58,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:14:01,019 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:14:01,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [513769044] [2022-03-18 02:14:01,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [513769044] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:01,019 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:01,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-18 02:14:01,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132134141] [2022-03-18 02:14:01,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:14:01,020 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-18 02:14:01,020 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:01,020 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-18 02:14:01,021 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2022-03-18 02:14:01,021 INFO L87 Difference]: Start difference. First operand 78 states and 83 transitions. Second operand has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 3 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 02:14:04,472 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:06,609 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:08,752 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:10,901 WARN L534 Checker$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 02:14:13,048 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:15,192 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:17,344 WARN L534 Checker$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 02:14:17,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:14:17,617 INFO L93 Difference]: Finished difference Result 106 states and 117 transitions. [2022-03-18 02:14:17,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-18 02:14:17,617 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 3 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 72 [2022-03-18 02:14:17,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:14:17,618 INFO L225 Difference]: With dead ends: 106 [2022-03-18 02:14:17,618 INFO L226 Difference]: Without dead ends: 81 [2022-03-18 02:14:17,618 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2022-03-18 02:14:17,619 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 1908 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 1915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 1908 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:14:17,619 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 489 Invalid, 1915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 1908 Invalid, 7 Unknown, 0 Unchecked, 16.5s Time] [2022-03-18 02:14:17,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-18 02:14:17,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-18 02:14:17,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 72 states have (on average 1.0833333333333333) internal successors, (78), 73 states have internal predecessors, (78), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:14:17,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 86 transitions. [2022-03-18 02:14:17,632 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 86 transitions. Word has length 72 [2022-03-18 02:14:17,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:14:17,633 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 86 transitions. [2022-03-18 02:14:17,633 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 36 states have internal predecessors, (66), 3 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 02:14:17,633 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 86 transitions. [2022-03-18 02:14:17,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-18 02:14:17,633 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:14:17,634 INFO L500 BasicCegarLoop]: trace histogram [18, 18, 17, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:14:17,653 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-18 02:14:17,839 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-03-18 02:14:17,839 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:14:17,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:14:17,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1977783410, now seen corresponding path program 17 times [2022-03-18 02:14:17,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:17,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1502836546] [2022-03-18 02:14:18,025 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:14:18,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1760574894, now seen corresponding path program 1 times [2022-03-18 02:14:18,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:14:18,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382880070] [2022-03-18 02:14:18,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:18,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:14:18,030 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:14:18,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1468268611] [2022-03-18 02:14:18,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:18,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:14:18,031 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:14:18,038 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:14:18,039 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-18 02:14:18,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:14:18,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:14:18,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:14:18,128 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:14:18,128 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:14:18,128 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:14:18,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382880070] [2022-03-18 02:14:18,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:14:18,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468268611] [2022-03-18 02:14:18,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468268611] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:18,128 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:18,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:14:20,983 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:14:20,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1502836546] [2022-03-18 02:14:20,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1502836546] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:20,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:20,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-18 02:14:20,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282537994] [2022-03-18 02:14:20,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:14:20,984 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-18 02:14:20,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:20,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-18 02:14:20,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2022-03-18 02:14:20,985 INFO L87 Difference]: Start difference. First operand 81 states and 86 transitions. Second operand has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 3 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 02:14:24,506 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 02:14:26,632 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:28,762 WARN L534 Checker$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 02:14:29,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:14:29,065 INFO L93 Difference]: Finished difference Result 109 states and 120 transitions. [2022-03-18 02:14:29,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-18 02:14:29,065 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 3 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 75 [2022-03-18 02:14:29,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:14:29,066 INFO L225 Difference]: With dead ends: 109 [2022-03-18 02:14:29,066 INFO L226 Difference]: Without dead ends: 84 [2022-03-18 02:14:29,067 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2022-03-18 02:14:29,067 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 2080 mSolverCounterSat, 0 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 2083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2080 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:14:29,067 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 504 Invalid, 2083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2080 Invalid, 3 Unknown, 0 Unchecked, 8.0s Time] [2022-03-18 02:14:29,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-03-18 02:14:29,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-03-18 02:14:29,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 75 states have (on average 1.08) internal successors, (81), 76 states have internal predecessors, (81), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:14:29,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 89 transitions. [2022-03-18 02:14:29,078 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 89 transitions. Word has length 75 [2022-03-18 02:14:29,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:14:29,079 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 89 transitions. [2022-03-18 02:14:29,079 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.8157894736842106) internal successors, (69), 38 states have internal predecessors, (69), 3 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 02:14:29,079 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 89 transitions. [2022-03-18 02:14:29,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2022-03-18 02:14:29,079 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:14:29,079 INFO L500 BasicCegarLoop]: trace histogram [19, 19, 18, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:14:29,097 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-18 02:14:29,283 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-03-18 02:14:29,283 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:14:29,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:14:29,284 INFO L85 PathProgramCache]: Analyzing trace with hash -1802787021, now seen corresponding path program 18 times [2022-03-18 02:14:29,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:29,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1039608693] [2022-03-18 02:14:29,495 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:14:29,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1922513554, now seen corresponding path program 1 times [2022-03-18 02:14:29,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:14:29,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962439761] [2022-03-18 02:14:29,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:29,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:14:29,501 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:14:29,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1689126289] [2022-03-18 02:14:29,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:29,501 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:14:29,501 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:14:29,512 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:14:29,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-18 02:14:29,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:14:29,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:14:29,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:14:29,607 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:14:29,608 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:14:29,608 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:14:29,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962439761] [2022-03-18 02:14:29,608 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:14:29,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689126289] [2022-03-18 02:14:29,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689126289] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:29,608 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:29,608 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:14:33,076 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:14:33,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1039608693] [2022-03-18 02:14:33,077 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1039608693] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:33,077 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:33,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-18 02:14:33,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081137934] [2022-03-18 02:14:33,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:14:33,077 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-18 02:14:33,077 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:33,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-18 02:14:33,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2022-03-18 02:14:33,078 INFO L87 Difference]: Start difference. First operand 84 states and 89 transitions. Second operand has 40 states, 40 states have (on average 1.8) internal successors, (72), 40 states have internal predecessors, (72), 3 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 02:14:36,952 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:38,912 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.96s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:39,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:14:39,170 INFO L93 Difference]: Finished difference Result 112 states and 123 transitions. [2022-03-18 02:14:39,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-18 02:14:39,171 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.8) internal successors, (72), 40 states have internal predecessors, (72), 3 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 78 [2022-03-18 02:14:39,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:14:39,171 INFO L225 Difference]: With dead ends: 112 [2022-03-18 02:14:39,171 INFO L226 Difference]: Without dead ends: 87 [2022-03-18 02:14:39,172 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2022-03-18 02:14:39,172 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 535 mSDsCounter, 0 mSdLazyCounter, 2426 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 558 SdHoareTripleChecker+Invalid, 2427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2426 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2022-03-18 02:14:39,172 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 558 Invalid, 2427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2426 Invalid, 1 Unknown, 0 Unchecked, 6.0s Time] [2022-03-18 02:14:39,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-18 02:14:39,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-18 02:14:39,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 78 states have (on average 1.0769230769230769) internal successors, (84), 79 states have internal predecessors, (84), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:14:39,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 92 transitions. [2022-03-18 02:14:39,185 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 92 transitions. Word has length 78 [2022-03-18 02:14:39,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:14:39,185 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 92 transitions. [2022-03-18 02:14:39,185 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.8) internal successors, (72), 40 states have internal predecessors, (72), 3 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 02:14:39,185 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 92 transitions. [2022-03-18 02:14:39,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-18 02:14:39,186 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:14:39,186 INFO L500 BasicCegarLoop]: trace histogram [20, 20, 19, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:14:39,202 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-03-18 02:14:39,386 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-18 02:14:39,387 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:14:39,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:14:39,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1849093934, now seen corresponding path program 19 times [2022-03-18 02:14:39,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:39,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [447257814] [2022-03-18 02:14:39,630 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:14:39,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1310634706, now seen corresponding path program 1 times [2022-03-18 02:14:39,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:14:39,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318166494] [2022-03-18 02:14:39,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:39,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:14:39,635 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:14:39,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [606615728] [2022-03-18 02:14:39,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:14:39,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:14:39,636 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:14:39,638 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:14:39,639 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-18 02:14:39,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:14:39,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:14:39,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:14:39,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:14:39,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:14:39,724 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:14:39,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318166494] [2022-03-18 02:14:39,724 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:14:39,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606615728] [2022-03-18 02:14:39,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606615728] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:39,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:39,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:14:43,561 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:14:43,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [447257814] [2022-03-18 02:14:43,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [447257814] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:14:43,561 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:14:43,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-18 02:14:43,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490363513] [2022-03-18 02:14:43,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:14:43,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-18 02:14:43,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:14:43,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-18 02:14:43,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 02:14:43,563 INFO L87 Difference]: Start difference. First operand 87 states and 92 transitions. Second operand has 42 states, 42 states have (on average 1.7857142857142858) internal successors, (75), 42 states have internal predecessors, (75), 3 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 02:14:47,650 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:49,796 WARN L534 Checker$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 02:14:51,916 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:54,071 WARN L534 Checker$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 02:14:56,217 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:14:58,365 WARN L534 Checker$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 02:15:00,515 WARN L534 Checker$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 02:15:00,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:15:00,775 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2022-03-18 02:15:00,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-18 02:15:00,776 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.7857142857142858) internal successors, (75), 42 states have internal predecessors, (75), 3 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 81 [2022-03-18 02:15:00,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:15:00,776 INFO L225 Difference]: With dead ends: 115 [2022-03-18 02:15:00,776 INFO L226 Difference]: Without dead ends: 90 [2022-03-18 02:15:00,777 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2022-03-18 02:15:00,777 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 2548 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 2555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2548 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 17.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:15:00,777 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 560 Invalid, 2555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2548 Invalid, 7 Unknown, 0 Unchecked, 17.2s Time] [2022-03-18 02:15:00,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-03-18 02:15:00,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2022-03-18 02:15:00,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 81 states have (on average 1.0740740740740742) internal successors, (87), 82 states have internal predecessors, (87), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:15:00,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 95 transitions. [2022-03-18 02:15:00,790 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 95 transitions. Word has length 81 [2022-03-18 02:15:00,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:15:00,791 INFO L478 AbstractCegarLoop]: Abstraction has 90 states and 95 transitions. [2022-03-18 02:15:00,791 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.7857142857142858) internal successors, (75), 42 states have internal predecessors, (75), 3 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 02:15:00,791 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 95 transitions. [2022-03-18 02:15:00,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-03-18 02:15:00,791 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:15:00,791 INFO L500 BasicCegarLoop]: trace histogram [21, 21, 20, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:15:00,808 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-18 02:15:00,992 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:15:00,992 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:15:00,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:15:00,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1601130195, now seen corresponding path program 20 times [2022-03-18 02:15:00,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:15:00,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [464140676] [2022-03-18 02:15:01,121 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:15:01,122 INFO L85 PathProgramCache]: Analyzing trace with hash -698755858, now seen corresponding path program 1 times [2022-03-18 02:15:01,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:15:01,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686142005] [2022-03-18 02:15:01,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:15:01,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:15:01,127 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:15:01,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [409847183] [2022-03-18 02:15:01,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:15:01,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:15:01,127 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:15:01,128 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:15:01,129 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-18 02:15:01,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:15:01,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:15:01,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:15:01,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:15:01,218 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:15:01,218 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:15:01,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686142005] [2022-03-18 02:15:01,218 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:15:01,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409847183] [2022-03-18 02:15:01,219 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409847183] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:15:01,219 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:15:01,219 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:15:05,990 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:15:05,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [464140676] [2022-03-18 02:15:05,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [464140676] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:15:05,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:15:05,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-18 02:15:05,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384637811] [2022-03-18 02:15:05,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:15:05,991 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-18 02:15:05,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:15:05,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-18 02:15:05,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2022-03-18 02:15:05,992 INFO L87 Difference]: Start difference. First operand 90 states and 95 transitions. Second operand has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 3 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 02:15:10,296 WARN L534 Checker$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 02:15:12,441 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:14,590 WARN L534 Checker$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 02:15:16,753 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:18,902 WARN L534 Checker$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 02:15:21,049 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:23,198 WARN L534 Checker$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 02:15:25,352 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:27,496 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:29,649 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:31,798 WARN L534 Checker$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 02:15:32,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:15:32,111 INFO L93 Difference]: Finished difference Result 118 states and 129 transitions. [2022-03-18 02:15:32,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-18 02:15:32,112 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 3 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 84 [2022-03-18 02:15:32,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:15:32,113 INFO L225 Difference]: With dead ends: 118 [2022-03-18 02:15:32,113 INFO L226 Difference]: Without dead ends: 93 [2022-03-18 02:15:32,113 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2022-03-18 02:15:32,114 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 2924 mSolverCounterSat, 0 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 614 SdHoareTripleChecker+Invalid, 2935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2924 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 26.1s IncrementalHoareTripleChecker+Time [2022-03-18 02:15:32,114 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 614 Invalid, 2935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2924 Invalid, 11 Unknown, 0 Unchecked, 26.1s Time] [2022-03-18 02:15:32,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-18 02:15:32,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-18 02:15:32,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 84 states have (on average 1.0714285714285714) internal successors, (90), 85 states have internal predecessors, (90), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:15:32,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2022-03-18 02:15:32,127 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 84 [2022-03-18 02:15:32,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:15:32,127 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2022-03-18 02:15:32,128 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.7727272727272727) internal successors, (78), 44 states have internal predecessors, (78), 3 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 02:15:32,128 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2022-03-18 02:15:32,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-18 02:15:32,128 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:15:32,128 INFO L500 BasicCegarLoop]: trace histogram [22, 22, 21, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:15:32,147 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-18 02:15:32,331 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-03-18 02:15:32,331 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:15:32,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:15:32,332 INFO L85 PathProgramCache]: Analyzing trace with hash 70829362, now seen corresponding path program 21 times [2022-03-18 02:15:32,332 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:15:32,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1187375496] [2022-03-18 02:15:32,571 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:15:32,572 INFO L85 PathProgramCache]: Analyzing trace with hash -86877010, now seen corresponding path program 1 times [2022-03-18 02:15:32,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:15:32,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958055646] [2022-03-18 02:15:32,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:15:32,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:15:32,576 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:15:32,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1420476004] [2022-03-18 02:15:32,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:15:32,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:15:32,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:15:32,580 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:15:32,606 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-18 02:15:32,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:15:32,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:15:32,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:15:32,694 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:15:32,695 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:15:32,695 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:15:32,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958055646] [2022-03-18 02:15:32,695 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:15:32,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420476004] [2022-03-18 02:15:32,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420476004] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:15:32,695 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:15:32,695 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:15:38,341 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:15:38,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1187375496] [2022-03-18 02:15:38,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1187375496] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:15:38,342 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:15:38,342 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-18 02:15:38,342 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316734542] [2022-03-18 02:15:38,342 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:15:38,342 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-18 02:15:38,342 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:15:38,342 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-18 02:15:38,343 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 02:15:38,343 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand has 46 states, 46 states have (on average 1.7608695652173914) internal successors, (81), 46 states have internal predecessors, (81), 3 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 02:15:43,071 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:45,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:47,361 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:49,512 WARN L534 Checker$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 02:15:51,672 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:53,796 WARN L534 Checker$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 02:15:55,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:15:58,062 WARN L534 Checker$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 02:16:00,214 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:02,357 WARN L534 Checker$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 02:16:02,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:16:02,661 INFO L93 Difference]: Finished difference Result 121 states and 132 transitions. [2022-03-18 02:16:02,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-18 02:16:02,662 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.7608695652173914) internal successors, (81), 46 states have internal predecessors, (81), 3 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 87 [2022-03-18 02:16:02,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:16:02,662 INFO L225 Difference]: With dead ends: 121 [2022-03-18 02:16:02,662 INFO L226 Difference]: Without dead ends: 96 [2022-03-18 02:16:02,663 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=91, Invalid=1979, Unknown=0, NotChecked=0, Total=2070 [2022-03-18 02:16:02,663 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 619 mSDsCounter, 0 mSdLazyCounter, 3197 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 22.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 3207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3197 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 24.3s IncrementalHoareTripleChecker+Time [2022-03-18 02:16:02,663 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 642 Invalid, 3207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3197 Invalid, 10 Unknown, 0 Unchecked, 24.3s Time] [2022-03-18 02:16:02,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-03-18 02:16:02,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2022-03-18 02:16:02,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 87 states have (on average 1.0689655172413792) internal successors, (93), 88 states have internal predecessors, (93), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:16:02,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 101 transitions. [2022-03-18 02:16:02,676 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 101 transitions. Word has length 87 [2022-03-18 02:16:02,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:16:02,676 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 101 transitions. [2022-03-18 02:16:02,677 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.7608695652173914) internal successors, (81), 46 states have internal predecessors, (81), 3 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 02:16:02,677 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 101 transitions. [2022-03-18 02:16:02,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-03-18 02:16:02,677 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:16:02,677 INFO L500 BasicCegarLoop]: trace histogram [23, 23, 22, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:16:02,694 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-03-18 02:16:02,877 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-18 02:16:02,878 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:16:02,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:16:02,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1956560499, now seen corresponding path program 22 times [2022-03-18 02:16:02,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:16:02,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1964142333] [2022-03-18 02:16:03,071 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:16:03,072 INFO L85 PathProgramCache]: Analyzing trace with hash 525001838, now seen corresponding path program 1 times [2022-03-18 02:16:03,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:16:03,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818593960] [2022-03-18 02:16:03,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:03,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:16:03,077 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:16:03,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1717447067] [2022-03-18 02:16:03,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:03,077 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:16:03,078 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:16:03,079 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:16:03,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-18 02:16:03,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:16:03,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:16:03,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:16:03,167 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:16:03,167 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:16:03,167 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:16:03,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818593960] [2022-03-18 02:16:03,167 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:16:03,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717447067] [2022-03-18 02:16:03,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717447067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:16:03,168 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:16:03,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:16:09,230 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:16:09,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1964142333] [2022-03-18 02:16:09,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1964142333] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:16:09,231 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:16:09,231 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-18 02:16:09,231 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774452995] [2022-03-18 02:16:09,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:16:09,231 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-18 02:16:09,231 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:16:09,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-18 02:16:09,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=2161, Unknown=0, NotChecked=0, Total=2256 [2022-03-18 02:16:09,232 INFO L87 Difference]: Start difference. First operand 96 states and 101 transitions. Second operand has 48 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 3 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 02:16:14,468 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:16,584 WARN L534 Checker$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 02:16:18,700 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.12s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:20,831 WARN L534 Checker$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 02:16:22,965 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:25,119 WARN L534 Checker$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 02:16:27,289 WARN L534 Checker$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 02:16:27,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:16:27,609 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2022-03-18 02:16:27,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-18 02:16:27,610 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 3 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 90 [2022-03-18 02:16:27,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:16:27,610 INFO L225 Difference]: With dead ends: 124 [2022-03-18 02:16:27,610 INFO L226 Difference]: Without dead ends: 99 [2022-03-18 02:16:27,611 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=95, Invalid=2161, Unknown=0, NotChecked=0, Total=2256 [2022-03-18 02:16:27,611 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 647 mSDsCounter, 0 mSdLazyCounter, 3484 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 16.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 3491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3484 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 18.3s IncrementalHoareTripleChecker+Time [2022-03-18 02:16:27,611 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 670 Invalid, 3491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3484 Invalid, 7 Unknown, 0 Unchecked, 18.3s Time] [2022-03-18 02:16:27,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-18 02:16:27,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-18 02:16:27,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 90 states have (on average 1.0666666666666667) internal successors, (96), 91 states have internal predecessors, (96), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:16:27,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 104 transitions. [2022-03-18 02:16:27,628 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 104 transitions. Word has length 90 [2022-03-18 02:16:27,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:16:27,628 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 104 transitions. [2022-03-18 02:16:27,628 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.75) internal successors, (84), 48 states have internal predecessors, (84), 3 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 02:16:27,629 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 104 transitions. [2022-03-18 02:16:27,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-18 02:16:27,629 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:16:27,629 INFO L500 BasicCegarLoop]: trace histogram [24, 24, 23, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:16:27,646 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-18 02:16:27,829 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:16:27,830 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:16:27,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:16:27,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1600631186, now seen corresponding path program 23 times [2022-03-18 02:16:27,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:16:27,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1653556523] [2022-03-18 02:16:27,965 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:16:27,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1136880686, now seen corresponding path program 1 times [2022-03-18 02:16:27,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:16:27,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286640598] [2022-03-18 02:16:27,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:27,965 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:16:27,969 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:16:27,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1262732153] [2022-03-18 02:16:27,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:27,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:16:27,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:16:27,971 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:16:27,988 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-18 02:16:28,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:16:28,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:16:28,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:16:28,072 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:16:28,072 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:16:28,072 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:16:28,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286640598] [2022-03-18 02:16:28,073 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:16:28,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262732153] [2022-03-18 02:16:28,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262732153] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:16:28,073 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:16:28,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:16:36,082 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:16:36,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1653556523] [2022-03-18 02:16:36,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1653556523] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:16:36,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:16:36,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-18 02:16:36,083 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594399542] [2022-03-18 02:16:36,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:16:36,083 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-18 02:16:36,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:16:36,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-18 02:16:36,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2022-03-18 02:16:36,084 INFO L87 Difference]: Start difference. First operand 99 states and 104 transitions. Second operand has 50 states, 50 states have (on average 1.74) internal successors, (87), 50 states have internal predecessors, (87), 3 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 02:16:41,405 WARN L534 Checker$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 02:16:43,530 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:45,707 WARN L534 Checker$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 02:16:47,864 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:51,090 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.22s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:53,246 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:55,402 WARN L534 Checker$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 02:16:57,546 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.14s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:16:57,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:16:57,913 INFO L93 Difference]: Finished difference Result 127 states and 138 transitions. [2022-03-18 02:16:57,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-18 02:16:57,914 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.74) internal successors, (87), 50 states have internal predecessors, (87), 3 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 93 [2022-03-18 02:16:57,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:16:57,915 INFO L225 Difference]: With dead ends: 127 [2022-03-18 02:16:57,915 INFO L226 Difference]: Without dead ends: 102 [2022-03-18 02:16:57,916 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=99, Invalid=2351, Unknown=0, NotChecked=0, Total=2450 [2022-03-18 02:16:57,916 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 649 mSDsCounter, 0 mSdLazyCounter, 3635 mSolverCounterSat, 0 mSolverCounterUnsat, 8 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 672 SdHoareTripleChecker+Invalid, 3643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 3635 IncrementalHoareTripleChecker+Invalid, 8 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 21.8s IncrementalHoareTripleChecker+Time [2022-03-18 02:16:57,916 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 672 Invalid, 3643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 3635 Invalid, 8 Unknown, 0 Unchecked, 21.8s Time] [2022-03-18 02:16:57,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-18 02:16:57,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 102. [2022-03-18 02:16:57,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 93 states have (on average 1.064516129032258) internal successors, (99), 94 states have internal predecessors, (99), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:16:57,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 107 transitions. [2022-03-18 02:16:57,937 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 107 transitions. Word has length 93 [2022-03-18 02:16:57,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:16:57,938 INFO L478 AbstractCegarLoop]: Abstraction has 102 states and 107 transitions. [2022-03-18 02:16:57,938 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.74) internal successors, (87), 50 states have internal predecessors, (87), 3 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 02:16:57,938 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 107 transitions. [2022-03-18 02:16:57,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-03-18 02:16:57,938 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:16:57,938 INFO L500 BasicCegarLoop]: trace histogram [25, 25, 24, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:16:57,963 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-03-18 02:16:58,159 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-03-18 02:16:58,160 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:16:58,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:16:58,160 INFO L85 PathProgramCache]: Analyzing trace with hash -1910245869, now seen corresponding path program 24 times [2022-03-18 02:16:58,160 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:16:58,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [785301174] [2022-03-18 02:16:58,448 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:16:58,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1748759534, now seen corresponding path program 1 times [2022-03-18 02:16:58,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:16:58,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443302584] [2022-03-18 02:16:58,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:58,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:16:58,453 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:16:58,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1034521321] [2022-03-18 02:16:58,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:16:58,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:16:58,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:16:58,457 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:16:58,458 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-18 02:16:58,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:16:58,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:16:58,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:16:58,571 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:16:58,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:16:58,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:16:58,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443302584] [2022-03-18 02:16:58,572 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:16:58,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1034521321] [2022-03-18 02:16:58,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1034521321] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:16:58,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:16:58,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:17:09,069 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:17:09,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [785301174] [2022-03-18 02:17:09,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [785301174] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:17:09,070 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:17:09,070 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-18 02:17:09,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321774409] [2022-03-18 02:17:09,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:17:09,070 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-18 02:17:09,070 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:17:09,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-18 02:17:09,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2022-03-18 02:17:09,072 INFO L87 Difference]: Start difference. First operand 102 states and 107 transitions. Second operand has 52 states, 52 states have (on average 1.7307692307692308) internal successors, (90), 52 states have internal predecessors, (90), 3 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 02:17:16,590 WARN L534 Checker$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 02:17:18,743 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:20,889 WARN L534 Checker$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 02:17:23,042 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:25,195 WARN L534 Checker$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 02:17:27,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:29,513 WARN L534 Checker$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 02:17:31,670 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:33,831 WARN L534 Checker$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 02:17:35,988 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:38,167 WARN L534 Checker$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 02:17:40,319 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 02:17:40,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:17:40,678 INFO L93 Difference]: Finished difference Result 130 states and 141 transitions. [2022-03-18 02:17:40,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-18 02:17:40,679 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.7307692307692308) internal successors, (90), 52 states have internal predecessors, (90), 3 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 96 [2022-03-18 02:17:40,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:17:40,679 INFO L225 Difference]: With dead ends: 130 [2022-03-18 02:17:40,680 INFO L226 Difference]: Without dead ends: 105 [2022-03-18 02:17:40,680 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=103, Invalid=2549, Unknown=0, NotChecked=0, Total=2652 [2022-03-18 02:17:40,681 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 690 mSDsCounter, 0 mSdLazyCounter, 4008 mSolverCounterSat, 0 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 4020 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4008 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 31.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:17:40,681 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 713 Invalid, 4020 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4008 Invalid, 12 Unknown, 0 Unchecked, 31.5s Time] [2022-03-18 02:17:40,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-18 02:17:40,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-03-18 02:17:40,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 96 states have (on average 1.0625) internal successors, (102), 97 states have internal predecessors, (102), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:17:40,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2022-03-18 02:17:40,700 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 96 [2022-03-18 02:17:40,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:17:40,700 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2022-03-18 02:17:40,701 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.7307692307692308) internal successors, (90), 52 states have internal predecessors, (90), 3 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 02:17:40,701 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2022-03-18 02:17:40,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-03-18 02:17:40,701 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:17:40,701 INFO L500 BasicCegarLoop]: trace histogram [26, 26, 25, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:17:40,724 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-03-18 02:17:40,919 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:17:40,919 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:17:40,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:17:40,920 INFO L85 PathProgramCache]: Analyzing trace with hash 889968114, now seen corresponding path program 25 times [2022-03-18 02:17:40,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:17:40,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1425338164] [2022-03-18 02:17:41,079 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:17:41,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1934328914, now seen corresponding path program 1 times [2022-03-18 02:17:41,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:17:41,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422574106] [2022-03-18 02:17:41,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:17:41,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:17:41,084 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:17:41,085 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1160672389] [2022-03-18 02:17:41,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:17:41,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:17:41,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:17:41,086 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:17:41,087 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-18 02:17:41,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:17:41,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:17:41,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:17:41,177 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:17:41,177 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:17:41,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:17:41,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422574106] [2022-03-18 02:17:41,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:17:41,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160672389] [2022-03-18 02:17:41,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160672389] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:17:41,178 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:17:41,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:17:49,120 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:17:49,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1425338164] [2022-03-18 02:17:49,120 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1425338164] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:17:49,120 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:17:49,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-03-18 02:17:49,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033855978] [2022-03-18 02:17:49,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:17:49,121 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-03-18 02:17:49,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:17:49,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-03-18 02:17:49,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2022-03-18 02:17:49,122 INFO L87 Difference]: Start difference. First operand 105 states and 110 transitions. Second operand has 54 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 54 states have internal predecessors, (93), 3 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 02:17:55,135 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:57,254 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:17:59,404 WARN L534 Checker$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 02:18:01,517 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.11s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:03,650 WARN L534 Checker$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 02:18:05,801 WARN L534 Checker$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 02:18:06,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:18:06,127 INFO L93 Difference]: Finished difference Result 133 states and 144 transitions. [2022-03-18 02:18:06,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-03-18 02:18:06,128 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 54 states have internal predecessors, (93), 3 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 99 [2022-03-18 02:18:06,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:18:06,129 INFO L225 Difference]: With dead ends: 133 [2022-03-18 02:18:06,129 INFO L226 Difference]: Without dead ends: 108 [2022-03-18 02:18:06,130 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=107, Invalid=2755, Unknown=0, NotChecked=0, Total=2862 [2022-03-18 02:18:06,130 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 718 mSDsCounter, 0 mSdLazyCounter, 4331 mSolverCounterSat, 0 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 741 SdHoareTripleChecker+Invalid, 4337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4331 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.9s IncrementalHoareTripleChecker+Time [2022-03-18 02:18:06,130 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 741 Invalid, 4337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4331 Invalid, 6 Unknown, 0 Unchecked, 16.9s Time] [2022-03-18 02:18:06,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-18 02:18:06,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2022-03-18 02:18:06,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 99 states have (on average 1.0606060606060606) internal successors, (105), 100 states have internal predecessors, (105), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:18:06,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 113 transitions. [2022-03-18 02:18:06,148 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 113 transitions. Word has length 99 [2022-03-18 02:18:06,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:18:06,149 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 113 transitions. [2022-03-18 02:18:06,149 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.7222222222222223) internal successors, (93), 54 states have internal predecessors, (93), 3 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 02:18:06,149 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 113 transitions. [2022-03-18 02:18:06,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2022-03-18 02:18:06,149 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:18:06,150 INFO L500 BasicCegarLoop]: trace histogram [27, 27, 26, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:18:06,166 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-03-18 02:18:06,350 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:18:06,350 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:18:06,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:18:06,351 INFO L85 PathProgramCache]: Analyzing trace with hash 914945459, now seen corresponding path program 26 times [2022-03-18 02:18:06,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:18:06,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [493043726] [2022-03-18 02:18:06,542 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:18:06,543 INFO L85 PathProgramCache]: Analyzing trace with hash -1322450066, now seen corresponding path program 1 times [2022-03-18 02:18:06,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:18:06,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627834517] [2022-03-18 02:18:06,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:18:06,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:18:06,546 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:18:06,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [344964014] [2022-03-18 02:18:06,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:18:06,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:18:06,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:18:06,552 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:18:06,552 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-18 02:18:06,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:18:06,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:18:06,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:18:06,634 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:18:06,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:18:06,635 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:18:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627834517] [2022-03-18 02:18:06,635 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:18:06,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344964014] [2022-03-18 02:18:06,635 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344964014] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:18:06,635 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:18:06,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:18:16,991 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:18:16,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [493043726] [2022-03-18 02:18:16,991 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [493043726] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:18:16,991 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:18:16,991 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-03-18 02:18:16,991 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725163273] [2022-03-18 02:18:16,991 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:18:16,991 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-03-18 02:18:16,992 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:18:16,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-03-18 02:18:16,992 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2022-03-18 02:18:16,993 INFO L87 Difference]: Start difference. First operand 108 states and 113 transitions. Second operand has 56 states, 56 states have (on average 1.7142857142857142) internal successors, (96), 56 states have internal predecessors, (96), 3 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 02:18:25,876 WARN L534 Checker$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 02:18:28,031 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:30,190 WARN L534 Checker$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 02:18:32,346 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:34,501 WARN L534 Checker$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 02:18:36,656 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:38,827 WARN L534 Checker$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 02:18:40,954 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:43,084 WARN L534 Checker$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 02:18:45,216 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:47,367 WARN L534 Checker$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 02:18:49,535 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:51,687 WARN L534 Checker$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 02:18:53,842 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.15s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:18:55,994 WARN L534 Checker$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 02:18:58,153 WARN L534 Checker$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 02:18:58,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:18:58,580 INFO L93 Difference]: Finished difference Result 136 states and 147 transitions. [2022-03-18 02:18:58,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-03-18 02:18:58,581 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.7142857142857142) internal successors, (96), 56 states have internal predecessors, (96), 3 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 102 [2022-03-18 02:18:58,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:18:58,582 INFO L225 Difference]: With dead ends: 136 [2022-03-18 02:18:58,582 INFO L226 Difference]: Without dead ends: 111 [2022-03-18 02:18:58,582 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=111, Invalid=2969, Unknown=0, NotChecked=0, Total=3080 [2022-03-18 02:18:58,582 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 733 mSDsCounter, 0 mSdLazyCounter, 4569 mSolverCounterSat, 0 mSolverCounterUnsat, 16 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 37.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 756 SdHoareTripleChecker+Invalid, 4585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4569 IncrementalHoareTripleChecker+Invalid, 16 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 41.5s IncrementalHoareTripleChecker+Time [2022-03-18 02:18:58,583 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 756 Invalid, 4585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4569 Invalid, 16 Unknown, 0 Unchecked, 41.5s Time] [2022-03-18 02:18:58,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-18 02:18:58,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-03-18 02:18:58,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 102 states have (on average 1.0588235294117647) internal successors, (108), 103 states have internal predecessors, (108), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:18:58,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 116 transitions. [2022-03-18 02:18:58,598 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 116 transitions. Word has length 102 [2022-03-18 02:18:58,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:18:58,599 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 116 transitions. [2022-03-18 02:18:58,599 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.7142857142857142) internal successors, (96), 56 states have internal predecessors, (96), 3 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 02:18:58,599 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 116 transitions. [2022-03-18 02:18:58,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-18 02:18:58,599 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:18:58,599 INFO L500 BasicCegarLoop]: trace histogram [28, 28, 27, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:18:58,621 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-03-18 02:18:58,800 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-03-18 02:18:58,800 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:18:58,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:18:58,800 INFO L85 PathProgramCache]: Analyzing trace with hash 1985688146, now seen corresponding path program 27 times [2022-03-18 02:18:58,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:18:58,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1349055604] [2022-03-18 02:18:59,028 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:18:59,028 INFO L85 PathProgramCache]: Analyzing trace with hash -710571218, now seen corresponding path program 1 times [2022-03-18 02:18:59,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:18:59,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563435355] [2022-03-18 02:18:59,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:18:59,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:18:59,032 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:18:59,033 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [91893194] [2022-03-18 02:18:59,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:18:59,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:18:59,033 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:18:59,034 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:18:59,035 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-18 02:18:59,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:18:59,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:18:59,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:18:59,132 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:18:59,132 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:18:59,132 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:18:59,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563435355] [2022-03-18 02:18:59,133 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:18:59,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91893194] [2022-03-18 02:18:59,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91893194] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:18:59,133 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:18:59,133 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:19:19,027 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:19:19,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1349055604] [2022-03-18 02:19:19,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1349055604] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:19:19,027 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:19:19,027 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-03-18 02:19:19,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100752146] [2022-03-18 02:19:19,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:19:19,028 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-03-18 02:19:19,028 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:19:19,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-03-18 02:19:19,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=3191, Unknown=0, NotChecked=0, Total=3306 [2022-03-18 02:19:19,028 INFO L87 Difference]: Start difference. First operand 111 states and 116 transitions. Second operand has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 58 states have internal predecessors, (99), 3 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 02:19:28,917 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:19:31,083 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:19:33,247 WARN L534 Checker$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 02:19:35,417 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:19:37,579 WARN L534 Checker$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 02:19:39,736 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:19:41,895 WARN L534 Checker$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 02:19:42,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:19:42,334 INFO L93 Difference]: Finished difference Result 139 states and 150 transitions. [2022-03-18 02:19:42,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-03-18 02:19:42,335 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 58 states have internal predecessors, (99), 3 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 105 [2022-03-18 02:19:42,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:19:42,336 INFO L225 Difference]: With dead ends: 139 [2022-03-18 02:19:42,336 INFO L226 Difference]: Without dead ends: 114 [2022-03-18 02:19:42,337 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 19.8s TimeCoverageRelationStatistics Valid=115, Invalid=3191, Unknown=0, NotChecked=0, Total=3306 [2022-03-18 02:19:42,337 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 774 mSDsCounter, 0 mSdLazyCounter, 5000 mSolverCounterSat, 0 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 20.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 797 SdHoareTripleChecker+Invalid, 5007 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5000 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 23.2s IncrementalHoareTripleChecker+Time [2022-03-18 02:19:42,337 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 797 Invalid, 5007 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5000 Invalid, 7 Unknown, 0 Unchecked, 23.2s Time] [2022-03-18 02:19:42,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-18 02:19:42,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2022-03-18 02:19:42,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 105 states have (on average 1.0571428571428572) internal successors, (111), 106 states have internal predecessors, (111), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:19:42,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2022-03-18 02:19:42,359 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 105 [2022-03-18 02:19:42,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:19:42,359 INFO L478 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2022-03-18 02:19:42,359 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.706896551724138) internal successors, (99), 58 states have internal predecessors, (99), 3 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 02:19:42,359 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2022-03-18 02:19:42,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-03-18 02:19:42,360 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:19:42,360 INFO L500 BasicCegarLoop]: trace histogram [29, 29, 28, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:19:42,385 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-18 02:19:42,583 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-03-18 02:19:42,584 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:19:42,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:19:42,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1758969171, now seen corresponding path program 28 times [2022-03-18 02:19:42,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:19:42,584 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [675727946] [2022-03-18 02:19:42,824 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:19:42,824 INFO L85 PathProgramCache]: Analyzing trace with hash -98692370, now seen corresponding path program 1 times [2022-03-18 02:19:42,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:19:42,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [350488240] [2022-03-18 02:19:42,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:19:42,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:19:42,828 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:19:42,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1052994748] [2022-03-18 02:19:42,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:19:42,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:19:42,829 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:19:42,832 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:19:42,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-18 02:19:42,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:19:42,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:19:42,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:19:42,932 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:19:42,932 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:19:42,933 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:19:42,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [350488240] [2022-03-18 02:19:42,933 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:19:42,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052994748] [2022-03-18 02:19:42,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052994748] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:19:42,933 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:19:42,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:20:05,723 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:20:05,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [675727946] [2022-03-18 02:20:05,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [675727946] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:20:05,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:20:05,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [60] imperfect sequences [] total 60 [2022-03-18 02:20:05,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347457040] [2022-03-18 02:20:05,724 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:20:05,724 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-03-18 02:20:05,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:20:05,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-03-18 02:20:05,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3421, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 02:20:05,725 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand has 60 states, 60 states have (on average 1.7) internal successors, (102), 60 states have internal predecessors, (102), 3 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 02:20:16,653 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:18,807 WARN L534 Checker$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 02:20:20,989 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:23,154 WARN L534 Checker$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 02:20:25,316 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:27,511 WARN L534 Checker$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 02:20:29,675 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:31,845 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:34,007 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:20:36,166 WARN L534 Checker$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 02:20:36,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:20:36,635 INFO L93 Difference]: Finished difference Result 142 states and 153 transitions. [2022-03-18 02:20:36,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-03-18 02:20:36,636 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.7) internal successors, (102), 60 states have internal predecessors, (102), 3 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 108 [2022-03-18 02:20:36,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:20:36,637 INFO L225 Difference]: With dead ends: 142 [2022-03-18 02:20:36,637 INFO L226 Difference]: Without dead ends: 117 [2022-03-18 02:20:36,637 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=119, Invalid=3421, Unknown=0, NotChecked=0, Total=3540 [2022-03-18 02:20:36,637 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 5437 mSolverCounterSat, 0 mSolverCounterUnsat, 10 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 27.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 838 SdHoareTripleChecker+Invalid, 5447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5437 IncrementalHoareTripleChecker+Invalid, 10 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.8s IncrementalHoareTripleChecker+Time [2022-03-18 02:20:36,637 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 838 Invalid, 5447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5437 Invalid, 10 Unknown, 0 Unchecked, 30.8s Time] [2022-03-18 02:20:36,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-03-18 02:20:36,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2022-03-18 02:20:36,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 108 states have (on average 1.0555555555555556) internal successors, (114), 109 states have internal predecessors, (114), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:20:36,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 122 transitions. [2022-03-18 02:20:36,663 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 122 transitions. Word has length 108 [2022-03-18 02:20:36,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:20:36,664 INFO L478 AbstractCegarLoop]: Abstraction has 117 states and 122 transitions. [2022-03-18 02:20:36,664 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.7) internal successors, (102), 60 states have internal predecessors, (102), 3 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 02:20:36,664 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 122 transitions. [2022-03-18 02:20:36,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-03-18 02:20:36,666 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:20:36,666 INFO L500 BasicCegarLoop]: trace histogram [30, 30, 29, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:20:36,684 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-03-18 02:20:36,871 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-03-18 02:20:36,871 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:20:36,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:20:36,872 INFO L85 PathProgramCache]: Analyzing trace with hash -737425742, now seen corresponding path program 29 times [2022-03-18 02:20:36,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:20:36,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [459150324] [2022-03-18 02:20:37,131 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:20:37,131 INFO L85 PathProgramCache]: Analyzing trace with hash 513186478, now seen corresponding path program 1 times [2022-03-18 02:20:37,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:20:37,131 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491259638] [2022-03-18 02:20:37,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:20:37,131 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:20:37,136 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:20:37,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1384212234] [2022-03-18 02:20:37,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:20:37,136 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:20:37,137 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:20:37,140 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:20:37,158 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-18 02:20:37,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:20:37,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:20:37,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:20:37,260 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:20:37,260 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:20:37,261 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:20:37,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491259638] [2022-03-18 02:20:37,261 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:20:37,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384212234] [2022-03-18 02:20:37,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384212234] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:20:37,261 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:20:37,261 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:21:03,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:21:03,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [459150324] [2022-03-18 02:21:03,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [459150324] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:21:03,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:21:03,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [62] imperfect sequences [] total 62 [2022-03-18 02:21:03,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129969431] [2022-03-18 02:21:03,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:21:03,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-03-18 02:21:03,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:21:03,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-03-18 02:21:03,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=3659, Unknown=0, NotChecked=0, Total=3782 [2022-03-18 02:21:03,730 INFO L87 Difference]: Start difference. First operand 117 states and 122 transitions. Second operand has 62 states, 62 states have (on average 1.6935483870967742) internal successors, (105), 62 states have internal predecessors, (105), 3 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 02:21:15,569 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:17,755 WARN L534 Checker$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 02:21:19,938 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:22,110 WARN L534 Checker$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 02:21:24,273 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:26,444 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:28,645 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.20s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:30,817 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:21:32,975 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 02:21:33,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:21:33,440 INFO L93 Difference]: Finished difference Result 145 states and 156 transitions. [2022-03-18 02:21:33,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-03-18 02:21:33,441 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.6935483870967742) internal successors, (105), 62 states have internal predecessors, (105), 3 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 111 [2022-03-18 02:21:33,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:21:33,442 INFO L225 Difference]: With dead ends: 145 [2022-03-18 02:21:33,442 INFO L226 Difference]: Without dead ends: 120 [2022-03-18 02:21:33,442 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=123, Invalid=3659, Unknown=0, NotChecked=0, Total=3782 [2022-03-18 02:21:33,443 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 843 mSDsCounter, 0 mSdLazyCounter, 5806 mSolverCounterSat, 0 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 26.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 866 SdHoareTripleChecker+Invalid, 5815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5806 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.6s IncrementalHoareTripleChecker+Time [2022-03-18 02:21:33,443 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 866 Invalid, 5815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5806 Invalid, 9 Unknown, 0 Unchecked, 29.6s Time] [2022-03-18 02:21:33,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2022-03-18 02:21:33,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2022-03-18 02:21:33,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 111 states have (on average 1.054054054054054) internal successors, (117), 112 states have internal predecessors, (117), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:21:33,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 125 transitions. [2022-03-18 02:21:33,458 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 125 transitions. Word has length 111 [2022-03-18 02:21:33,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:21:33,458 INFO L478 AbstractCegarLoop]: Abstraction has 120 states and 125 transitions. [2022-03-18 02:21:33,458 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.6935483870967742) internal successors, (105), 62 states have internal predecessors, (105), 3 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 02:21:33,458 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 125 transitions. [2022-03-18 02:21:33,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-03-18 02:21:33,459 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:21:33,459 INFO L500 BasicCegarLoop]: trace histogram [31, 31, 30, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:21:33,480 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-03-18 02:21:33,659 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:21:33,660 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:21:33,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:21:33,660 INFO L85 PathProgramCache]: Analyzing trace with hash 815418611, now seen corresponding path program 30 times [2022-03-18 02:21:33,660 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:21:33,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [868782113] [2022-03-18 02:21:33,943 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:21:33,943 INFO L85 PathProgramCache]: Analyzing trace with hash 1125065326, now seen corresponding path program 1 times [2022-03-18 02:21:33,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:21:33,943 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222212336] [2022-03-18 02:21:33,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:21:33,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:21:33,948 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:21:33,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1432210104] [2022-03-18 02:21:33,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:21:33,949 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:21:33,949 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:21:33,956 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:21:33,967 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-18 02:21:33,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:21:33,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:21:33,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:21:34,053 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:21:34,053 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:21:34,053 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:21:34,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222212336] [2022-03-18 02:21:34,053 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:21:34,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1432210104] [2022-03-18 02:21:34,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1432210104] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:21:34,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:21:34,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:22:07,310 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:22:07,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [868782113] [2022-03-18 02:22:07,311 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [868782113] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:22:07,311 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:22:07,311 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [64] imperfect sequences [] total 64 [2022-03-18 02:22:07,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224862028] [2022-03-18 02:22:07,311 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:22:07,312 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-03-18 02:22:07,312 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:22:07,312 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-03-18 02:22:07,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 02:22:07,312 INFO L87 Difference]: Start difference. First operand 120 states and 125 transitions. Second operand has 64 states, 64 states have (on average 1.6875) internal successors, (108), 64 states have internal predecessors, (108), 3 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 02:22:20,921 WARN L534 Checker$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 02:22:23,053 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.13s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:22:25,208 WARN L534 Checker$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 02:22:27,378 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:22:29,537 WARN L534 Checker$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 02:22:31,721 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:22:33,886 WARN L534 Checker$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 02:22:36,050 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:22:38,211 WARN L534 Checker$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 02:22:40,374 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:22:42,534 WARN L534 Checker$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 02:22:44,702 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 02:22:45,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:22:45,263 INFO L93 Difference]: Finished difference Result 148 states and 159 transitions. [2022-03-18 02:22:45,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-03-18 02:22:45,264 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.6875) internal successors, (108), 64 states have internal predecessors, (108), 3 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 114 [2022-03-18 02:22:45,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:22:45,265 INFO L225 Difference]: With dead ends: 148 [2022-03-18 02:22:45,265 INFO L226 Difference]: Without dead ends: 123 [2022-03-18 02:22:45,265 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 33.1s TimeCoverageRelationStatistics Valid=127, Invalid=3905, Unknown=0, NotChecked=0, Total=4032 [2022-03-18 02:22:45,266 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 871 mSDsCounter, 0 mSdLazyCounter, 6183 mSolverCounterSat, 0 mSolverCounterUnsat, 12 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 894 SdHoareTripleChecker+Invalid, 6195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6183 IncrementalHoareTripleChecker+Invalid, 12 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 37.8s IncrementalHoareTripleChecker+Time [2022-03-18 02:22:45,266 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 894 Invalid, 6195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6183 Invalid, 12 Unknown, 0 Unchecked, 37.8s Time] [2022-03-18 02:22:45,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2022-03-18 02:22:45,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2022-03-18 02:22:45,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 114 states have (on average 1.0526315789473684) internal successors, (120), 115 states have internal predecessors, (120), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:22:45,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 128 transitions. [2022-03-18 02:22:45,303 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 128 transitions. Word has length 114 [2022-03-18 02:22:45,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:22:45,304 INFO L478 AbstractCegarLoop]: Abstraction has 123 states and 128 transitions. [2022-03-18 02:22:45,304 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.6875) internal successors, (108), 64 states have internal predecessors, (108), 3 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 02:22:45,304 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 128 transitions. [2022-03-18 02:22:45,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-03-18 02:22:45,304 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:22:45,304 INFO L500 BasicCegarLoop]: trace histogram [32, 32, 31, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:22:45,324 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-03-18 02:22:45,505 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-03-18 02:22:45,505 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:22:45,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:22:45,505 INFO L85 PathProgramCache]: Analyzing trace with hash 508793618, now seen corresponding path program 31 times [2022-03-18 02:22:45,506 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:22:45,506 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1252152506] [2022-03-18 02:22:45,730 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:22:45,730 INFO L85 PathProgramCache]: Analyzing trace with hash 1736944174, now seen corresponding path program 1 times [2022-03-18 02:22:45,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:22:45,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1672313819] [2022-03-18 02:22:45,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:22:45,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:22:45,734 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:22:45,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [921165491] [2022-03-18 02:22:45,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:22:45,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:22:45,735 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:22:45,744 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:22:45,745 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-03-18 02:22:45,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:22:45,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:22:45,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:22:45,854 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:22:45,854 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:22:45,855 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:22:45,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1672313819] [2022-03-18 02:22:45,855 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:22:45,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [921165491] [2022-03-18 02:22:45,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [921165491] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:22:45,855 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:22:45,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:23:29,501 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:23:29,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1252152506] [2022-03-18 02:23:29,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1252152506] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:23:29,502 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:23:29,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-03-18 02:23:29,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945694862] [2022-03-18 02:23:29,502 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:23:29,502 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-03-18 02:23:29,502 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:23:29,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-03-18 02:23:29,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2022-03-18 02:23:29,503 INFO L87 Difference]: Start difference. First operand 123 states and 128 transitions. Second operand has 66 states, 66 states have (on average 1.6818181818181819) internal successors, (111), 66 states have internal predecessors, (111), 3 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 02:23:47,466 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:23:49,634 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:23:51,793 WARN L534 Checker$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 02:23:53,968 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:23:56,134 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:23:58,313 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:24:00,480 WARN L534 Checker$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 02:24:02,651 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:24:04,820 WARN L534 Checker$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 02:24:06,989 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:24:09,152 WARN L534 Checker$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 02:24:11,316 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.16s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:24:13,482 WARN L534 Checker$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 02:24:14,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:24:14,012 INFO L93 Difference]: Finished difference Result 151 states and 162 transitions. [2022-03-18 02:24:14,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-03-18 02:24:14,013 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.6818181818181819) internal successors, (111), 66 states have internal predecessors, (111), 3 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 117 [2022-03-18 02:24:14,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:24:14,014 INFO L225 Difference]: With dead ends: 151 [2022-03-18 02:24:14,014 INFO L226 Difference]: Without dead ends: 126 [2022-03-18 02:24:14,014 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 43.5s TimeCoverageRelationStatistics Valid=131, Invalid=4159, Unknown=0, NotChecked=0, Total=4290 [2022-03-18 02:24:14,015 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 873 mSDsCounter, 0 mSdLazyCounter, 6382 mSolverCounterSat, 0 mSolverCounterUnsat, 13 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 38.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 896 SdHoareTripleChecker+Invalid, 6395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6382 IncrementalHoareTripleChecker+Invalid, 13 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 44.3s IncrementalHoareTripleChecker+Time [2022-03-18 02:24:14,015 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 896 Invalid, 6395 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [0 Valid, 6382 Invalid, 13 Unknown, 0 Unchecked, 44.3s Time] [2022-03-18 02:24:14,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-03-18 02:24:14,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2022-03-18 02:24:14,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 117 states have (on average 1.0512820512820513) internal successors, (123), 118 states have internal predecessors, (123), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:24:14,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 131 transitions. [2022-03-18 02:24:14,035 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 131 transitions. Word has length 117 [2022-03-18 02:24:14,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:24:14,035 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 131 transitions. [2022-03-18 02:24:14,036 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.6818181818181819) internal successors, (111), 66 states have internal predecessors, (111), 3 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 02:24:14,036 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 131 transitions. [2022-03-18 02:24:14,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-03-18 02:24:14,036 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:24:14,036 INFO L500 BasicCegarLoop]: trace histogram [33, 33, 32, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:24:14,063 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-03-18 02:24:14,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-18 02:24:14,251 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:24:14,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:24:14,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1239065747, now seen corresponding path program 32 times [2022-03-18 02:24:14,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:24:14,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [438686224] [2022-03-18 02:24:14,643 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:24:14,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1946144274, now seen corresponding path program 1 times [2022-03-18 02:24:14,644 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:24:14,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887935892] [2022-03-18 02:24:14,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:24:14,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:24:14,654 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:24:14,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [478235368] [2022-03-18 02:24:14,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:24:14,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:24:14,655 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:24:14,656 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:24:14,658 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-03-18 02:24:14,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:24:14,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:24:14,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:24:14,779 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:24:14,779 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:24:14,780 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:24:14,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887935892] [2022-03-18 02:24:14,780 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:24:14,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478235368] [2022-03-18 02:24:14,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478235368] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:24:14,780 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:24:14,780 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 02:25:05,180 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 02:25:05,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [438686224] [2022-03-18 02:25:05,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [438686224] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:25:05,181 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:25:05,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-03-18 02:25:05,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288937574] [2022-03-18 02:25:05,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 02:25:05,182 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-03-18 02:25:05,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 02:25:05,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-03-18 02:25:05,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=4421, Unknown=0, NotChecked=0, Total=4556 [2022-03-18 02:25:05,183 INFO L87 Difference]: Start difference. First operand 126 states and 131 transitions. Second operand has 68 states, 68 states have (on average 1.6764705882352942) internal successors, (114), 68 states have internal predecessors, (114), 3 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 02:25:25,436 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:25:27,611 WARN L534 Checker$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 02:25:29,773 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:25:31,933 WARN L534 Checker$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 02:25:34,104 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:25:36,246 WARN L534 Checker$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 02:25:38,418 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:25:40,596 WARN L534 Checker$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 02:25:42,781 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-18 02:25:44,952 WARN L534 Checker$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 02:25:47,113 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 02:25:47,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 02:25:47,687 INFO L93 Difference]: Finished difference Result 154 states and 165 transitions. [2022-03-18 02:25:47,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-03-18 02:25:47,688 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 1.6764705882352942) internal successors, (114), 68 states have internal predecessors, (114), 3 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 120 [2022-03-18 02:25:47,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 02:25:47,689 INFO L225 Difference]: With dead ends: 154 [2022-03-18 02:25:47,690 INFO L226 Difference]: Without dead ends: 129 [2022-03-18 02:25:47,690 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 50.2s TimeCoverageRelationStatistics Valid=135, Invalid=4421, Unknown=0, NotChecked=0, Total=4556 [2022-03-18 02:25:47,691 INFO L912 BasicCegarLoop]: 23 mSDtfsCounter, 1 mSDsluCounter, 914 mSDsCounter, 0 mSdLazyCounter, 6881 mSolverCounterSat, 0 mSolverCounterUnsat, 11 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 35.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 937 SdHoareTripleChecker+Invalid, 6892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6881 IncrementalHoareTripleChecker+Invalid, 11 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 42.3s IncrementalHoareTripleChecker+Time [2022-03-18 02:25:47,691 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 937 Invalid, 6892 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [0 Valid, 6881 Invalid, 11 Unknown, 0 Unchecked, 42.3s Time] [2022-03-18 02:25:47,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-03-18 02:25:47,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2022-03-18 02:25:47,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 120 states have (on average 1.05) internal successors, (126), 121 states have internal predecessors, (126), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-18 02:25:47,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 134 transitions. [2022-03-18 02:25:47,716 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 134 transitions. Word has length 120 [2022-03-18 02:25:47,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 02:25:47,716 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 134 transitions. [2022-03-18 02:25:47,716 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 1.6764705882352942) internal successors, (114), 68 states have internal predecessors, (114), 3 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 02:25:47,716 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 134 transitions. [2022-03-18 02:25:47,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2022-03-18 02:25:47,717 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 02:25:47,717 INFO L500 BasicCegarLoop]: trace histogram [34, 34, 33, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 02:25:47,743 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-03-18 02:25:47,934 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:25:47,934 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 02:25:47,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 02:25:47,934 INFO L85 PathProgramCache]: Analyzing trace with hash -1528260750, now seen corresponding path program 33 times [2022-03-18 02:25:47,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 02:25:47,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1454576890] [2022-03-18 02:25:48,227 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 02:25:48,227 INFO L85 PathProgramCache]: Analyzing trace with hash -1334265426, now seen corresponding path program 1 times [2022-03-18 02:25:48,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 02:25:48,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182685095] [2022-03-18 02:25:48,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:25:48,228 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 02:25:48,236 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 02:25:48,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1403140626] [2022-03-18 02:25:48,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 02:25:48,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 02:25:48,237 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 02:25:48,240 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 02:25:48,241 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-03-18 02:25:48,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 02:25:48,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-18 02:25:48,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 02:25:48,357 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 02:25:48,357 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 02:25:48,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 02:25:48,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182685095] [2022-03-18 02:25:48,357 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 02:25:48,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403140626] [2022-03-18 02:25:48,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403140626] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 02:25:48,357 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 02:25:48,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3