/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 17:20:28,245 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 17:20:28,247 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 17:20:28,271 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 17:20:28,279 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 17:20:28,280 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 17:20:28,281 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 17:20:28,282 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 17:20:28,283 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 17:20:28,284 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 17:20:28,285 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 17:20:28,286 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 17:20:28,288 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 17:20:28,289 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 17:20:28,289 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 17:20:28,290 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 17:20:28,291 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 17:20:28,293 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 17:20:28,299 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 17:20:28,300 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 17:20:28,301 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 17:20:28,302 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 17:20:28,309 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 17:20:28,309 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 17:20:28,311 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 17:20:28,311 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 17:20:28,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 17:20:28,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 17:20:28,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 17:20:28,312 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 17:20:28,313 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 17:20:28,313 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 17:20:28,313 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 17:20:28,313 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 17:20:28,313 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 17:20:28,313 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:20:28,313 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 17:20:28,314 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 17:20:28,314 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 17:20:28,314 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 17:20:28,314 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 17:20:28,314 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 17:20:28,314 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 17:20:28,490 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 17:20:28,523 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 17:20:28,527 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 17:20:28,528 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 17:20:28,529 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 17:20:28,530 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound20.c [2022-04-06 17:20:28,583 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9bf72ae6/7f79d346b1fd47068971948903d34d5a/FLAG317156a33 [2022-04-06 17:20:28,952 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 17:20:28,952 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound20.c [2022-04-06 17:20:28,957 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9bf72ae6/7f79d346b1fd47068971948903d34d5a/FLAG317156a33 [2022-04-06 17:20:28,968 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e9bf72ae6/7f79d346b1fd47068971948903d34d5a [2022-04-06 17:20:28,971 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 17:20:28,972 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 17:20:28,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 17:20:28,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 17:20:28,976 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 17:20:28,977 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:20:28" (1/1) ... [2022-04-06 17:20:28,977 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ce219ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:28, skipping insertion in model container [2022-04-06 17:20:28,978 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:20:28" (1/1) ... [2022-04-06 17:20:28,983 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 17:20:28,995 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 17:20:29,147 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/hard2_unwindbound20.c[526,539] [2022-04-06 17:20:29,166 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:20:29,172 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 17:20:29,182 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/hard2_unwindbound20.c[526,539] [2022-04-06 17:20:29,185 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:20:29,196 INFO L208 MainTranslator]: Completed translation [2022-04-06 17:20:29,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29 WrapperNode [2022-04-06 17:20:29,197 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 17:20:29,198 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 17:20:29,198 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 17:20:29,198 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 17:20:29,207 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,207 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,215 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,216 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,230 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,235 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,236 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,237 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 17:20:29,238 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 17:20:29,238 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 17:20:29,238 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 17:20:29,239 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (1/1) ... [2022-04-06 17:20:29,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:20:29,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:29,275 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) [2022-04-06 17:20:29,279 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 [2022-04-06 17:20:29,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 17:20:29,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 17:20:29,304 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 17:20:29,304 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 17:20:29,304 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 17:20:29,305 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 17:20:29,305 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 17:20:29,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 17:20:29,357 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 17:20:29,358 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 17:20:29,509 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 17:20:29,515 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 17:20:29,515 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 17:20:29,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:20:29 BoogieIcfgContainer [2022-04-06 17:20:29,519 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 17:20:29,520 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 17:20:29,520 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 17:20:29,523 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 17:20:29,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 05:20:28" (1/3) ... [2022-04-06 17:20:29,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4879f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:20:29, skipping insertion in model container [2022-04-06 17:20:29,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:20:29" (2/3) ... [2022-04-06 17:20:29,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4879f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:20:29, skipping insertion in model container [2022-04-06 17:20:29,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:20:29" (3/3) ... [2022-04-06 17:20:29,527 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound20.c [2022-04-06 17:20:29,531 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 17:20:29,531 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 17:20:29,565 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 17:20:29,571 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 [2022-04-06 17:20:29,571 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 17:20:29,584 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-04-06 17:20:29,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 17:20:29,591 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:29,592 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:29,592 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:29,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:29,597 INFO L85 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 1 times [2022-04-06 17:20:29,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:29,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1472495426] [2022-04-06 17:20:29,615 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:29,616 INFO L85 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 2 times [2022-04-06 17:20:29,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:29,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336754451] [2022-04-06 17:20:29,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:29,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:29,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:29,752 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:20:29,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:29,770 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 17:20:29,771 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:29,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336754451] [2022-04-06 17:20:29,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336754451] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:29,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:29,772 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:20:29,775 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:29,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1472495426] [2022-04-06 17:20:29,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1472495426] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:29,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:29,776 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:20:29,776 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656263348] [2022-04-06 17:20:29,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:29,781 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 17:20:29,781 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:29,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 17:20:29,815 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 17:20:29,818 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) 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) [2022-04-06 17:20:29,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:29,930 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2022-04-06 17:20:29,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 17:20:29,933 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 [2022-04-06 17:20:29,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:29,939 INFO L225 Difference]: With dead ends: 57 [2022-04-06 17:20:29,940 INFO L226 Difference]: Without dead ends: 27 [2022-04-06 17:20:29,943 INFO L912 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 [2022-04-06 17:20:29,946 INFO L913 BasicCegarLoop]: 40 mSDtfsCounter, 6 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:29,947 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 44 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:29,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-04-06 17:20:29,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-04-06 17:20:29,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 17:20:29,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2022-04-06 17:20:29,982 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2022-04-06 17:20:29,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:29,983 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2022-04-06 17:20:29,983 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) [2022-04-06 17:20:29,983 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2022-04-06 17:20:29,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 17:20:29,984 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:29,984 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:29,984 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 17:20:29,985 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:29,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:29,986 INFO L85 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 1 times [2022-04-06 17:20:29,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:29,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [693620733] [2022-04-06 17:20:29,987 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:29,987 INFO L85 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 2 times [2022-04-06 17:20:29,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:29,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879302467] [2022-04-06 17:20:29,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:29,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:30,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:20:30,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 17:20:30,086 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:30,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879302467] [2022-04-06 17:20:30,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879302467] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,087 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,087 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:30,087 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:30,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [693620733] [2022-04-06 17:20:30,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [693620733] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,088 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:30,088 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677842962] [2022-04-06 17:20:30,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:30,089 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:20:30,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:20:30,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:20:30,091 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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) [2022-04-06 17:20:30,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:30,225 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2022-04-06 17:20:30,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:20:30,226 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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 [2022-04-06 17:20:30,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:30,227 INFO L225 Difference]: With dead ends: 41 [2022-04-06 17:20:30,227 INFO L226 Difference]: Without dead ends: 39 [2022-04-06 17:20:30,228 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:30,229 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 24 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:30,229 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 85 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:30,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-04-06 17:20:30,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2022-04-06 17:20:30,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 17:20:30,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2022-04-06 17:20:30,241 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2022-04-06 17:20:30,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:30,241 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2022-04-06 17:20:30,242 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 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) [2022-04-06 17:20:30,242 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2022-04-06 17:20:30,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-06 17:20:30,242 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:30,242 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:30,243 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 17:20:30,243 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:30,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:30,244 INFO L85 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 1 times [2022-04-06 17:20:30,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1963887885] [2022-04-06 17:20:30,245 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:30,245 INFO L85 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 2 times [2022-04-06 17:20:30,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:30,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346470135] [2022-04-06 17:20:30,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:30,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:30,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:20:30,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 17:20:30,346 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:30,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346470135] [2022-04-06 17:20:30,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346470135] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,346 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 17:20:30,347 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:30,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1963887885] [2022-04-06 17:20:30,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1963887885] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,347 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 17:20:30,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164620816] [2022-04-06 17:20:30,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:30,349 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:30,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,350 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:30,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:20:30,351 INFO L87 Difference]: Start difference. First operand 30 states and 39 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) [2022-04-06 17:20:30,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:30,442 INFO L93 Difference]: Finished difference Result 46 states and 61 transitions. [2022-04-06 17:20:30,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:20:30,442 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 [2022-04-06 17:20:30,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:30,444 INFO L225 Difference]: With dead ends: 46 [2022-04-06 17:20:30,444 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 17:20:30,445 INFO L912 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 [2022-04-06 17:20:30,448 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 6 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:30,453 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 73 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:30,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 17:20:30,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 17:20:30,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 17:20:30,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2022-04-06 17:20:30,474 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2022-04-06 17:20:30,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:30,475 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2022-04-06 17:20:30,476 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) [2022-04-06 17:20:30,477 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2022-04-06 17:20:30,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 17:20:30,477 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:30,477 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:30,478 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 17:20:30,480 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:30,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:30,480 INFO L85 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 1 times [2022-04-06 17:20:30,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1347298695] [2022-04-06 17:20:30,482 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:30,482 INFO L85 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 2 times [2022-04-06 17:20:30,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:30,482 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905547059] [2022-04-06 17:20:30,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:30,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:30,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:20:30,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,586 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 17:20:30,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:20:30,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 17:20:30,596 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:30,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905547059] [2022-04-06 17:20:30,597 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [905547059] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,597 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,597 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:30,597 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:30,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1347298695] [2022-04-06 17:20:30,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1347298695] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:30,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:30,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:30,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378805801] [2022-04-06 17:20:30,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:30,600 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:20:30,600 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:20:30,601 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:20:30,601 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 17:20:30,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:30,788 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-04-06 17:20:30,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:20:30,789 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 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 17 [2022-04-06 17:20:30,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:30,791 INFO L225 Difference]: With dead ends: 46 [2022-04-06 17:20:30,791 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 17:20:30,793 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:30,797 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 19 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:30,801 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 78 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:30,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 17:20:30,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2022-04-06 17:20:30,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 17:20:30,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2022-04-06 17:20:30,815 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2022-04-06 17:20:30,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:30,815 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2022-04-06 17:20:30,815 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 17:20:30,815 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2022-04-06 17:20:30,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-06 17:20:30,816 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:30,816 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:30,816 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-04-06 17:20:30,816 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:30,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:30,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 1 times [2022-04-06 17:20:30,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:30,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [235433388] [2022-04-06 17:20:30,818 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:30,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 2 times [2022-04-06 17:20:30,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:30,818 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756871715] [2022-04-06 17:20:30,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:30,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:30,833 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:30,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2018625693] [2022-04-06 17:20:30,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:30,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:30,834 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:30,843 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) [2022-04-06 17:20:30,847 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 17:20:30,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:30,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:30,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 17:20:30,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:31,036 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 17:20:31,036 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:20:31,037 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:31,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756871715] [2022-04-06 17:20:31,037 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:31,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2018625693] [2022-04-06 17:20:31,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2018625693] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,037 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,038 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:31,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [235433388] [2022-04-06 17:20:31,038 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [235433388] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,038 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,038 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304709338] [2022-04-06 17:20:31,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:31,039 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:31,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:31,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:31,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:20:31,040 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 17:20:31,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:31,112 INFO L93 Difference]: Finished difference Result 65 states and 87 transitions. [2022-04-06 17:20:31,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:20:31,112 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2022-04-06 17:20:31,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:31,113 INFO L225 Difference]: With dead ends: 65 [2022-04-06 17:20:31,114 INFO L226 Difference]: Without dead ends: 50 [2022-04-06 17:20:31,114 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:20:31,115 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 10 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:31,115 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 121 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:31,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-04-06 17:20:31,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-04-06 17:20:31,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 17:20:31,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2022-04-06 17:20:31,124 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 22 [2022-04-06 17:20:31,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:31,124 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2022-04-06 17:20:31,124 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-04-06 17:20:31,124 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2022-04-06 17:20:31,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-04-06 17:20:31,125 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:31,125 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:31,153 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:31,350 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:31,351 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:31,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:31,351 INFO L85 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 1 times [2022-04-06 17:20:31,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:31,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1781166555] [2022-04-06 17:20:31,352 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:31,352 INFO L85 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 2 times [2022-04-06 17:20:31,352 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:31,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198306012] [2022-04-06 17:20:31,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:31,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:31,362 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:31,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [541676093] [2022-04-06 17:20:31,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:31,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:31,363 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:31,369 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) [2022-04-06 17:20:31,371 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 17:20:31,412 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:31,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:31,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:20:31,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:31,510 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:20:31,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:20:31,511 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:31,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198306012] [2022-04-06 17:20:31,511 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:31,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541676093] [2022-04-06 17:20:31,511 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541676093] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,511 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,511 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,512 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:31,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1781166555] [2022-04-06 17:20:31,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1781166555] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,512 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,512 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864745089] [2022-04-06 17:20:31,512 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:31,512 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:31,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:31,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:31,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:20:31,513 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:31,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:31,555 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-04-06 17:20:31,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:20:31,556 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-04-06 17:20:31,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:31,557 INFO L225 Difference]: With dead ends: 70 [2022-04-06 17:20:31,557 INFO L226 Difference]: Without dead ends: 63 [2022-04-06 17:20:31,558 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:20:31,559 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 3 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:31,559 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 124 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:31,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-06 17:20:31,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-04-06 17:20:31,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 17:20:31,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2022-04-06 17:20:31,578 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2022-04-06 17:20:31,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:31,578 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2022-04-06 17:20:31,581 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:31,582 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2022-04-06 17:20:31,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-04-06 17:20:31,587 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:31,587 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:31,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:31,795 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,SelfDestructingSolverStorable5 [2022-04-06 17:20:31,796 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:31,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:31,796 INFO L85 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 1 times [2022-04-06 17:20:31,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:31,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [956901886] [2022-04-06 17:20:31,797 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:20:31,797 INFO L85 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 2 times [2022-04-06 17:20:31,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:31,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469287412] [2022-04-06 17:20:31,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:31,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:31,806 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:31,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1772626048] [2022-04-06 17:20:31,807 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:31,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:31,807 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:31,808 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) [2022-04-06 17:20:31,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 17:20:31,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:31,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:31,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:20:31,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:31,968 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:20:31,968 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:20:31,968 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:31,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469287412] [2022-04-06 17:20:31,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:31,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772626048] [2022-04-06 17:20:31,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772626048] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,969 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,969 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:31,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [956901886] [2022-04-06 17:20:31,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [956901886] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:31,970 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:31,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:31,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476104051] [2022-04-06 17:20:31,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:31,970 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:31,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:31,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:31,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:20:31,971 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:32,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:32,017 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2022-04-06 17:20:32,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:20:32,017 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2022-04-06 17:20:32,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:32,018 INFO L225 Difference]: With dead ends: 76 [2022-04-06 17:20:32,018 INFO L226 Difference]: Without dead ends: 64 [2022-04-06 17:20:32,019 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:20:32,019 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 11 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 95 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 [2022-04-06 17:20:32,020 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 95 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:32,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-04-06 17:20:32,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2022-04-06 17:20:32,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 17:20:32,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2022-04-06 17:20:32,029 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2022-04-06 17:20:32,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:32,029 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2022-04-06 17:20:32,029 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:32,030 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2022-04-06 17:20:32,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-04-06 17:20:32,030 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:32,031 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:32,054 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:32,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:32,252 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:32,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:32,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 1 times [2022-04-06 17:20:32,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:32,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [690366779] [2022-04-06 17:20:32,275 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:32,275 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:32,275 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:32,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 2 times [2022-04-06 17:20:32,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:32,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70039436] [2022-04-06 17:20:32,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:32,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:32,286 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:32,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [968136723] [2022-04-06 17:20:32,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:32,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:32,287 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:32,287 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) [2022-04-06 17:20:32,309 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 17:20:32,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:32,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:32,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:20:32,345 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:32,421 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-04-06 17:20:32,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:32,505 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 17:20:32,506 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:32,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70039436] [2022-04-06 17:20:32,506 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:32,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968136723] [2022-04-06 17:20:32,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968136723] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:32,506 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:32,506 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-04-06 17:20:32,507 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:32,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [690366779] [2022-04-06 17:20:32,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [690366779] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:32,507 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:32,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:32,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017033717] [2022-04-06 17:20:32,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:32,507 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:32,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:32,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:32,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-04-06 17:20:32,508 INFO L87 Difference]: Start difference. First operand 63 states and 76 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 17:20:32,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:32,536 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2022-04-06 17:20:32,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:20:32,537 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2022-04-06 17:20:32,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:32,540 INFO L225 Difference]: With dead ends: 90 [2022-04-06 17:20:32,540 INFO L226 Difference]: Without dead ends: 65 [2022-04-06 17:20:32,545 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-04-06 17:20:32,546 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 2 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:32,547 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 126 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:32,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-04-06 17:20:32,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-04-06 17:20:32,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-04-06 17:20:32,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2022-04-06 17:20:32,565 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2022-04-06 17:20:32,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:32,566 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2022-04-06 17:20:32,567 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-04-06 17:20:32,567 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2022-04-06 17:20:32,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-04-06 17:20:32,568 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:32,569 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:32,596 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:32,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:32,787 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:32,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:32,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 1 times [2022-04-06 17:20:32,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:32,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [838233395] [2022-04-06 17:20:32,795 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:32,795 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:32,795 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:32,795 INFO L85 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 2 times [2022-04-06 17:20:32,795 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:32,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530705063] [2022-04-06 17:20:32,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:32,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:32,816 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:32,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1544567736] [2022-04-06 17:20:32,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:32,817 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:32,817 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:32,818 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) [2022-04-06 17:20:32,819 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 17:20:32,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:32,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:32,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 17:20:32,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:33,021 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-06 17:20:33,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:33,112 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2022-04-06 17:20:33,112 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:33,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530705063] [2022-04-06 17:20:33,113 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:33,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1544567736] [2022-04-06 17:20:33,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1544567736] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 17:20:33,113 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:20:33,113 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-04-06 17:20:33,113 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:33,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [838233395] [2022-04-06 17:20:33,113 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [838233395] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:33,114 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:33,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:20:33,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672348718] [2022-04-06 17:20:33,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:33,114 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:20:33,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:33,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:20:33,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-04-06 17:20:33,115 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:33,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:33,157 INFO L93 Difference]: Finished difference Result 78 states and 95 transitions. [2022-04-06 17:20:33,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:20:33,158 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 40 [2022-04-06 17:20:33,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:33,159 INFO L225 Difference]: With dead ends: 78 [2022-04-06 17:20:33,159 INFO L226 Difference]: Without dead ends: 76 [2022-04-06 17:20:33,159 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 17:20:33,160 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 11 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:33,160 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 103 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:33,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-04-06 17:20:33,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 73. [2022-04-06 17:20:33,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 49 states have internal predecessors, (56), 17 states have call successors, (17), 10 states have call predecessors, (17), 9 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2022-04-06 17:20:33,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 88 transitions. [2022-04-06 17:20:33,169 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 88 transitions. Word has length 40 [2022-04-06 17:20:33,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:33,169 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 88 transitions. [2022-04-06 17:20:33,169 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:20:33,170 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 88 transitions. [2022-04-06 17:20:33,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-04-06 17:20:33,171 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:33,171 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:33,202 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:33,387 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:33,388 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:33,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:33,388 INFO L85 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 1 times [2022-04-06 17:20:33,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:33,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [614067661] [2022-04-06 17:20:33,394 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:33,394 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:33,394 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:33,394 INFO L85 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 2 times [2022-04-06 17:20:33,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:33,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995280591] [2022-04-06 17:20:33,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:33,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:33,402 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:33,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1158077101] [2022-04-06 17:20:33,403 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:33,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:33,403 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:33,404 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) [2022-04-06 17:20:33,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 17:20:33,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:33,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:33,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 17:20:33,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:33,567 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-04-06 17:20:33,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:33,679 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 14 proven. 6 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 17:20:33,679 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:33,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995280591] [2022-04-06 17:20:33,679 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:33,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1158077101] [2022-04-06 17:20:33,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1158077101] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:33,680 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:33,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 17:20:33,680 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:33,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [614067661] [2022-04-06 17:20:33,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [614067661] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:33,680 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:33,680 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:33,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656986445] [2022-04-06 17:20:33,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:33,681 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:20:33,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:33,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:20:33,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:33,682 INFO L87 Difference]: Start difference. First operand 73 states and 88 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 17:20:33,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:33,717 INFO L93 Difference]: Finished difference Result 104 states and 120 transitions. [2022-04-06 17:20:33,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:20:33,718 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2022-04-06 17:20:33,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:33,719 INFO L225 Difference]: With dead ends: 104 [2022-04-06 17:20:33,719 INFO L226 Difference]: Without dead ends: 92 [2022-04-06 17:20:33,719 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:33,720 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 6 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:33,720 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 117 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:33,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-04-06 17:20:33,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2022-04-06 17:20:33,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 61 states have internal predecessors, (69), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 17:20:33,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 107 transitions. [2022-04-06 17:20:33,731 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 107 transitions. Word has length 53 [2022-04-06 17:20:33,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:33,731 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 107 transitions. [2022-04-06 17:20:33,731 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 17:20:33,732 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 107 transitions. [2022-04-06 17:20:33,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 17:20:33,735 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:33,735 INFO L499 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:33,759 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:33,951 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:33,952 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:33,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:33,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 3 times [2022-04-06 17:20:33,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:33,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [839838842] [2022-04-06 17:20:33,963 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:33,963 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:33,963 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:33,963 INFO L85 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 4 times [2022-04-06 17:20:33,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:33,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617883479] [2022-04-06 17:20:33,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:33,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:33,978 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:33,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [818847045] [2022-04-06 17:20:33,979 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:20:33,979 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:33,979 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:33,980 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) [2022-04-06 17:20:33,981 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 17:20:34,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:20:34,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:34,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 17:20:34,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:34,136 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-04-06 17:20:34,136 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:34,250 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2022-04-06 17:20:34,250 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:34,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617883479] [2022-04-06 17:20:34,250 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:34,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818847045] [2022-04-06 17:20:34,250 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818847045] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:34,250 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:34,250 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2022-04-06 17:20:34,251 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:34,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [839838842] [2022-04-06 17:20:34,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [839838842] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:34,251 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:34,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:20:34,251 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766016999] [2022-04-06 17:20:34,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:34,252 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:20:34,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:34,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:20:34,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:34,252 INFO L87 Difference]: Start difference. First operand 91 states and 107 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 17:20:34,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:34,295 INFO L93 Difference]: Finished difference Result 126 states and 155 transitions. [2022-04-06 17:20:34,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:20:34,296 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2022-04-06 17:20:34,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:34,297 INFO L225 Difference]: With dead ends: 126 [2022-04-06 17:20:34,297 INFO L226 Difference]: Without dead ends: 93 [2022-04-06 17:20:34,297 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:20:34,298 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 3 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:34,298 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 134 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:34,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-04-06 17:20:34,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-04-06 17:20:34,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 63 states have internal predecessors, (71), 20 states have call successors, (20), 13 states have call predecessors, (20), 12 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 17:20:34,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 109 transitions. [2022-04-06 17:20:34,308 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 109 transitions. Word has length 55 [2022-04-06 17:20:34,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:34,308 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 109 transitions. [2022-04-06 17:20:34,308 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2022-04-06 17:20:34,308 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 109 transitions. [2022-04-06 17:20:34,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-04-06 17:20:34,309 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:34,309 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:34,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:34,532 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:34,533 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:34,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:34,533 INFO L85 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 1 times [2022-04-06 17:20:34,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:34,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [693821071] [2022-04-06 17:20:34,537 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:34,537 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:34,538 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:34,538 INFO L85 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 2 times [2022-04-06 17:20:34,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:34,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608406612] [2022-04-06 17:20:34,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:34,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:34,546 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:34,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [819323617] [2022-04-06 17:20:34,546 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:34,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:34,547 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:34,547 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) [2022-04-06 17:20:34,563 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 17:20:34,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:34,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:34,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 17:20:34,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:34,739 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-04-06 17:20:34,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 17:20:34,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:34,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608406612] [2022-04-06 17:20:34,893 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:34,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819323617] [2022-04-06 17:20:34,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819323617] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:34,893 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:34,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-04-06 17:20:34,893 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:34,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [693821071] [2022-04-06 17:20:34,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [693821071] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:34,894 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:34,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 17:20:34,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780259173] [2022-04-06 17:20:34,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:34,894 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 17:20:34,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:34,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 17:20:34,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:20:34,895 INFO L87 Difference]: Start difference. First operand 93 states and 109 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 17:20:34,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:34,967 INFO L93 Difference]: Finished difference Result 145 states and 168 transitions. [2022-04-06 17:20:34,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:20:34,967 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 62 [2022-04-06 17:20:34,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:34,968 INFO L225 Difference]: With dead ends: 145 [2022-04-06 17:20:34,969 INFO L226 Difference]: Without dead ends: 130 [2022-04-06 17:20:34,970 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2022-04-06 17:20:34,971 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 27 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 150 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:34,971 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 150 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:34,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-04-06 17:20:34,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 127. [2022-04-06 17:20:34,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 83 states have (on average 1.1686746987951808) internal successors, (97), 86 states have internal predecessors, (97), 27 states have call successors, (27), 18 states have call predecessors, (27), 16 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2022-04-06 17:20:34,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 148 transitions. [2022-04-06 17:20:34,987 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 148 transitions. Word has length 62 [2022-04-06 17:20:34,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:34,987 INFO L478 AbstractCegarLoop]: Abstraction has 127 states and 148 transitions. [2022-04-06 17:20:34,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 17:20:34,987 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 148 transitions. [2022-04-06 17:20:34,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-04-06 17:20:34,988 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:34,989 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:35,016 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:35,203 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,SelfDestructingSolverStorable11 [2022-04-06 17:20:35,204 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:35,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:35,204 INFO L85 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 1 times [2022-04-06 17:20:35,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:35,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1720198864] [2022-04-06 17:20:35,208 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:35,208 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:35,209 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:35,209 INFO L85 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 2 times [2022-04-06 17:20:35,209 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:35,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006740484] [2022-04-06 17:20:35,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:35,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:35,216 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:35,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1277748765] [2022-04-06 17:20:35,216 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:35,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:35,217 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:35,218 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) [2022-04-06 17:20:35,219 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 17:20:35,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:35,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:35,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 17:20:35,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:35,601 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 17:20:35,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:36,619 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 17:20:36,619 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:36,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006740484] [2022-04-06 17:20:36,620 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:36,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277748765] [2022-04-06 17:20:36,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277748765] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:36,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:36,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2022-04-06 17:20:36,620 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:36,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1720198864] [2022-04-06 17:20:36,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1720198864] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:36,620 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:36,620 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 17:20:36,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54772527] [2022-04-06 17:20:36,621 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:36,621 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 17:20:36,621 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:36,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 17:20:36,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:20:36,622 INFO L87 Difference]: Start difference. First operand 127 states and 148 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-04-06 17:20:36,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:36,786 INFO L93 Difference]: Finished difference Result 181 states and 219 transitions. [2022-04-06 17:20:36,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:20:36,786 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2022-04-06 17:20:36,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:36,788 INFO L225 Difference]: With dead ends: 181 [2022-04-06 17:20:36,788 INFO L226 Difference]: Without dead ends: 137 [2022-04-06 17:20:36,788 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:20:36,789 INFO L913 BasicCegarLoop]: 50 mSDtfsCounter, 13 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:36,789 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 187 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:36,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-04-06 17:20:36,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 135. [2022-04-06 17:20:36,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 89 states have (on average 1.1685393258426966) internal successors, (104), 92 states have internal predecessors, (104), 27 states have call successors, (27), 19 states have call predecessors, (27), 18 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 17:20:36,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 156 transitions. [2022-04-06 17:20:36,802 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 156 transitions. Word has length 62 [2022-04-06 17:20:36,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:36,802 INFO L478 AbstractCegarLoop]: Abstraction has 135 states and 156 transitions. [2022-04-06 17:20:36,802 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2022-04-06 17:20:36,803 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 156 transitions. [2022-04-06 17:20:36,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-04-06 17:20:36,803 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:36,803 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:36,831 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:37,019 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 17:20:37,020 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:37,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:37,020 INFO L85 PathProgramCache]: Analyzing trace with hash -378736343, now seen corresponding path program 3 times [2022-04-06 17:20:37,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:37,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1708670043] [2022-04-06 17:20:37,025 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:37,026 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:37,026 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:37,026 INFO L85 PathProgramCache]: Analyzing trace with hash -378736343, now seen corresponding path program 4 times [2022-04-06 17:20:37,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:37,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144564201] [2022-04-06 17:20:37,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:37,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:37,033 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:37,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2013739447] [2022-04-06 17:20:37,034 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:20:37,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:37,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:37,035 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) [2022-04-06 17:20:37,061 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 17:20:37,093 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:20:37,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:37,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 28 conjunts are in the unsatisfiable core [2022-04-06 17:20:37,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:37,564 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 48 proven. 34 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2022-04-06 17:20:37,564 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:37,617 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:20:37,686 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:37,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144564201] [2022-04-06 17:20:37,687 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:37,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013739447] [2022-04-06 17:20:37,687 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013739447] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 17:20:37,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:20:37,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-04-06 17:20:37,688 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:37,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1708670043] [2022-04-06 17:20:37,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1708670043] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:37,688 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:37,688 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 17:20:37,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502556065] [2022-04-06 17:20:37,688 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:37,689 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 17:20:37,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:37,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 17:20:37,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2022-04-06 17:20:37,690 INFO L87 Difference]: Start difference. First operand 135 states and 156 transitions. Second operand has 13 states, 12 states have (on average 2.0) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-04-06 17:20:37,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:37,988 INFO L93 Difference]: Finished difference Result 188 states and 232 transitions. [2022-04-06 17:20:37,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 17:20:37,989 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) Word has length 67 [2022-04-06 17:20:37,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:37,990 INFO L225 Difference]: With dead ends: 188 [2022-04-06 17:20:37,990 INFO L226 Difference]: Without dead ends: 163 [2022-04-06 17:20:37,991 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:20:37,991 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 40 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 63 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:37,991 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 246 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 333 Invalid, 0 Unknown, 63 Unchecked, 0.2s Time] [2022-04-06 17:20:37,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-04-06 17:20:38,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2022-04-06 17:20:38,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 102 states have (on average 1.1862745098039216) internal successors, (121), 107 states have internal predecessors, (121), 34 states have call successors, (34), 21 states have call predecessors, (34), 20 states have return successors, (32), 28 states have call predecessors, (32), 32 states have call successors, (32) [2022-04-06 17:20:38,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 187 transitions. [2022-04-06 17:20:38,009 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 187 transitions. Word has length 67 [2022-04-06 17:20:38,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:38,009 INFO L478 AbstractCegarLoop]: Abstraction has 157 states and 187 transitions. [2022-04-06 17:20:38,009 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.0) internal successors, (24), 9 states have internal predecessors, (24), 7 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 6 states have call successors, (10) [2022-04-06 17:20:38,010 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 187 transitions. [2022-04-06 17:20:38,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-04-06 17:20:38,010 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:38,010 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:38,038 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:38,224 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,SelfDestructingSolverStorable13 [2022-04-06 17:20:38,224 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:38,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:38,225 INFO L85 PathProgramCache]: Analyzing trace with hash 73149133, now seen corresponding path program 1 times [2022-04-06 17:20:38,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:38,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1874255430] [2022-04-06 17:20:38,229 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:38,229 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:38,229 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:38,229 INFO L85 PathProgramCache]: Analyzing trace with hash 73149133, now seen corresponding path program 2 times [2022-04-06 17:20:38,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:38,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8745129] [2022-04-06 17:20:38,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:38,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:38,237 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:38,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [908332575] [2022-04-06 17:20:38,238 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:20:38,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:38,238 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:38,239 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) [2022-04-06 17:20:38,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 17:20:38,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:20:38,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:38,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 41 conjunts are in the unsatisfiable core [2022-04-06 17:20:38,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:38,808 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 62 proven. 32 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2022-04-06 17:20:38,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:39,050 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 68 proven. 2 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2022-04-06 17:20:39,052 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:39,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8745129] [2022-04-06 17:20:39,052 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:39,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908332575] [2022-04-06 17:20:39,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908332575] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:39,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:39,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 16 [2022-04-06 17:20:39,053 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:39,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1874255430] [2022-04-06 17:20:39,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1874255430] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:39,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:39,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 17:20:39,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637214030] [2022-04-06 17:20:39,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:39,053 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 17:20:39,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:39,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 17:20:39,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:20:39,054 INFO L87 Difference]: Start difference. First operand 157 states and 187 transitions. Second operand has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-04-06 17:20:39,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:39,292 INFO L93 Difference]: Finished difference Result 186 states and 221 transitions. [2022-04-06 17:20:39,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:20:39,293 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2022-04-06 17:20:39,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:39,294 INFO L225 Difference]: With dead ends: 186 [2022-04-06 17:20:39,294 INFO L226 Difference]: Without dead ends: 129 [2022-04-06 17:20:39,295 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:20:39,295 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 20 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 280 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:39,296 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 147 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 280 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:20:39,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-04-06 17:20:39,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2022-04-06 17:20:39,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.180722891566265) internal successors, (98), 87 states have internal predecessors, (98), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (26), 23 states have call predecessors, (26), 26 states have call successors, (26) [2022-04-06 17:20:39,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 152 transitions. [2022-04-06 17:20:39,323 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 152 transitions. Word has length 73 [2022-04-06 17:20:39,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:39,323 INFO L478 AbstractCegarLoop]: Abstraction has 129 states and 152 transitions. [2022-04-06 17:20:39,323 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-04-06 17:20:39,324 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 152 transitions. [2022-04-06 17:20:39,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-04-06 17:20:39,324 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:39,324 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:39,352 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:39,547 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,SelfDestructingSolverStorable14 [2022-04-06 17:20:39,547 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:39,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:39,548 INFO L85 PathProgramCache]: Analyzing trace with hash 469209008, now seen corresponding path program 5 times [2022-04-06 17:20:39,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:39,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1135719691] [2022-04-06 17:20:39,552 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:39,552 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:39,552 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:39,552 INFO L85 PathProgramCache]: Analyzing trace with hash 469209008, now seen corresponding path program 6 times [2022-04-06 17:20:39,552 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:39,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [339675198] [2022-04-06 17:20:39,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:39,553 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:39,559 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:39,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [694240789] [2022-04-06 17:20:39,559 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:20:39,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:39,560 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:39,561 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) [2022-04-06 17:20:39,562 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 17:20:39,613 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-04-06 17:20:39,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:39,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 17:20:39,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:39,772 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 54 proven. 132 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-04-06 17:20:39,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:39,951 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 20 proven. 24 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2022-04-06 17:20:39,952 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:39,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [339675198] [2022-04-06 17:20:39,952 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:39,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694240789] [2022-04-06 17:20:39,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694240789] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:39,952 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:39,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2022-04-06 17:20:39,953 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:39,953 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1135719691] [2022-04-06 17:20:39,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1135719691] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:39,953 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:39,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 17:20:39,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923068017] [2022-04-06 17:20:39,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:39,953 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 17:20:39,953 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:39,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 17:20:39,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:20:39,954 INFO L87 Difference]: Start difference. First operand 129 states and 152 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-04-06 17:20:40,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:40,025 INFO L93 Difference]: Finished difference Result 170 states and 207 transitions. [2022-04-06 17:20:40,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 17:20:40,025 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2022-04-06 17:20:40,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:40,027 INFO L225 Difference]: With dead ends: 170 [2022-04-06 17:20:40,027 INFO L226 Difference]: Without dead ends: 131 [2022-04-06 17:20:40,028 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=127, Unknown=0, NotChecked=0, Total=210 [2022-04-06 17:20:40,028 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 3 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:40,028 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 186 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:20:40,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-04-06 17:20:40,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2022-04-06 17:20:40,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 85 states have (on average 1.1764705882352942) internal successors, (100), 89 states have internal predecessors, (100), 28 states have call successors, (28), 18 states have call predecessors, (28), 17 states have return successors, (26), 23 states have call predecessors, (26), 26 states have call successors, (26) [2022-04-06 17:20:40,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 154 transitions. [2022-04-06 17:20:40,047 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 154 transitions. Word has length 73 [2022-04-06 17:20:40,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:40,047 INFO L478 AbstractCegarLoop]: Abstraction has 131 states and 154 transitions. [2022-04-06 17:20:40,047 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2022-04-06 17:20:40,047 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 154 transitions. [2022-04-06 17:20:40,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-04-06 17:20:40,051 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:40,051 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:40,077 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:40,276 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,SelfDestructingSolverStorable15 [2022-04-06 17:20:40,276 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:40,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:40,277 INFO L85 PathProgramCache]: Analyzing trace with hash 1997631578, now seen corresponding path program 3 times [2022-04-06 17:20:40,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:40,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [973416381] [2022-04-06 17:20:40,280 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:40,280 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:40,280 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:40,281 INFO L85 PathProgramCache]: Analyzing trace with hash 1997631578, now seen corresponding path program 4 times [2022-04-06 17:20:40,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:40,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598144841] [2022-04-06 17:20:40,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:40,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:40,287 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:40,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1462651943] [2022-04-06 17:20:40,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:20:40,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:40,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:40,289 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) [2022-04-06 17:20:40,290 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 17:20:40,354 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:20:40,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:40,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 17:20:40,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:40,535 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-04-06 17:20:40,536 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:20:40,732 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 20 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2022-04-06 17:20:40,733 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:20:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598144841] [2022-04-06 17:20:40,733 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:20:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462651943] [2022-04-06 17:20:40,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462651943] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:20:40,733 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:20:40,733 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-04-06 17:20:40,733 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:20:40,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [973416381] [2022-04-06 17:20:40,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [973416381] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:20:40,734 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:20:40,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 17:20:40,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684739189] [2022-04-06 17:20:40,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:20:40,734 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 17:20:40,734 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:40,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 17:20:40,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:20:40,735 INFO L87 Difference]: Start difference. First operand 131 states and 154 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-04-06 17:20:40,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:20:40,841 INFO L93 Difference]: Finished difference Result 181 states and 209 transitions. [2022-04-06 17:20:40,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:20:40,842 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 80 [2022-04-06 17:20:40,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:20:40,844 INFO L225 Difference]: With dead ends: 181 [2022-04-06 17:20:40,844 INFO L226 Difference]: Without dead ends: 166 [2022-04-06 17:20:40,844 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=129, Unknown=0, NotChecked=0, Total=210 [2022-04-06 17:20:40,845 INFO L913 BasicCegarLoop]: 50 mSDtfsCounter, 29 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:20:40,845 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 171 Invalid, 90 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:20:40,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-04-06 17:20:40,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 163. [2022-04-06 17:20:40,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 106 states have (on average 1.1603773584905661) internal successors, (123), 110 states have internal predecessors, (123), 35 states have call successors, (35), 23 states have call predecessors, (35), 21 states have return successors, (32), 29 states have call predecessors, (32), 32 states have call successors, (32) [2022-04-06 17:20:40,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 190 transitions. [2022-04-06 17:20:40,862 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 190 transitions. Word has length 80 [2022-04-06 17:20:40,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:20:40,862 INFO L478 AbstractCegarLoop]: Abstraction has 163 states and 190 transitions. [2022-04-06 17:20:40,862 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2022-04-06 17:20:40,862 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 190 transitions. [2022-04-06 17:20:40,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-04-06 17:20:40,864 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:20:40,864 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:20:40,895 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-06 17:20:41,089 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,SelfDestructingSolverStorable16 [2022-04-06 17:20:41,089 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:20:41,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:20:41,090 INFO L85 PathProgramCache]: Analyzing trace with hash 1999359456, now seen corresponding path program 5 times [2022-04-06 17:20:41,090 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:20:41,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [645042258] [2022-04-06 17:20:41,093 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:20:41,094 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:20:41,094 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:20:41,094 INFO L85 PathProgramCache]: Analyzing trace with hash 1999359456, now seen corresponding path program 6 times [2022-04-06 17:20:41,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:20:41,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911325682] [2022-04-06 17:20:41,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:20:41,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:20:41,100 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:20:41,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654445284] [2022-04-06 17:20:41,100 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:20:41,100 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:20:41,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:20:41,105 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) [2022-04-06 17:20:41,127 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 17:20:41,162 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 17:20:41,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:20:41,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-06 17:20:41,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:20:41,615 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 57 proven. 10 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-04-06 17:20:41,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:21:03,650 WARN L232 SmtUtils]: Spent 6.33s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:22:00,830 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 45 proven. 22 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2022-04-06 17:22:00,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:22:00,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911325682] [2022-04-06 17:22:00,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:22:00,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654445284] [2022-04-06 17:22:00,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654445284] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:22:00,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:22:00,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2022-04-06 17:22:00,831 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:22:00,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [645042258] [2022-04-06 17:22:00,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [645042258] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:22:00,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:22:00,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:22:00,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452814700] [2022-04-06 17:22:00,832 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:22:00,832 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:22:00,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:00,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:22:00,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=182, Unknown=1, NotChecked=0, Total=240 [2022-04-06 17:22:00,833 INFO L87 Difference]: Start difference. First operand 163 states and 190 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 17:22:01,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:22:01,026 INFO L93 Difference]: Finished difference Result 193 states and 224 transitions. [2022-04-06 17:22:01,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:22:01,027 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 80 [2022-04-06 17:22:01,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:22:01,028 INFO L225 Difference]: With dead ends: 193 [2022-04-06 17:22:01,028 INFO L226 Difference]: Without dead ends: 173 [2022-04-06 17:22:01,028 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=70, Invalid=235, Unknown=1, NotChecked=0, Total=306 [2022-04-06 17:22:01,029 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 48 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:22:01,029 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 126 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:22:01,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-04-06 17:22:01,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 169. [2022-04-06 17:22:01,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 111 states have (on average 1.1531531531531531) internal successors, (128), 115 states have internal predecessors, (128), 35 states have call successors, (35), 23 states have call predecessors, (35), 22 states have return successors, (33), 30 states have call predecessors, (33), 33 states have call successors, (33) [2022-04-06 17:22:01,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 196 transitions. [2022-04-06 17:22:01,044 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 196 transitions. Word has length 80 [2022-04-06 17:22:01,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:22:01,045 INFO L478 AbstractCegarLoop]: Abstraction has 169 states and 196 transitions. [2022-04-06 17:22:01,045 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2022-04-06 17:22:01,045 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 196 transitions. [2022-04-06 17:22:01,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 17:22:01,046 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:22:01,046 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:22:01,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 17:22:01,259 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:01,259 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:22:01,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:22:01,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1035991527, now seen corresponding path program 3 times [2022-04-06 17:22:01,260 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:01,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1037285950] [2022-04-06 17:22:01,263 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:22:01,263 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:22:01,263 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:22:01,263 INFO L85 PathProgramCache]: Analyzing trace with hash 1035991527, now seen corresponding path program 4 times [2022-04-06 17:22:01,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:22:01,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527331285] [2022-04-06 17:22:01,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:22:01,264 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:22:01,271 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:22:01,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [342305826] [2022-04-06 17:22:01,271 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:22:01,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:01,271 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:22:01,273 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) [2022-04-06 17:22:01,298 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 17:22:01,328 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:22:01,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:22:01,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-06 17:22:01,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:22:01,561 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 44 proven. 5 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:01,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:22:01,729 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 38 proven. 11 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:01,730 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:22:01,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527331285] [2022-04-06 17:22:01,730 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:22:01,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342305826] [2022-04-06 17:22:01,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342305826] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:22:01,730 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:22:01,730 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2022-04-06 17:22:01,730 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:22:01,731 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1037285950] [2022-04-06 17:22:01,731 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1037285950] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:22:01,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:22:01,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 17:22:01,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639868603] [2022-04-06 17:22:01,731 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:22:01,731 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 17:22:01,731 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:01,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 17:22:01,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:22:01,732 INFO L87 Difference]: Start difference. First operand 169 states and 196 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2022-04-06 17:22:01,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:22:01,794 INFO L93 Difference]: Finished difference Result 197 states and 235 transitions. [2022-04-06 17:22:01,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 17:22:01,794 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 91 [2022-04-06 17:22:01,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:22:01,796 INFO L225 Difference]: With dead ends: 197 [2022-04-06 17:22:01,796 INFO L226 Difference]: Without dead ends: 184 [2022-04-06 17:22:01,796 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 175 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:22:01,797 INFO L913 BasicCegarLoop]: 60 mSDtfsCounter, 7 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:22:01,797 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 99 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:22:01,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-04-06 17:22:01,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 180. [2022-04-06 17:22:01,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 118 states have (on average 1.1694915254237288) internal successors, (138), 122 states have internal predecessors, (138), 39 states have call successors, (39), 23 states have call predecessors, (39), 22 states have return successors, (37), 34 states have call predecessors, (37), 37 states have call successors, (37) [2022-04-06 17:22:01,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 214 transitions. [2022-04-06 17:22:01,815 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 214 transitions. Word has length 91 [2022-04-06 17:22:01,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:22:01,816 INFO L478 AbstractCegarLoop]: Abstraction has 180 states and 214 transitions. [2022-04-06 17:22:01,816 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2022-04-06 17:22:01,816 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 214 transitions. [2022-04-06 17:22:01,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 17:22:01,817 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:22:01,817 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:22:01,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 17:22:02,031 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:02,032 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:22:02,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:22:02,032 INFO L85 PathProgramCache]: Analyzing trace with hash 1432051402, now seen corresponding path program 7 times [2022-04-06 17:22:02,032 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:02,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1351044511] [2022-04-06 17:22:02,035 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:22:02,035 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:22:02,035 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:22:02,035 INFO L85 PathProgramCache]: Analyzing trace with hash 1432051402, now seen corresponding path program 8 times [2022-04-06 17:22:02,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:22:02,036 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1254262176] [2022-04-06 17:22:02,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:22:02,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:22:02,042 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:22:02,042 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [690866722] [2022-04-06 17:22:02,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:22:02,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:02,042 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:22:02,043 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) [2022-04-06 17:22:02,051 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 17:22:02,098 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:22:02,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:22:02,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 17:22:02,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:22:02,254 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 72 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-04-06 17:22:02,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:22:02,449 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 26 proven. 44 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:02,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:22:02,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1254262176] [2022-04-06 17:22:02,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:22:02,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [690866722] [2022-04-06 17:22:02,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [690866722] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:22:02,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:22:02,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2022-04-06 17:22:02,450 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:22:02,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1351044511] [2022-04-06 17:22:02,450 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1351044511] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:22:02,450 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:22:02,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 17:22:02,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533860086] [2022-04-06 17:22:02,450 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:22:02,450 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 17:22:02,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:02,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 17:22:02,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:22:02,451 INFO L87 Difference]: Start difference. First operand 180 states and 214 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:22:02,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:22:02,547 INFO L93 Difference]: Finished difference Result 242 states and 300 transitions. [2022-04-06 17:22:02,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 17:22:02,547 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 91 [2022-04-06 17:22:02,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:22:02,548 INFO L225 Difference]: With dead ends: 242 [2022-04-06 17:22:02,548 INFO L226 Difference]: Without dead ends: 182 [2022-04-06 17:22:02,549 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=183, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:22:02,549 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 11 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:22:02,550 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 176 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:22:02,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-04-06 17:22:02,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 182. [2022-04-06 17:22:02,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 120 states have (on average 1.1666666666666667) internal successors, (140), 124 states have internal predecessors, (140), 39 states have call successors, (39), 23 states have call predecessors, (39), 22 states have return successors, (37), 34 states have call predecessors, (37), 37 states have call successors, (37) [2022-04-06 17:22:02,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 216 transitions. [2022-04-06 17:22:02,567 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 216 transitions. Word has length 91 [2022-04-06 17:22:02,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:22:02,567 INFO L478 AbstractCegarLoop]: Abstraction has 182 states and 216 transitions. [2022-04-06 17:22:02,568 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:22:02,568 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 216 transitions. [2022-04-06 17:22:02,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-04-06 17:22:02,568 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:22:02,569 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:22:02,588 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-04-06 17:22:02,779 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:02,779 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:22:02,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:22:02,780 INFO L85 PathProgramCache]: Analyzing trace with hash -614243194, now seen corresponding path program 5 times [2022-04-06 17:22:02,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:02,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [120962651] [2022-04-06 17:22:02,783 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:22:02,783 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:22:02,783 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:22:02,783 INFO L85 PathProgramCache]: Analyzing trace with hash -614243194, now seen corresponding path program 6 times [2022-04-06 17:22:02,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:22:02,783 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882172294] [2022-04-06 17:22:02,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:22:02,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:22:02,793 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:22:02,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6722722] [2022-04-06 17:22:02,793 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:22:02,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:02,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:22:02,795 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) [2022-04-06 17:22:02,802 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-06 17:22:02,891 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 17:22:02,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:22:02,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 230 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 17:22:02,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:22:03,086 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 26 proven. 296 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-04-06 17:22:03,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:22:03,287 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 26 proven. 28 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:03,287 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:22:03,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882172294] [2022-04-06 17:22:03,287 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:22:03,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6722722] [2022-04-06 17:22:03,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6722722] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:22:03,288 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:22:03,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-04-06 17:22:03,288 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:22:03,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [120962651] [2022-04-06 17:22:03,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [120962651] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:22:03,288 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:22:03,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:22:03,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992131280] [2022-04-06 17:22:03,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:22:03,289 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:22:03,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:03,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:22:03,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:22:03,289 INFO L87 Difference]: Start difference. First operand 182 states and 216 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:22:03,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:22:03,424 INFO L93 Difference]: Finished difference Result 240 states and 281 transitions. [2022-04-06 17:22:03,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 17:22:03,425 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 94 [2022-04-06 17:22:03,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:22:03,426 INFO L225 Difference]: With dead ends: 240 [2022-04-06 17:22:03,426 INFO L226 Difference]: Without dead ends: 227 [2022-04-06 17:22:03,427 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=186, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:22:03,427 INFO L913 BasicCegarLoop]: 52 mSDtfsCounter, 41 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:22:03,427 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 199 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:22:03,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-04-06 17:22:03,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2022-04-06 17:22:03,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 226 states, 151 states have (on average 1.1456953642384107) internal successors, (173), 155 states have internal predecessors, (173), 46 states have call successors, (46), 29 states have call predecessors, (46), 28 states have return successors, (44), 41 states have call predecessors, (44), 44 states have call successors, (44) [2022-04-06 17:22:03,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 263 transitions. [2022-04-06 17:22:03,448 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 263 transitions. Word has length 94 [2022-04-06 17:22:03,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:22:03,448 INFO L478 AbstractCegarLoop]: Abstraction has 226 states and 263 transitions. [2022-04-06 17:22:03,449 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:22:03,449 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 263 transitions. [2022-04-06 17:22:03,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-04-06 17:22:03,450 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:22:03,450 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:22:03,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-04-06 17:22:03,671 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:03,672 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:22:03,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:22:03,672 INFO L85 PathProgramCache]: Analyzing trace with hash -612515316, now seen corresponding path program 7 times [2022-04-06 17:22:03,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:03,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [370555541] [2022-04-06 17:22:03,675 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:22:03,675 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:22:03,675 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:22:03,675 INFO L85 PathProgramCache]: Analyzing trace with hash -612515316, now seen corresponding path program 8 times [2022-04-06 17:22:03,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:22:03,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257516879] [2022-04-06 17:22:03,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:22:03,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:22:03,696 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:22:03,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1135539946] [2022-04-06 17:22:03,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:22:03,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:03,696 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:22:03,697 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) [2022-04-06 17:22:03,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-04-06 17:22:03,759 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:22:03,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:22:03,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 17:22:03,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:22:04,275 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:04,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:22:27,412 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2022-04-06 17:22:27,412 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:22:27,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257516879] [2022-04-06 17:22:27,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:22:27,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135539946] [2022-04-06 17:22:27,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135539946] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:22:27,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:22:27,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2022-04-06 17:22:27,413 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:22:27,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [370555541] [2022-04-06 17:22:27,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [370555541] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:22:27,413 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:22:27,413 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 17:22:27,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953961760] [2022-04-06 17:22:27,413 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:22:27,413 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 17:22:27,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:27,414 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 17:22:27,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:22:27,414 INFO L87 Difference]: Start difference. First operand 226 states and 263 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-04-06 17:22:27,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:22:27,743 INFO L93 Difference]: Finished difference Result 275 states and 329 transitions. [2022-04-06 17:22:27,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 17:22:27,744 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2022-04-06 17:22:27,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:22:27,745 INFO L225 Difference]: With dead ends: 275 [2022-04-06 17:22:27,745 INFO L226 Difference]: Without dead ends: 240 [2022-04-06 17:22:27,746 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2022-04-06 17:22:27,746 INFO L913 BasicCegarLoop]: 58 mSDtfsCounter, 13 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:22:27,747 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 302 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:22:27,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2022-04-06 17:22:27,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 238. [2022-04-06 17:22:27,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 159 states have (on average 1.150943396226415) internal successors, (183), 163 states have internal predecessors, (183), 48 states have call successors, (48), 31 states have call predecessors, (48), 30 states have return successors, (46), 43 states have call predecessors, (46), 46 states have call successors, (46) [2022-04-06 17:22:27,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 277 transitions. [2022-04-06 17:22:27,767 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 277 transitions. Word has length 94 [2022-04-06 17:22:27,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:22:27,768 INFO L478 AbstractCegarLoop]: Abstraction has 238 states and 277 transitions. [2022-04-06 17:22:27,768 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2022-04-06 17:22:27,768 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 277 transitions. [2022-04-06 17:22:27,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-04-06 17:22:27,769 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:22:27,769 INFO L499 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:22:27,796 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-04-06 17:22:27,982 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:27,982 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:22:27,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:22:27,982 INFO L85 PathProgramCache]: Analyzing trace with hash 18113303, now seen corresponding path program 9 times [2022-04-06 17:22:27,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:22:27,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [748397090] [2022-04-06 17:22:27,985 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:22:27,985 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:22:27,986 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:22:27,986 INFO L85 PathProgramCache]: Analyzing trace with hash 18113303, now seen corresponding path program 10 times [2022-04-06 17:22:27,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:22:27,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060291676] [2022-04-06 17:22:27,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:22:27,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:22:27,993 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:22:27,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1064639678] [2022-04-06 17:22:27,993 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:22:27,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:22:27,993 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:22:27,994 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) [2022-04-06 17:22:28,006 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-04-06 17:22:28,069 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:22:28,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:22:28,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 40 conjunts are in the unsatisfiable core [2022-04-06 17:22:28,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:22:55,346 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 104 proven. 53 refuted. 2 times theorem prover too weak. 265 trivial. 0 not checked. [2022-04-06 17:22:55,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:23:22,757 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse13 (div c_main_~p~0 2)) (.cse4 (= (mod c_main_~d~0 2) 0)) (.cse24 (< c_main_~d~0 0)) (.cse2 (div c_main_~d~0 2))) (let ((.cse3 (+ .cse2 1)) (.cse5 (not .cse24)) (.cse0 (and .cse24 (not .cse4))) (.cse12 (* c_main_~B~0 .cse13)) (.cse6 (= (mod c_main_~p~0 2) 0)) (.cse8 (< c_main_~p~0 0))) (and (let ((.cse7 (+ .cse13 1))) (let ((.cse1 (* c_main_~B~0 .cse7))) (or (and (or .cse0 (not (= .cse1 .cse2))) (or (not (= .cse1 .cse3)) .cse4 .cse5)) .cse6 (= (mod .cse7 2) 0) (not .cse8) (let ((.cse11 (< (+ .cse12 c_main_~B~0) 0)) (.cse9 (* c_main_~B~0 (+ (div .cse7 2) 1))) (.cse10 (div .cse1 2))) (and (or (= .cse9 .cse10) (and .cse11 (not (= 0 (mod .cse1 2))))) (or (not .cse11) (= .cse9 (+ .cse10 1)))))))) (or (and (or (not (= .cse3 .cse12)) .cse4 .cse5) (or .cse0 (not (= .cse12 .cse2)))) (let ((.cse19 (div .cse12 2)) (.cse23 (< .cse12 0)) (.cse17 (= (mod .cse12 2) 0))) (let ((.cse21 (< .cse13 0)) (.cse18 (and .cse23 (not .cse17))) (.cse16 (not .cse23)) (.cse14 (+ .cse19 1)) (.cse20 (div .cse13 2))) (and (or (let ((.cse15 (* c_main_~B~0 .cse20))) (and (or (= .cse14 .cse15) .cse16 .cse17) (or .cse18 (= .cse19 .cse15)))) .cse21) (or (not .cse21) (= (mod .cse13 2) 0) (let ((.cse22 (* (+ .cse20 1) c_main_~B~0))) (and (or (= .cse19 .cse22) .cse18) (or .cse16 (= .cse14 .cse22)))))))) (and (not .cse6) .cse8))))) is different from true [2022-04-06 17:24:06,827 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 101 proven. 30 refuted. 0 times theorem prover too weak. 292 trivial. 1 not checked. [2022-04-06 17:24:06,827 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:06,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060291676] [2022-04-06 17:24:06,827 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:06,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064639678] [2022-04-06 17:24:06,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064639678] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:06,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:06,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 20 [2022-04-06 17:24:06,828 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:06,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [748397090] [2022-04-06 17:24:06,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [748397090] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:06,828 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:06,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 17:24:06,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468548460] [2022-04-06 17:24:06,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:06,829 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 17:24:06,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:06,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 17:24:06,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=265, Unknown=5, NotChecked=34, Total=380 [2022-04-06 17:24:06,829 INFO L87 Difference]: Start difference. First operand 238 states and 277 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 6 states have call successors, (15) [2022-04-06 17:24:17,154 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:18,971 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:20,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.31s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:31,276 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:33,874 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:35,192 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:37,263 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:39,266 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:40,960 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.69s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:42,274 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:44,288 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:47,567 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.47s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:24:47,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:47,589 INFO L93 Difference]: Finished difference Result 277 states and 336 transitions. [2022-04-06 17:24:47,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 17:24:47,589 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 6 states have call successors, (15) Word has length 99 [2022-04-06 17:24:47,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:47,591 INFO L225 Difference]: With dead ends: 277 [2022-04-06 17:24:47,591 INFO L226 Difference]: Without dead ends: 275 [2022-04-06 17:24:47,591 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 179 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 58.6s TimeCoverageRelationStatistics Valid=109, Invalid=392, Unknown=9, NotChecked=42, Total=552 [2022-04-06 17:24:47,592 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 46 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 28 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 23.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 464 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 23.5s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:47,592 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 240 Invalid, 464 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 314 Invalid, 6 Unknown, 116 Unchecked, 23.5s Time] [2022-04-06 17:24:47,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 275 states. [2022-04-06 17:24:47,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 275 to 258. [2022-04-06 17:24:47,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 258 states, 171 states have (on average 1.1578947368421053) internal successors, (198), 177 states have internal predecessors, (198), 54 states have call successors, (54), 33 states have call predecessors, (54), 32 states have return successors, (52), 47 states have call predecessors, (52), 52 states have call successors, (52) [2022-04-06 17:24:47,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 258 states to 258 states and 304 transitions. [2022-04-06 17:24:47,629 INFO L78 Accepts]: Start accepts. Automaton has 258 states and 304 transitions. Word has length 99 [2022-04-06 17:24:47,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:47,629 INFO L478 AbstractCegarLoop]: Abstraction has 258 states and 304 transitions. [2022-04-06 17:24:47,629 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 6 states have call successors, (15) [2022-04-06 17:24:47,630 INFO L276 IsEmpty]: Start isEmpty. Operand 258 states and 304 transitions. [2022-04-06 17:24:47,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-04-06 17:24:47,631 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:47,631 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:47,658 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:47,843 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:47,843 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:47,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:47,844 INFO L85 PathProgramCache]: Analyzing trace with hash 1358295611, now seen corresponding path program 5 times [2022-04-06 17:24:47,844 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:47,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [166752129] [2022-04-06 17:24:47,847 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:47,847 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:47,847 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:47,847 INFO L85 PathProgramCache]: Analyzing trace with hash 1358295611, now seen corresponding path program 6 times [2022-04-06 17:24:47,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:47,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115890343] [2022-04-06 17:24:47,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:47,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:47,871 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:47,871 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [343155782] [2022-04-06 17:24:47,871 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:24:47,871 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:47,871 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:47,872 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) [2022-04-06 17:24:47,873 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-04-06 17:24:47,941 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 17:24:47,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:47,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 17:24:47,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:48,150 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 108 proven. 4 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2022-04-06 17:24:48,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:48,368 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 110 proven. 2 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2022-04-06 17:24:48,368 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:48,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115890343] [2022-04-06 17:24:48,368 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:48,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343155782] [2022-04-06 17:24:48,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343155782] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:48,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:48,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2022-04-06 17:24:48,369 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:48,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [166752129] [2022-04-06 17:24:48,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [166752129] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:48,369 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:48,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 17:24:48,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615477303] [2022-04-06 17:24:48,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:48,369 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 17:24:48,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:48,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 17:24:48,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:24:48,370 INFO L87 Difference]: Start difference. First operand 258 states and 304 transitions. Second operand has 10 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2022-04-06 17:24:48,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:48,536 INFO L93 Difference]: Finished difference Result 275 states and 320 transitions. [2022-04-06 17:24:48,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:24:48,537 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 105 [2022-04-06 17:24:48,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:48,539 INFO L225 Difference]: With dead ends: 275 [2022-04-06 17:24:48,539 INFO L226 Difference]: Without dead ends: 270 [2022-04-06 17:24:48,539 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 196 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:24:48,540 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 37 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 109 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:48,540 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 109 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:48,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2022-04-06 17:24:48,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 259. [2022-04-06 17:24:48,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 173 states have (on average 1.1271676300578035) internal successors, (195), 179 states have internal predecessors, (195), 51 states have call successors, (51), 35 states have call predecessors, (51), 34 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-04-06 17:24:48,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 295 transitions. [2022-04-06 17:24:48,578 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 295 transitions. Word has length 105 [2022-04-06 17:24:48,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:48,578 INFO L478 AbstractCegarLoop]: Abstraction has 259 states and 295 transitions. [2022-04-06 17:24:48,578 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2022-04-06 17:24:48,578 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 295 transitions. [2022-04-06 17:24:48,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-04-06 17:24:48,579 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:48,579 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:48,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:48,799 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,SelfDestructingSolverStorable23 [2022-04-06 17:24:48,799 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:48,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:48,800 INFO L85 PathProgramCache]: Analyzing trace with hash 1894816690, now seen corresponding path program 7 times [2022-04-06 17:24:48,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:48,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [242774115] [2022-04-06 17:24:48,803 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:48,803 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:48,803 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:48,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1894816690, now seen corresponding path program 8 times [2022-04-06 17:24:48,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:48,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821254220] [2022-04-06 17:24:48,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:48,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:48,814 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:48,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1961108721] [2022-04-06 17:24:48,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:24:48,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:48,815 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:48,816 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) [2022-04-06 17:24:48,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-04-06 17:24:48,874 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:24:48,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:48,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 17:24:48,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:49,057 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 414 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2022-04-06 17:24:49,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:49,297 INFO L134 CoverageAnalysis]: Checked inductivity of 492 backedges. 30 proven. 42 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-04-06 17:24:49,297 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:49,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821254220] [2022-04-06 17:24:49,297 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:49,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961108721] [2022-04-06 17:24:49,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961108721] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:49,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:49,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2022-04-06 17:24:49,298 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:49,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [242774115] [2022-04-06 17:24:49,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [242774115] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:49,298 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:49,298 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 17:24:49,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135339257] [2022-04-06 17:24:49,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:49,298 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 17:24:49,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:49,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 17:24:49,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:24:49,299 INFO L87 Difference]: Start difference. First operand 259 states and 295 transitions. Second operand has 10 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 9 states have call successors, (18), 9 states have call predecessors, (18), 7 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2022-04-06 17:24:49,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:49,480 INFO L93 Difference]: Finished difference Result 335 states and 381 transitions. [2022-04-06 17:24:49,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 17:24:49,481 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 9 states have call successors, (18), 9 states have call predecessors, (18), 7 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) Word has length 108 [2022-04-06 17:24:49,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:49,483 INFO L225 Difference]: With dead ends: 335 [2022-04-06 17:24:49,483 INFO L226 Difference]: Without dead ends: 322 [2022-04-06 17:24:49,483 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=253, Unknown=0, NotChecked=0, Total=420 [2022-04-06 17:24:49,483 INFO L913 BasicCegarLoop]: 56 mSDtfsCounter, 63 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:49,484 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 192 Invalid, 229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:49,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-04-06 17:24:49,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 321. [2022-04-06 17:24:49,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 220 states have (on average 1.1181818181818182) internal successors, (246), 225 states have internal predecessors, (246), 58 states have call successors, (58), 43 states have call predecessors, (58), 42 states have return successors, (56), 52 states have call predecessors, (56), 56 states have call successors, (56) [2022-04-06 17:24:49,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 360 transitions. [2022-04-06 17:24:49,530 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 360 transitions. Word has length 108 [2022-04-06 17:24:49,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:49,530 INFO L478 AbstractCegarLoop]: Abstraction has 321 states and 360 transitions. [2022-04-06 17:24:49,530 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.7) internal successors, (47), 9 states have internal predecessors, (47), 9 states have call successors, (18), 9 states have call predecessors, (18), 7 states have return successors, (16), 7 states have call predecessors, (16), 7 states have call successors, (16) [2022-04-06 17:24:49,530 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 360 transitions. [2022-04-06 17:24:49,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-04-06 17:24:49,532 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:49,532 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:49,559 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-04-06 17:24:49,751 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,SelfDestructingSolverStorable24 [2022-04-06 17:24:49,751 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:49,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:49,752 INFO L85 PathProgramCache]: Analyzing trace with hash 522560651, now seen corresponding path program 1 times [2022-04-06 17:24:49,752 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:49,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1793156751] [2022-04-06 17:24:49,755 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:49,755 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:49,755 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:49,755 INFO L85 PathProgramCache]: Analyzing trace with hash 522560651, now seen corresponding path program 2 times [2022-04-06 17:24:49,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:49,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922487593] [2022-04-06 17:24:49,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:49,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:49,763 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:49,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1364241678] [2022-04-06 17:24:49,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:24:49,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:49,764 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:49,765 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) [2022-04-06 17:24:49,766 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-04-06 17:24:49,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:24:49,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:49,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 17:24:49,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:50,043 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 150 proven. 430 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-04-06 17:24:50,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:50,280 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 34 proven. 70 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2022-04-06 17:24:50,280 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:50,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922487593] [2022-04-06 17:24:50,280 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:50,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364241678] [2022-04-06 17:24:50,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364241678] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:50,280 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:50,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2022-04-06 17:24:50,281 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:50,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1793156751] [2022-04-06 17:24:50,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1793156751] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:50,281 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:50,281 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:24:50,281 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071622298] [2022-04-06 17:24:50,281 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:50,282 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:24:50,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:50,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:24:50,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=144, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:24:50,283 INFO L87 Difference]: Start difference. First operand 321 states and 360 transitions. Second operand has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2022-04-06 17:24:50,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:50,447 INFO L93 Difference]: Finished difference Result 384 states and 435 transitions. [2022-04-06 17:24:50,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-04-06 17:24:50,448 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 118 [2022-04-06 17:24:50,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:50,450 INFO L225 Difference]: With dead ends: 384 [2022-04-06 17:24:50,450 INFO L226 Difference]: Without dead ends: 319 [2022-04-06 17:24:50,451 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 221 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=249, Unknown=0, NotChecked=0, Total=420 [2022-04-06 17:24:50,451 INFO L913 BasicCegarLoop]: 51 mSDtfsCounter, 21 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:50,452 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 186 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:50,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2022-04-06 17:24:50,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 319. [2022-04-06 17:24:50,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 218 states have (on average 1.114678899082569) internal successors, (243), 223 states have internal predecessors, (243), 58 states have call successors, (58), 43 states have call predecessors, (58), 42 states have return successors, (56), 52 states have call predecessors, (56), 56 states have call successors, (56) [2022-04-06 17:24:50,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 357 transitions. [2022-04-06 17:24:50,498 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 357 transitions. Word has length 118 [2022-04-06 17:24:50,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:50,499 INFO L478 AbstractCegarLoop]: Abstraction has 319 states and 357 transitions. [2022-04-06 17:24:50,499 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.0) internal successors, (45), 8 states have internal predecessors, (45), 8 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2022-04-06 17:24:50,508 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 357 transitions. [2022-04-06 17:24:50,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-04-06 17:24:50,511 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:50,511 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:50,538 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:50,719 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-04-06 17:24:50,719 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:50,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:50,720 INFO L85 PathProgramCache]: Analyzing trace with hash 1632097758, now seen corresponding path program 9 times [2022-04-06 17:24:50,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:50,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1381869203] [2022-04-06 17:24:50,722 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:50,723 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:50,723 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:50,723 INFO L85 PathProgramCache]: Analyzing trace with hash 1632097758, now seen corresponding path program 10 times [2022-04-06 17:24:50,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:50,723 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790010298] [2022-04-06 17:24:50,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:50,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:50,730 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:50,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1507378405] [2022-04-06 17:24:50,731 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:24:50,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:50,731 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:50,732 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) [2022-04-06 17:24:50,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-04-06 17:24:50,844 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:24:50,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:50,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 314 conjuncts, 19 conjunts are in the unsatisfiable core [2022-04-06 17:24:50,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:51,051 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 34 proven. 554 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-04-06 17:24:51,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:51,312 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 34 proven. 62 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2022-04-06 17:24:51,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:51,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790010298] [2022-04-06 17:24:51,312 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:51,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507378405] [2022-04-06 17:24:51,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1507378405] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:51,312 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:51,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2022-04-06 17:24:51,313 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:51,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1381869203] [2022-04-06 17:24:51,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1381869203] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:51,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:51,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:24:51,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073233614] [2022-04-06 17:24:51,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:51,313 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:24:51,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:51,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:24:51,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=222, Unknown=0, NotChecked=0, Total=380 [2022-04-06 17:24:51,314 INFO L87 Difference]: Start difference. First operand 319 states and 357 transitions. Second operand has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 10 states have internal predecessors, (54), 10 states have call successors, (20), 10 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) [2022-04-06 17:24:51,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:51,497 INFO L93 Difference]: Finished difference Result 413 states and 471 transitions. [2022-04-06 17:24:51,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:24:51,498 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 10 states have internal predecessors, (54), 10 states have call successors, (20), 10 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) Word has length 122 [2022-04-06 17:24:51,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:51,500 INFO L225 Difference]: With dead ends: 413 [2022-04-06 17:24:51,501 INFO L226 Difference]: Without dead ends: 400 [2022-04-06 17:24:51,501 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 225 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=222, Invalid=330, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:24:51,502 INFO L913 BasicCegarLoop]: 61 mSDtfsCounter, 80 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:51,502 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 217 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:51,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-04-06 17:24:51,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 399. [2022-04-06 17:24:51,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 274 states have (on average 1.1131386861313868) internal successors, (305), 280 states have internal predecessors, (305), 73 states have call successors, (73), 52 states have call predecessors, (73), 51 states have return successors, (71), 66 states have call predecessors, (71), 71 states have call successors, (71) [2022-04-06 17:24:51,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 449 transitions. [2022-04-06 17:24:51,559 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 449 transitions. Word has length 122 [2022-04-06 17:24:51,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:51,559 INFO L478 AbstractCegarLoop]: Abstraction has 399 states and 449 transitions. [2022-04-06 17:24:51,560 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 4.909090909090909) internal successors, (54), 10 states have internal predecessors, (54), 10 states have call successors, (20), 10 states have call predecessors, (20), 8 states have return successors, (18), 8 states have call predecessors, (18), 8 states have call successors, (18) [2022-04-06 17:24:51,560 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 449 transitions. [2022-04-06 17:24:51,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-04-06 17:24:51,561 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:51,561 INFO L499 BasicCegarLoop]: trace histogram [21, 20, 20, 7, 6, 6, 6, 6, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:51,587 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:51,786 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:51,787 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:51,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:51,787 INFO L85 PathProgramCache]: Analyzing trace with hash -867526735, now seen corresponding path program 3 times [2022-04-06 17:24:51,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:51,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1561337000] [2022-04-06 17:24:51,790 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:51,790 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:51,790 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:51,791 INFO L85 PathProgramCache]: Analyzing trace with hash -867526735, now seen corresponding path program 4 times [2022-04-06 17:24:51,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:51,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32739067] [2022-04-06 17:24:51,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:51,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:51,798 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:51,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1489352150] [2022-04-06 17:24:51,798 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:24:51,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:51,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:51,802 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) [2022-04-06 17:24:51,818 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-04-06 17:24:51,867 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:24:51,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:51,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 17:24:51,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:52,135 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 180 proven. 642 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-04-06 17:24:52,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:52,384 INFO L134 CoverageAnalysis]: Checked inductivity of 904 backedges. 40 proven. 102 refuted. 0 times theorem prover too weak. 762 trivial. 0 not checked. [2022-04-06 17:24:52,384 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:52,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32739067] [2022-04-06 17:24:52,384 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:52,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489352150] [2022-04-06 17:24:52,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489352150] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:52,384 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:52,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2022-04-06 17:24:52,385 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:52,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1561337000] [2022-04-06 17:24:52,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1561337000] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:52,385 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:52,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 17:24:52,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227391507] [2022-04-06 17:24:52,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:52,385 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 17:24:52,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:52,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 17:24:52,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=181, Unknown=0, NotChecked=0, Total=306 [2022-04-06 17:24:52,386 INFO L87 Difference]: Start difference. First operand 399 states and 449 transitions. Second operand has 10 states, 10 states have (on average 5.1) internal successors, (51), 9 states have internal predecessors, (51), 9 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:24:52,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:52,556 INFO L93 Difference]: Finished difference Result 462 states and 524 transitions. [2022-04-06 17:24:52,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-04-06 17:24:52,557 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.1) internal successors, (51), 9 states have internal predecessors, (51), 9 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 136 [2022-04-06 17:24:52,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:52,559 INFO L225 Difference]: With dead ends: 462 [2022-04-06 17:24:52,559 INFO L226 Difference]: Without dead ends: 397 [2022-04-06 17:24:52,560 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 255 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=227, Invalid=325, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:24:52,560 INFO L913 BasicCegarLoop]: 56 mSDtfsCounter, 35 mSDsluCounter, 141 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:52,560 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 197 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:52,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2022-04-06 17:24:52,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2022-04-06 17:24:52,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 272 states have (on average 1.1102941176470589) internal successors, (302), 278 states have internal predecessors, (302), 73 states have call successors, (73), 52 states have call predecessors, (73), 51 states have return successors, (71), 66 states have call predecessors, (71), 71 states have call successors, (71) [2022-04-06 17:24:52,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 446 transitions. [2022-04-06 17:24:52,616 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 446 transitions. Word has length 136 [2022-04-06 17:24:52,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:52,617 INFO L478 AbstractCegarLoop]: Abstraction has 397 states and 446 transitions. [2022-04-06 17:24:52,617 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 5.1) internal successors, (51), 9 states have internal predecessors, (51), 9 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:24:52,617 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 446 transitions. [2022-04-06 17:24:52,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-04-06 17:24:52,618 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:52,618 INFO L499 BasicCegarLoop]: trace histogram [20, 19, 19, 6, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:52,650 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:52,827 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,SelfDestructingSolverStorable27 [2022-04-06 17:24:52,828 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:52,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:52,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1792552182, now seen corresponding path program 11 times [2022-04-06 17:24:52,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:52,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1950904870] [2022-04-06 17:24:52,831 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:52,831 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:52,832 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:52,832 INFO L85 PathProgramCache]: Analyzing trace with hash -1792552182, now seen corresponding path program 12 times [2022-04-06 17:24:52,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:52,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095280348] [2022-04-06 17:24:52,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:52,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:52,840 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:52,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1063664621] [2022-04-06 17:24:52,840 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:24:52,840 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:52,840 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:52,844 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) [2022-04-06 17:24:52,845 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-04-06 17:24:52,954 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-04-06 17:24:52,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:52,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 21 conjunts are in the unsatisfiable core [2022-04-06 17:24:52,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:53,211 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 38 proven. 716 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-04-06 17:24:53,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:53,534 INFO L134 CoverageAnalysis]: Checked inductivity of 810 backedges. 38 proven. 88 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2022-04-06 17:24:53,534 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:53,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095280348] [2022-04-06 17:24:53,534 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:53,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063664621] [2022-04-06 17:24:53,534 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063664621] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:53,534 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:53,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2022-04-06 17:24:53,535 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:53,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1950904870] [2022-04-06 17:24:53,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1950904870] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:53,535 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:53,535 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 17:24:53,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785085916] [2022-04-06 17:24:53,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:53,535 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 17:24:53,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:53,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 17:24:53,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2022-04-06 17:24:53,536 INFO L87 Difference]: Start difference. First operand 397 states and 446 transitions. Second operand has 12 states, 12 states have (on average 5.083333333333333) internal successors, (61), 11 states have internal predecessors, (61), 11 states have call successors, (22), 11 states have call predecessors, (22), 9 states have return successors, (20), 9 states have call predecessors, (20), 9 states have call successors, (20) [2022-04-06 17:24:53,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:53,774 INFO L93 Difference]: Finished difference Result 493 states and 564 transitions. [2022-04-06 17:24:53,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-06 17:24:53,775 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 5.083333333333333) internal successors, (61), 11 states have internal predecessors, (61), 11 states have call successors, (22), 11 states have call predecessors, (22), 9 states have return successors, (20), 9 states have call predecessors, (20), 9 states have call successors, (20) Word has length 136 [2022-04-06 17:24:53,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:53,777 INFO L225 Difference]: With dead ends: 493 [2022-04-06 17:24:53,778 INFO L226 Difference]: Without dead ends: 480 [2022-04-06 17:24:53,778 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=285, Invalid=417, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:24:53,779 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 102 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 150 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 102 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 150 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:53,779 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [102 Valid, 221 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [150 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:24:53,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2022-04-06 17:24:53,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 479. [2022-04-06 17:24:53,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 328 states have (on average 1.1097560975609757) internal successors, (364), 336 states have internal predecessors, (364), 90 states have call successors, (90), 61 states have call predecessors, (90), 60 states have return successors, (88), 81 states have call predecessors, (88), 88 states have call successors, (88) [2022-04-06 17:24:53,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 542 transitions. [2022-04-06 17:24:53,845 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 542 transitions. Word has length 136 [2022-04-06 17:24:53,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:53,845 INFO L478 AbstractCegarLoop]: Abstraction has 479 states and 542 transitions. [2022-04-06 17:24:53,845 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 5.083333333333333) internal successors, (61), 11 states have internal predecessors, (61), 11 states have call successors, (22), 11 states have call predecessors, (22), 9 states have return successors, (20), 9 states have call predecessors, (20), 9 states have call successors, (20) [2022-04-06 17:24:53,845 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 542 transitions. [2022-04-06 17:24:53,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2022-04-06 17:24:53,847 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:53,847 INFO L499 BasicCegarLoop]: trace histogram [22, 21, 21, 7, 6, 6, 6, 6, 6, 6, 6, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:53,869 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-04-06 17:24:54,063 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,SelfDestructingSolverStorable28 [2022-04-06 17:24:54,063 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:54,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:54,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1618957110, now seen corresponding path program 13 times [2022-04-06 17:24:54,064 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:54,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1603567970] [2022-04-06 17:24:54,067 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:54,067 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:54,067 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:54,067 INFO L85 PathProgramCache]: Analyzing trace with hash 1618957110, now seen corresponding path program 14 times [2022-04-06 17:24:54,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:54,067 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711006513] [2022-04-06 17:24:54,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:54,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:54,074 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:54,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1627929406] [2022-04-06 17:24:54,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:24:54,075 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:54,075 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:54,076 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) [2022-04-06 17:24:54,077 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-04-06 17:24:54,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:24:54,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:24:54,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 17:24:54,143 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:24:54,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1002 backedges. 42 proven. 900 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2022-04-06 17:24:54,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:24:54,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1002 backedges. 42 proven. 120 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2022-04-06 17:24:54,729 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:24:54,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711006513] [2022-04-06 17:24:54,729 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:24:54,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627929406] [2022-04-06 17:24:54,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627929406] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:24:54,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:24:54,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2022-04-06 17:24:54,729 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:24:54,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1603567970] [2022-04-06 17:24:54,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1603567970] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:24:54,729 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:24:54,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 17:24:54,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006377157] [2022-04-06 17:24:54,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:24:54,730 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 17:24:54,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:54,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 17:24:54,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:24:54,731 INFO L87 Difference]: Start difference. First operand 479 states and 542 transitions. Second operand has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (24), 12 states have call predecessors, (24), 10 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2022-04-06 17:24:55,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:24:55,021 INFO L93 Difference]: Finished difference Result 581 states and 670 transitions. [2022-04-06 17:24:55,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-04-06 17:24:55,021 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (24), 12 states have call predecessors, (24), 10 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) Word has length 150 [2022-04-06 17:24:55,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:24:55,024 INFO L225 Difference]: With dead ends: 581 [2022-04-06 17:24:55,025 INFO L226 Difference]: Without dead ends: 568 [2022-04-06 17:24:55,025 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=356, Invalid=514, Unknown=0, NotChecked=0, Total=870 [2022-04-06 17:24:55,026 INFO L913 BasicCegarLoop]: 71 mSDtfsCounter, 105 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:24:55,026 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 243 Invalid, 276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:24:55,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2022-04-06 17:24:55,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 567. [2022-04-06 17:24:55,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 388 states have (on average 1.1108247422680413) internal successors, (431), 398 states have internal predecessors, (431), 109 states have call successors, (109), 70 states have call predecessors, (109), 69 states have return successors, (107), 98 states have call predecessors, (107), 107 states have call successors, (107) [2022-04-06 17:24:55,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 647 transitions. [2022-04-06 17:24:55,105 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 647 transitions. Word has length 150 [2022-04-06 17:24:55,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:24:55,105 INFO L478 AbstractCegarLoop]: Abstraction has 567 states and 647 transitions. [2022-04-06 17:24:55,106 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 5.230769230769231) internal successors, (68), 12 states have internal predecessors, (68), 12 states have call successors, (24), 12 states have call predecessors, (24), 10 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2022-04-06 17:24:55,106 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 647 transitions. [2022-04-06 17:24:55,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-04-06 17:24:55,108 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:24:55,108 INFO L499 BasicCegarLoop]: trace histogram [24, 23, 23, 8, 7, 7, 7, 7, 7, 7, 7, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:24:55,132 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-04-06 17:24:55,332 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:55,333 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:24:55,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:24:55,333 INFO L85 PathProgramCache]: Analyzing trace with hash 778901090, now seen corresponding path program 15 times [2022-04-06 17:24:55,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:24:55,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1332944506] [2022-04-06 17:24:55,336 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:24:55,336 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:24:55,336 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:24:55,336 INFO L85 PathProgramCache]: Analyzing trace with hash 778901090, now seen corresponding path program 16 times [2022-04-06 17:24:55,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:24:55,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369101606] [2022-04-06 17:24:55,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:24:55,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:24:55,346 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:24:55,347 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1295250934] [2022-04-06 17:24:55,347 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:24:55,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:24:55,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:24:55,348 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) [2022-04-06 17:24:55,356 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-04-06 17:25:02,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:25:02,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:02,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 17:25:02,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:03,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1216 backedges. 46 proven. 1106 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-04-06 17:25:03,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:03,371 INFO L134 CoverageAnalysis]: Checked inductivity of 1216 backedges. 46 proven. 158 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2022-04-06 17:25:03,371 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:03,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369101606] [2022-04-06 17:25:03,371 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:03,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295250934] [2022-04-06 17:25:03,371 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295250934] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:03,371 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:03,371 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 24 [2022-04-06 17:25:03,372 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:03,372 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1332944506] [2022-04-06 17:25:03,372 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1332944506] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:03,372 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:03,372 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 17:25:03,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279031585] [2022-04-06 17:25:03,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:03,372 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 17:25:03,372 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:03,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 17:25:03,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:03,373 INFO L87 Difference]: Start difference. First operand 567 states and 647 transitions. Second operand has 14 states, 14 states have (on average 5.357142857142857) internal successors, (75), 13 states have internal predecessors, (75), 13 states have call successors, (26), 13 states have call predecessors, (26), 11 states have return successors, (24), 11 states have call predecessors, (24), 11 states have call successors, (24) [2022-04-06 17:25:03,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:03,744 INFO L93 Difference]: Finished difference Result 683 states and 791 transitions. [2022-04-06 17:25:03,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-04-06 17:25:03,745 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 5.357142857142857) internal successors, (75), 13 states have internal predecessors, (75), 13 states have call successors, (26), 13 states have call predecessors, (26), 11 states have return successors, (24), 11 states have call predecessors, (24), 11 states have call successors, (24) Word has length 164 [2022-04-06 17:25:03,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:03,750 INFO L225 Difference]: With dead ends: 683 [2022-04-06 17:25:03,750 INFO L226 Difference]: Without dead ends: 670 [2022-04-06 17:25:03,751 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 304 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=376, Invalid=554, Unknown=0, NotChecked=0, Total=930 [2022-04-06 17:25:03,751 INFO L913 BasicCegarLoop]: 76 mSDtfsCounter, 163 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:03,752 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 270 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:25:03,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2022-04-06 17:25:03,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 669. [2022-04-06 17:25:03,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 669 states, 458 states have (on average 1.111353711790393) internal successors, (509), 470 states have internal predecessors, (509), 130 states have call successors, (130), 81 states have call predecessors, (130), 80 states have return successors, (128), 117 states have call predecessors, (128), 128 states have call successors, (128) [2022-04-06 17:25:03,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 669 states to 669 states and 767 transitions. [2022-04-06 17:25:03,858 INFO L78 Accepts]: Start accepts. Automaton has 669 states and 767 transitions. Word has length 164 [2022-04-06 17:25:03,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:03,858 INFO L478 AbstractCegarLoop]: Abstraction has 669 states and 767 transitions. [2022-04-06 17:25:03,858 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 5.357142857142857) internal successors, (75), 13 states have internal predecessors, (75), 13 states have call successors, (26), 13 states have call predecessors, (26), 11 states have return successors, (24), 11 states have call predecessors, (24), 11 states have call successors, (24) [2022-04-06 17:25:03,859 INFO L276 IsEmpty]: Start isEmpty. Operand 669 states and 767 transitions. [2022-04-06 17:25:03,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-04-06 17:25:03,861 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:03,861 INFO L499 BasicCegarLoop]: trace histogram [26, 25, 25, 9, 8, 8, 8, 8, 8, 8, 8, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:03,871 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:04,071 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:04,072 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:04,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:04,072 INFO L85 PathProgramCache]: Analyzing trace with hash 759159950, now seen corresponding path program 17 times [2022-04-06 17:25:04,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:04,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [219323957] [2022-04-06 17:25:04,075 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:04,075 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:04,075 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:04,075 INFO L85 PathProgramCache]: Analyzing trace with hash 759159950, now seen corresponding path program 18 times [2022-04-06 17:25:04,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:04,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548135163] [2022-04-06 17:25:04,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:04,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:04,094 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:04,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1209767514] [2022-04-06 17:25:04,095 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:25:04,095 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:04,095 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:04,097 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) [2022-04-06 17:25:04,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-04-06 17:25:04,237 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-04-06 17:25:04,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:04,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 17:25:04,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:04,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1452 backedges. 723 proven. 34 refuted. 0 times theorem prover too weak. 695 trivial. 0 not checked. [2022-04-06 17:25:04,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:04,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1452 backedges. 149 proven. 28 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2022-04-06 17:25:04,884 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:04,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548135163] [2022-04-06 17:25:04,884 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:04,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209767514] [2022-04-06 17:25:04,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209767514] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:04,884 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:04,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2022-04-06 17:25:04,884 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:04,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [219323957] [2022-04-06 17:25:04,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [219323957] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:04,884 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:04,884 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:25:04,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449441477] [2022-04-06 17:25:04,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:04,885 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:25:04,885 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:04,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:25:04,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-04-06 17:25:04,886 INFO L87 Difference]: Start difference. First operand 669 states and 767 transitions. Second operand has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 5 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2022-04-06 17:25:05,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:05,032 INFO L93 Difference]: Finished difference Result 725 states and 832 transitions. [2022-04-06 17:25:05,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:25:05,033 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 5 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) Word has length 178 [2022-04-06 17:25:05,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:05,036 INFO L225 Difference]: With dead ends: 725 [2022-04-06 17:25:05,036 INFO L226 Difference]: Without dead ends: 571 [2022-04-06 17:25:05,036 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 349 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-04-06 17:25:05,037 INFO L913 BasicCegarLoop]: 65 mSDtfsCounter, 0 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:05,037 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 182 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:25:05,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2022-04-06 17:25:05,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 571. [2022-04-06 17:25:05,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 571 states, 389 states have (on average 1.1105398457583548) internal successors, (432), 400 states have internal predecessors, (432), 112 states have call successors, (112), 70 states have call predecessors, (112), 69 states have return successors, (110), 100 states have call predecessors, (110), 110 states have call successors, (110) [2022-04-06 17:25:05,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 654 transitions. [2022-04-06 17:25:05,122 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 654 transitions. Word has length 178 [2022-04-06 17:25:05,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:05,122 INFO L478 AbstractCegarLoop]: Abstraction has 571 states and 654 transitions. [2022-04-06 17:25:05,122 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 7.2) internal successors, (36), 5 states have internal predecessors, (36), 5 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2022-04-06 17:25:05,123 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 654 transitions. [2022-04-06 17:25:05,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-04-06 17:25:05,125 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:05,125 INFO L499 BasicCegarLoop]: trace histogram [28, 27, 27, 8, 7, 7, 7, 7, 7, 7, 7, 7, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:05,150 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:05,350 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:05,350 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:05,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:05,351 INFO L85 PathProgramCache]: Analyzing trace with hash 221596463, now seen corresponding path program 5 times [2022-04-06 17:25:05,351 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:05,351 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [660935497] [2022-04-06 17:25:05,354 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:05,354 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:05,354 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:05,354 INFO L85 PathProgramCache]: Analyzing trace with hash 221596463, now seen corresponding path program 6 times [2022-04-06 17:25:05,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:05,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990579523] [2022-04-06 17:25:05,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:05,354 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:05,361 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:05,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1024601842] [2022-04-06 17:25:05,362 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:25:05,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:05,362 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:05,363 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) [2022-04-06 17:25:05,364 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-04-06 17:25:05,418 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 17:25:05,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:05,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 17:25:05,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:05,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1622 backedges. 559 proven. 0 refuted. 0 times theorem prover too weak. 1063 trivial. 0 not checked. [2022-04-06 17:25:05,639 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:25:05,639 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:05,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990579523] [2022-04-06 17:25:05,639 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:05,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024601842] [2022-04-06 17:25:05,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024601842] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:05,639 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:05,639 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:25:05,639 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:05,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [660935497] [2022-04-06 17:25:05,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [660935497] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:05,640 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:05,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:25:05,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486645111] [2022-04-06 17:25:05,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:05,640 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:25:05,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:05,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:25:05,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:25:05,641 INFO L87 Difference]: Start difference. First operand 571 states and 654 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:25:05,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:05,720 INFO L93 Difference]: Finished difference Result 658 states and 741 transitions. [2022-04-06 17:25:05,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:25:05,720 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 182 [2022-04-06 17:25:05,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:05,722 INFO L225 Difference]: With dead ends: 658 [2022-04-06 17:25:05,722 INFO L226 Difference]: Without dead ends: 527 [2022-04-06 17:25:05,723 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:25:05,723 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 8 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:05,723 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 144 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:25:05,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2022-04-06 17:25:05,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 525. [2022-04-06 17:25:05,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 525 states, 356 states have (on average 1.0898876404494382) internal successors, (388), 366 states have internal predecessors, (388), 102 states have call successors, (102), 68 states have call predecessors, (102), 66 states have return successors, (99), 90 states have call predecessors, (99), 99 states have call successors, (99) [2022-04-06 17:25:05,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 525 states to 525 states and 589 transitions. [2022-04-06 17:25:05,805 INFO L78 Accepts]: Start accepts. Automaton has 525 states and 589 transitions. Word has length 182 [2022-04-06 17:25:05,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:05,806 INFO L478 AbstractCegarLoop]: Abstraction has 525 states and 589 transitions. [2022-04-06 17:25:05,806 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:25:05,806 INFO L276 IsEmpty]: Start isEmpty. Operand 525 states and 589 transitions. [2022-04-06 17:25:05,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2022-04-06 17:25:05,808 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:05,808 INFO L499 BasicCegarLoop]: trace histogram [27, 26, 26, 8, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:05,835 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:06,023 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:06,023 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:06,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:06,024 INFO L85 PathProgramCache]: Analyzing trace with hash -553486584, now seen corresponding path program 19 times [2022-04-06 17:25:06,024 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:06,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [654074763] [2022-04-06 17:25:06,026 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:06,026 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:06,026 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:06,027 INFO L85 PathProgramCache]: Analyzing trace with hash -553486584, now seen corresponding path program 20 times [2022-04-06 17:25:06,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:06,027 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256483664] [2022-04-06 17:25:06,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:06,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:06,034 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:06,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [974919603] [2022-04-06 17:25:06,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:25:06,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:06,035 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:06,039 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) [2022-04-06 17:25:06,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-04-06 17:25:06,154 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:25:06,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:06,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 27 conjunts are in the unsatisfiable core [2022-04-06 17:25:06,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:06,475 INFO L134 CoverageAnalysis]: Checked inductivity of 1528 backedges. 52 proven. 1400 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2022-04-06 17:25:06,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:06,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1528 backedges. 52 proven. 176 refuted. 0 times theorem prover too weak. 1300 trivial. 0 not checked. [2022-04-06 17:25:06,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:06,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256483664] [2022-04-06 17:25:06,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:06,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [974919603] [2022-04-06 17:25:06,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [974919603] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:06,830 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:06,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2022-04-06 17:25:06,831 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:06,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [654074763] [2022-04-06 17:25:06,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [654074763] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:06,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:06,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:25:06,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669302905] [2022-04-06 17:25:06,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:06,831 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:25:06,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:06,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:25:06,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:06,832 INFO L87 Difference]: Start difference. First operand 525 states and 589 transitions. Second operand has 15 states, 15 states have (on average 5.4) internal successors, (81), 14 states have internal predecessors, (81), 14 states have call successors, (29), 14 states have call predecessors, (29), 12 states have return successors, (27), 12 states have call predecessors, (27), 12 states have call successors, (27) [2022-04-06 17:25:07,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:07,235 INFO L93 Difference]: Finished difference Result 619 states and 701 transitions. [2022-04-06 17:25:07,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-04-06 17:25:07,236 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 5.4) internal successors, (81), 14 states have internal predecessors, (81), 14 states have call successors, (29), 14 states have call predecessors, (29), 12 states have return successors, (27), 12 states have call predecessors, (27), 12 states have call successors, (27) Word has length 182 [2022-04-06 17:25:07,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:07,238 INFO L225 Difference]: With dead ends: 619 [2022-04-06 17:25:07,238 INFO L226 Difference]: Without dead ends: 596 [2022-04-06 17:25:07,241 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 340 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=369, Invalid=561, Unknown=0, NotChecked=0, Total=930 [2022-04-06 17:25:07,241 INFO L913 BasicCegarLoop]: 79 mSDtfsCounter, 171 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 265 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 559 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 265 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:07,241 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 283 Invalid, 559 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [265 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:25:07,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2022-04-06 17:25:07,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 595. [2022-04-06 17:25:07,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 595 states, 403 states have (on average 1.0893300248138957) internal successors, (439), 415 states have internal predecessors, (439), 117 states have call successors, (117), 76 states have call predecessors, (117), 74 states have return successors, (114), 103 states have call predecessors, (114), 114 states have call successors, (114) [2022-04-06 17:25:07,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 595 states to 595 states and 670 transitions. [2022-04-06 17:25:07,329 INFO L78 Accepts]: Start accepts. Automaton has 595 states and 670 transitions. Word has length 182 [2022-04-06 17:25:07,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:07,329 INFO L478 AbstractCegarLoop]: Abstraction has 595 states and 670 transitions. [2022-04-06 17:25:07,330 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 5.4) internal successors, (81), 14 states have internal predecessors, (81), 14 states have call successors, (29), 14 states have call predecessors, (29), 12 states have return successors, (27), 12 states have call predecessors, (27), 12 states have call successors, (27) [2022-04-06 17:25:07,330 INFO L276 IsEmpty]: Start isEmpty. Operand 595 states and 670 transitions. [2022-04-06 17:25:07,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2022-04-06 17:25:07,331 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:07,331 INFO L499 BasicCegarLoop]: trace histogram [29, 28, 28, 9, 8, 8, 8, 8, 8, 8, 8, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:07,356 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:07,547 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,SelfDestructingSolverStorable33 [2022-04-06 17:25:07,547 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:07,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:07,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1093935796, now seen corresponding path program 21 times [2022-04-06 17:25:07,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:07,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1105987001] [2022-04-06 17:25:07,550 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:07,550 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:07,550 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:07,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1093935796, now seen corresponding path program 22 times [2022-04-06 17:25:07,550 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:07,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2049585225] [2022-04-06 17:25:07,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:07,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:07,557 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:07,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1166996142] [2022-04-06 17:25:07,557 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:25:07,558 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:07,558 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:07,558 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) [2022-04-06 17:25:07,559 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-04-06 17:25:14,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:25:14,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:14,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 29 conjunts are in the unsatisfiable core [2022-04-06 17:25:14,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:14,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1788 backedges. 56 proven. 1652 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2022-04-06 17:25:14,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:14,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1788 backedges. 56 proven. 220 refuted. 0 times theorem prover too weak. 1512 trivial. 0 not checked. [2022-04-06 17:25:14,797 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:14,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2049585225] [2022-04-06 17:25:14,797 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:14,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166996142] [2022-04-06 17:25:14,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166996142] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:14,797 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:14,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2022-04-06 17:25:14,797 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:14,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1105987001] [2022-04-06 17:25:14,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1105987001] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:14,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:14,798 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-04-06 17:25:14,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741583824] [2022-04-06 17:25:14,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:14,798 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-04-06 17:25:14,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:14,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-04-06 17:25:14,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:14,799 INFO L87 Difference]: Start difference. First operand 595 states and 670 transitions. Second operand has 16 states, 16 states have (on average 5.5) internal successors, (88), 15 states have internal predecessors, (88), 15 states have call successors, (31), 15 states have call predecessors, (31), 13 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) [2022-04-06 17:25:15,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:15,119 INFO L93 Difference]: Finished difference Result 689 states and 782 transitions. [2022-04-06 17:25:15,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 17:25:15,119 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.5) internal successors, (88), 15 states have internal predecessors, (88), 15 states have call successors, (31), 15 states have call predecessors, (31), 13 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) Word has length 196 [2022-04-06 17:25:15,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:15,122 INFO L225 Difference]: With dead ends: 689 [2022-04-06 17:25:15,122 INFO L226 Difference]: Without dead ends: 666 [2022-04-06 17:25:15,123 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 368 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=388, Invalid=604, Unknown=0, NotChecked=0, Total=992 [2022-04-06 17:25:15,123 INFO L913 BasicCegarLoop]: 84 mSDtfsCounter, 129 mSDsluCounter, 230 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 118 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 314 SdHoareTripleChecker+Invalid, 313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 118 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:15,124 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 314 Invalid, 313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [118 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:25:15,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 666 states. [2022-04-06 17:25:15,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 666 to 665. [2022-04-06 17:25:15,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 665 states, 450 states have (on average 1.0888888888888888) internal successors, (490), 464 states have internal predecessors, (490), 132 states have call successors, (132), 84 states have call predecessors, (132), 82 states have return successors, (129), 116 states have call predecessors, (129), 129 states have call successors, (129) [2022-04-06 17:25:15,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 665 states to 665 states and 751 transitions. [2022-04-06 17:25:15,216 INFO L78 Accepts]: Start accepts. Automaton has 665 states and 751 transitions. Word has length 196 [2022-04-06 17:25:15,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:15,216 INFO L478 AbstractCegarLoop]: Abstraction has 665 states and 751 transitions. [2022-04-06 17:25:15,216 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.5) internal successors, (88), 15 states have internal predecessors, (88), 15 states have call successors, (31), 15 states have call predecessors, (31), 13 states have return successors, (29), 13 states have call predecessors, (29), 13 states have call successors, (29) [2022-04-06 17:25:15,216 INFO L276 IsEmpty]: Start isEmpty. Operand 665 states and 751 transitions. [2022-04-06 17:25:15,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2022-04-06 17:25:15,218 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:15,219 INFO L499 BasicCegarLoop]: trace histogram [31, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:15,230 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:15,430 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:15,430 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:15,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:15,430 INFO L85 PathProgramCache]: Analyzing trace with hash 1762259296, now seen corresponding path program 23 times [2022-04-06 17:25:15,430 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:15,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2052861330] [2022-04-06 17:25:15,433 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:15,433 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:15,433 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:15,433 INFO L85 PathProgramCache]: Analyzing trace with hash 1762259296, now seen corresponding path program 24 times [2022-04-06 17:25:15,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:15,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772491350] [2022-04-06 17:25:15,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:15,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:15,440 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:15,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [205550946] [2022-04-06 17:25:15,440 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:25:15,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:15,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:15,441 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) [2022-04-06 17:25:15,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-04-06 17:25:15,582 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2022-04-06 17:25:15,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:15,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 17:25:15,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:15,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 966 proven. 69 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2022-04-06 17:25:15,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:16,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2070 backedges. 186 proven. 69 refuted. 0 times theorem prover too weak. 1815 trivial. 0 not checked. [2022-04-06 17:25:16,392 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:16,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772491350] [2022-04-06 17:25:16,392 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:16,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205550946] [2022-04-06 17:25:16,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205550946] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:16,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:16,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2022-04-06 17:25:16,393 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:16,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2052861330] [2022-04-06 17:25:16,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2052861330] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:16,393 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:16,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:25:16,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374101992] [2022-04-06 17:25:16,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:16,393 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:25:16,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:16,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:25:16,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-04-06 17:25:16,394 INFO L87 Difference]: Start difference. First operand 665 states and 751 transitions. Second operand has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 6 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 6 states have call predecessors, (23), 6 states have call successors, (23) [2022-04-06 17:25:16,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:16,522 INFO L93 Difference]: Finished difference Result 781 states and 891 transitions. [2022-04-06 17:25:16,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:25:16,523 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 6 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 6 states have call predecessors, (23), 6 states have call successors, (23) Word has length 210 [2022-04-06 17:25:16,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:16,525 INFO L225 Difference]: With dead ends: 781 [2022-04-06 17:25:16,525 INFO L226 Difference]: Without dead ends: 613 [2022-04-06 17:25:16,526 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 419 GetRequests, 410 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2022-04-06 17:25:16,526 INFO L913 BasicCegarLoop]: 80 mSDtfsCounter, 2 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:16,526 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 266 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:25:16,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2022-04-06 17:25:16,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 613. [2022-04-06 17:25:16,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 613 states, 415 states have (on average 1.0867469879518072) internal successors, (451), 427 states have internal predecessors, (451), 120 states have call successors, (120), 79 states have call predecessors, (120), 77 states have return successors, (117), 106 states have call predecessors, (117), 117 states have call successors, (117) [2022-04-06 17:25:16,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 688 transitions. [2022-04-06 17:25:16,633 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 688 transitions. Word has length 210 [2022-04-06 17:25:16,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:16,634 INFO L478 AbstractCegarLoop]: Abstraction has 613 states and 688 transitions. [2022-04-06 17:25:16,634 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 7.166666666666667) internal successors, (43), 6 states have internal predecessors, (43), 6 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 6 states have call predecessors, (23), 6 states have call successors, (23) [2022-04-06 17:25:16,634 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 688 transitions. [2022-04-06 17:25:16,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-04-06 17:25:16,637 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:16,637 INFO L499 BasicCegarLoop]: trace histogram [32, 31, 31, 9, 8, 8, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:16,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:16,859 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:16,859 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:16,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:16,860 INFO L85 PathProgramCache]: Analyzing trace with hash -567448742, now seen corresponding path program 25 times [2022-04-06 17:25:16,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:16,860 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1876870314] [2022-04-06 17:25:16,862 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:16,862 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:16,863 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:16,863 INFO L85 PathProgramCache]: Analyzing trace with hash -567448742, now seen corresponding path program 26 times [2022-04-06 17:25:16,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:16,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893251994] [2022-04-06 17:25:16,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:16,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:16,872 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:16,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1825531821] [2022-04-06 17:25:16,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:25:16,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:16,872 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:16,873 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) [2022-04-06 17:25:16,899 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-04-06 17:25:16,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:25:16,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:16,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 520 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 17:25:16,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:17,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2166 backedges. 62 proven. 2012 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-06 17:25:17,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:17,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2166 backedges. 62 proven. 244 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2022-04-06 17:25:17,791 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:17,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893251994] [2022-04-06 17:25:17,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:17,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825531821] [2022-04-06 17:25:17,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825531821] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:17,792 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:17,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 24 [2022-04-06 17:25:17,792 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:17,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1876870314] [2022-04-06 17:25:17,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1876870314] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:17,792 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:17,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-04-06 17:25:17,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144858023] [2022-04-06 17:25:17,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:17,792 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-04-06 17:25:17,793 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:17,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-04-06 17:25:17,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:17,793 INFO L87 Difference]: Start difference. First operand 613 states and 688 transitions. Second operand has 17 states, 17 states have (on average 5.529411764705882) internal successors, (94), 16 states have internal predecessors, (94), 16 states have call successors, (34), 16 states have call predecessors, (34), 14 states have return successors, (32), 14 states have call predecessors, (32), 14 states have call successors, (32) [2022-04-06 17:25:18,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:18,155 INFO L93 Difference]: Finished difference Result 707 states and 800 transitions. [2022-04-06 17:25:18,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-04-06 17:25:18,156 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 5.529411764705882) internal successors, (94), 16 states have internal predecessors, (94), 16 states have call successors, (34), 16 states have call predecessors, (34), 14 states have return successors, (32), 14 states have call predecessors, (32), 14 states have call successors, (32) Word has length 214 [2022-04-06 17:25:18,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:18,159 INFO L225 Difference]: With dead ends: 707 [2022-04-06 17:25:18,159 INFO L226 Difference]: Without dead ends: 684 [2022-04-06 17:25:18,160 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 404 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=380, Invalid=612, Unknown=0, NotChecked=0, Total=992 [2022-04-06 17:25:18,160 INFO L913 BasicCegarLoop]: 87 mSDtfsCounter, 133 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 132 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 325 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 132 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:18,160 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 325 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [132 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:25:18,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2022-04-06 17:25:18,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 683. [2022-04-06 17:25:18,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 683 states, 462 states have (on average 1.0865800865800865) internal successors, (502), 476 states have internal predecessors, (502), 135 states have call successors, (135), 87 states have call predecessors, (135), 85 states have return successors, (132), 119 states have call predecessors, (132), 132 states have call successors, (132) [2022-04-06 17:25:18,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 683 states to 683 states and 769 transitions. [2022-04-06 17:25:18,241 INFO L78 Accepts]: Start accepts. Automaton has 683 states and 769 transitions. Word has length 214 [2022-04-06 17:25:18,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:18,241 INFO L478 AbstractCegarLoop]: Abstraction has 683 states and 769 transitions. [2022-04-06 17:25:18,241 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 5.529411764705882) internal successors, (94), 16 states have internal predecessors, (94), 16 states have call successors, (34), 16 states have call predecessors, (34), 14 states have return successors, (32), 14 states have call predecessors, (32), 14 states have call successors, (32) [2022-04-06 17:25:18,241 INFO L276 IsEmpty]: Start isEmpty. Operand 683 states and 769 transitions. [2022-04-06 17:25:18,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2022-04-06 17:25:18,243 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:18,244 INFO L499 BasicCegarLoop]: trace histogram [34, 33, 33, 10, 9, 9, 9, 9, 9, 9, 9, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:18,271 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:18,464 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,SelfDestructingSolverStorable36 [2022-04-06 17:25:18,464 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:18,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:18,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1483480966, now seen corresponding path program 27 times [2022-04-06 17:25:18,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:18,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1117906219] [2022-04-06 17:25:18,467 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:18,467 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:18,467 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:18,467 INFO L85 PathProgramCache]: Analyzing trace with hash 1483480966, now seen corresponding path program 28 times [2022-04-06 17:25:18,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:18,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970353411] [2022-04-06 17:25:18,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:18,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:18,476 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:18,476 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [566872705] [2022-04-06 17:25:18,476 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:25:18,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:18,477 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:18,478 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) [2022-04-06 17:25:18,487 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-04-06 17:25:19,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:25:19,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:19,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 33 conjunts are in the unsatisfiable core [2022-04-06 17:25:19,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:20,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 66 proven. 2310 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2022-04-06 17:25:20,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:20,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2472 backedges. 66 proven. 294 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2022-04-06 17:25:20,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:20,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970353411] [2022-04-06 17:25:20,552 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:20,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [566872705] [2022-04-06 17:25:20,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [566872705] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:20,553 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:20,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 24 [2022-04-06 17:25:20,553 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:20,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1117906219] [2022-04-06 17:25:20,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1117906219] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:20,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:20,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 17:25:20,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273415038] [2022-04-06 17:25:20,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:20,554 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 17:25:20,554 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:20,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 17:25:20,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:20,554 INFO L87 Difference]: Start difference. First operand 683 states and 769 transitions. Second operand has 18 states, 18 states have (on average 5.611111111111111) internal successors, (101), 17 states have internal predecessors, (101), 17 states have call successors, (36), 17 states have call predecessors, (36), 15 states have return successors, (34), 15 states have call predecessors, (34), 15 states have call successors, (34) [2022-04-06 17:25:20,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:20,973 INFO L93 Difference]: Finished difference Result 777 states and 881 transitions. [2022-04-06 17:25:20,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-04-06 17:25:20,974 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.611111111111111) internal successors, (101), 17 states have internal predecessors, (101), 17 states have call successors, (36), 17 states have call predecessors, (36), 15 states have return successors, (34), 15 states have call predecessors, (34), 15 states have call successors, (34) Word has length 228 [2022-04-06 17:25:20,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:20,977 INFO L225 Difference]: With dead ends: 777 [2022-04-06 17:25:20,977 INFO L226 Difference]: Without dead ends: 754 [2022-04-06 17:25:20,978 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 464 GetRequests, 432 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=398, Invalid=658, Unknown=0, NotChecked=0, Total=1056 [2022-04-06 17:25:20,979 INFO L913 BasicCegarLoop]: 92 mSDtfsCounter, 178 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:20,979 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 348 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:25:20,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2022-04-06 17:25:21,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 753. [2022-04-06 17:25:21,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 753 states, 509 states have (on average 1.0864440078585462) internal successors, (553), 525 states have internal predecessors, (553), 150 states have call successors, (150), 95 states have call predecessors, (150), 93 states have return successors, (147), 132 states have call predecessors, (147), 147 states have call successors, (147) [2022-04-06 17:25:21,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 753 states to 753 states and 850 transitions. [2022-04-06 17:25:21,092 INFO L78 Accepts]: Start accepts. Automaton has 753 states and 850 transitions. Word has length 228 [2022-04-06 17:25:21,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:21,092 INFO L478 AbstractCegarLoop]: Abstraction has 753 states and 850 transitions. [2022-04-06 17:25:21,092 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.611111111111111) internal successors, (101), 17 states have internal predecessors, (101), 17 states have call successors, (36), 17 states have call predecessors, (36), 15 states have return successors, (34), 15 states have call predecessors, (34), 15 states have call successors, (34) [2022-04-06 17:25:21,092 INFO L276 IsEmpty]: Start isEmpty. Operand 753 states and 850 transitions. [2022-04-06 17:25:21,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2022-04-06 17:25:21,094 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:21,094 INFO L499 BasicCegarLoop]: trace histogram [36, 35, 35, 11, 10, 10, 10, 10, 10, 10, 10, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:21,103 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-04-06 17:25:21,295 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,SelfDestructingSolverStorable37 [2022-04-06 17:25:21,295 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:21,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:21,295 INFO L85 PathProgramCache]: Analyzing trace with hash -963242318, now seen corresponding path program 29 times [2022-04-06 17:25:21,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:21,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [938558880] [2022-04-06 17:25:21,298 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:21,298 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:21,298 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:21,298 INFO L85 PathProgramCache]: Analyzing trace with hash -963242318, now seen corresponding path program 30 times [2022-04-06 17:25:21,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:21,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377849171] [2022-04-06 17:25:21,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:21,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:21,307 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:21,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886243554] [2022-04-06 17:25:21,307 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:25:21,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:21,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:21,310 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) [2022-04-06 17:25:21,312 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-04-06 17:25:21,500 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-04-06 17:25:21,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:21,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 496 conjuncts, 19 conjunts are in the unsatisfiable core [2022-04-06 17:25:21,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:21,834 INFO L134 CoverageAnalysis]: Checked inductivity of 2800 backedges. 1209 proven. 116 refuted. 0 times theorem prover too weak. 1475 trivial. 0 not checked. [2022-04-06 17:25:21,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:22,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2800 backedges. 229 proven. 116 refuted. 0 times theorem prover too weak. 2455 trivial. 0 not checked. [2022-04-06 17:25:22,467 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:22,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377849171] [2022-04-06 17:25:22,468 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:22,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886243554] [2022-04-06 17:25:22,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886243554] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:22,468 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:22,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2022-04-06 17:25:22,468 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:22,468 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [938558880] [2022-04-06 17:25:22,468 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [938558880] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:22,468 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:22,468 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 17:25:22,468 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646101897] [2022-04-06 17:25:22,468 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:22,469 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 17:25:22,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:22,469 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 17:25:22,469 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:25:22,469 INFO L87 Difference]: Start difference. First operand 753 states and 850 transitions. Second operand has 7 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 7 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) [2022-04-06 17:25:22,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:22,669 INFO L93 Difference]: Finished difference Result 881 states and 1008 transitions. [2022-04-06 17:25:22,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:25:22,670 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 7 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) Word has length 242 [2022-04-06 17:25:22,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:22,673 INFO L225 Difference]: With dead ends: 881 [2022-04-06 17:25:22,673 INFO L226 Difference]: Without dead ends: 701 [2022-04-06 17:25:22,674 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 472 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:25:22,675 INFO L913 BasicCegarLoop]: 95 mSDtfsCounter, 3 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 220 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:22,675 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 367 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 220 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:25:22,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2022-04-06 17:25:22,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 701. [2022-04-06 17:25:22,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 701 states, 474 states have (on average 1.0843881856540085) internal successors, (514), 488 states have internal predecessors, (514), 138 states have call successors, (138), 90 states have call predecessors, (138), 88 states have return successors, (135), 122 states have call predecessors, (135), 135 states have call successors, (135) [2022-04-06 17:25:22,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 701 states to 701 states and 787 transitions. [2022-04-06 17:25:22,767 INFO L78 Accepts]: Start accepts. Automaton has 701 states and 787 transitions. Word has length 242 [2022-04-06 17:25:22,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:22,767 INFO L478 AbstractCegarLoop]: Abstraction has 701 states and 787 transitions. [2022-04-06 17:25:22,768 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.142857142857143) internal successors, (50), 7 states have internal predecessors, (50), 7 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) [2022-04-06 17:25:22,768 INFO L276 IsEmpty]: Start isEmpty. Operand 701 states and 787 transitions. [2022-04-06 17:25:22,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 247 [2022-04-06 17:25:22,770 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:22,770 INFO L499 BasicCegarLoop]: trace histogram [37, 36, 36, 10, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:22,798 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:22,995 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,SelfDestructingSolverStorable38 [2022-04-06 17:25:22,996 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:22,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:22,996 INFO L85 PathProgramCache]: Analyzing trace with hash 405360684, now seen corresponding path program 31 times [2022-04-06 17:25:22,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:22,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2000875680] [2022-04-06 17:25:23,000 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:23,000 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:23,000 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:23,000 INFO L85 PathProgramCache]: Analyzing trace with hash 405360684, now seen corresponding path program 32 times [2022-04-06 17:25:23,000 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:23,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567543390] [2022-04-06 17:25:23,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:23,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:23,013 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:23,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [692629348] [2022-04-06 17:25:23,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:25:23,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:23,014 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:23,014 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) [2022-04-06 17:25:23,016 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-04-06 17:25:23,113 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:25:23,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:23,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 590 conjuncts, 35 conjunts are in the unsatisfiable core [2022-04-06 17:25:23,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:23,559 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 72 proven. 2736 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2022-04-06 17:25:23,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:23,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 72 proven. 324 refuted. 0 times theorem prover too weak. 2520 trivial. 0 not checked. [2022-04-06 17:25:23,968 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:23,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567543390] [2022-04-06 17:25:23,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:23,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692629348] [2022-04-06 17:25:23,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692629348] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:23,969 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:23,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 24 [2022-04-06 17:25:23,969 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:23,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2000875680] [2022-04-06 17:25:23,969 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2000875680] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:23,969 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:23,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-04-06 17:25:23,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287809714] [2022-04-06 17:25:23,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:23,970 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-04-06 17:25:23,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:23,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-04-06 17:25:23,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:23,971 INFO L87 Difference]: Start difference. First operand 701 states and 787 transitions. Second operand has 19 states, 19 states have (on average 5.631578947368421) internal successors, (107), 18 states have internal predecessors, (107), 18 states have call successors, (39), 18 states have call predecessors, (39), 16 states have return successors, (37), 16 states have call predecessors, (37), 16 states have call successors, (37) [2022-04-06 17:25:24,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:24,438 INFO L93 Difference]: Finished difference Result 795 states and 899 transitions. [2022-04-06 17:25:24,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-04-06 17:25:24,439 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 5.631578947368421) internal successors, (107), 18 states have internal predecessors, (107), 18 states have call successors, (39), 18 states have call predecessors, (39), 16 states have return successors, (37), 16 states have call predecessors, (37), 16 states have call successors, (37) Word has length 246 [2022-04-06 17:25:24,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:24,442 INFO L225 Difference]: With dead ends: 795 [2022-04-06 17:25:24,442 INFO L226 Difference]: Without dead ends: 772 [2022-04-06 17:25:24,443 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 468 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=389, Invalid=667, Unknown=0, NotChecked=0, Total=1056 [2022-04-06 17:25:24,443 INFO L913 BasicCegarLoop]: 95 mSDtfsCounter, 137 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 330 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 398 SdHoareTripleChecker+Invalid, 470 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 330 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:24,443 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 398 Invalid, 470 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 330 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:25:24,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2022-04-06 17:25:24,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 771. [2022-04-06 17:25:24,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 771 states, 521 states have (on average 1.0844529750479845) internal successors, (565), 537 states have internal predecessors, (565), 153 states have call successors, (153), 98 states have call predecessors, (153), 96 states have return successors, (150), 135 states have call predecessors, (150), 150 states have call successors, (150) [2022-04-06 17:25:24,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 771 states to 771 states and 868 transitions. [2022-04-06 17:25:24,556 INFO L78 Accepts]: Start accepts. Automaton has 771 states and 868 transitions. Word has length 246 [2022-04-06 17:25:24,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:24,557 INFO L478 AbstractCegarLoop]: Abstraction has 771 states and 868 transitions. [2022-04-06 17:25:24,557 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 5.631578947368421) internal successors, (107), 18 states have internal predecessors, (107), 18 states have call successors, (39), 18 states have call predecessors, (39), 16 states have return successors, (37), 16 states have call predecessors, (37), 16 states have call successors, (37) [2022-04-06 17:25:24,557 INFO L276 IsEmpty]: Start isEmpty. Operand 771 states and 868 transitions. [2022-04-06 17:25:24,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-04-06 17:25:24,560 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:24,560 INFO L499 BasicCegarLoop]: trace histogram [39, 38, 38, 11, 10, 10, 10, 10, 10, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:24,585 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-04-06 17:25:24,785 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-04-06 17:25:24,785 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:24,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:24,786 INFO L85 PathProgramCache]: Analyzing trace with hash 533081304, now seen corresponding path program 33 times [2022-04-06 17:25:24,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:24,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1243123063] [2022-04-06 17:25:24,788 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:24,788 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:24,788 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:24,789 INFO L85 PathProgramCache]: Analyzing trace with hash 533081304, now seen corresponding path program 34 times [2022-04-06 17:25:24,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:24,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083146449] [2022-04-06 17:25:24,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:24,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:24,797 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:24,798 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1604600955] [2022-04-06 17:25:24,798 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:25:24,798 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:24,798 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:24,800 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) [2022-04-06 17:25:24,801 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-04-06 17:25:31,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:25:31,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:31,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 623 conjuncts, 37 conjunts are in the unsatisfiable core [2022-04-06 17:25:31,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:31,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 76 proven. 3080 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-04-06 17:25:31,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:31,978 INFO L134 CoverageAnalysis]: Checked inductivity of 3268 backedges. 76 proven. 380 refuted. 0 times theorem prover too weak. 2812 trivial. 0 not checked. [2022-04-06 17:25:31,978 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:31,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083146449] [2022-04-06 17:25:31,978 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:31,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604600955] [2022-04-06 17:25:31,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604600955] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:31,979 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:31,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 24 [2022-04-06 17:25:31,979 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:31,979 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1243123063] [2022-04-06 17:25:31,979 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1243123063] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:31,979 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:31,979 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-04-06 17:25:31,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784642202] [2022-04-06 17:25:31,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:31,980 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-04-06 17:25:31,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:31,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-04-06 17:25:31,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:31,980 INFO L87 Difference]: Start difference. First operand 771 states and 868 transitions. Second operand has 20 states, 20 states have (on average 5.7) internal successors, (114), 19 states have internal predecessors, (114), 19 states have call successors, (41), 19 states have call predecessors, (41), 17 states have return successors, (39), 17 states have call predecessors, (39), 17 states have call successors, (39) [2022-04-06 17:25:32,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:32,474 INFO L93 Difference]: Finished difference Result 865 states and 980 transitions. [2022-04-06 17:25:32,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-04-06 17:25:32,475 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.7) internal successors, (114), 19 states have internal predecessors, (114), 19 states have call successors, (41), 19 states have call predecessors, (41), 17 states have return successors, (39), 17 states have call predecessors, (39), 17 states have call successors, (39) Word has length 260 [2022-04-06 17:25:32,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:32,477 INFO L225 Difference]: With dead ends: 865 [2022-04-06 17:25:32,477 INFO L226 Difference]: Without dead ends: 842 [2022-04-06 17:25:32,478 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 496 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=406, Invalid=716, Unknown=0, NotChecked=0, Total=1122 [2022-04-06 17:25:32,478 INFO L913 BasicCegarLoop]: 100 mSDtfsCounter, 233 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 334 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 334 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:32,478 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 392 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [334 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:25:32,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-04-06 17:25:32,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 841. [2022-04-06 17:25:32,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 841 states, 568 states have (on average 1.0845070422535212) internal successors, (616), 586 states have internal predecessors, (616), 168 states have call successors, (168), 106 states have call predecessors, (168), 104 states have return successors, (165), 148 states have call predecessors, (165), 165 states have call successors, (165) [2022-04-06 17:25:32,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 841 states to 841 states and 949 transitions. [2022-04-06 17:25:32,599 INFO L78 Accepts]: Start accepts. Automaton has 841 states and 949 transitions. Word has length 260 [2022-04-06 17:25:32,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:32,599 INFO L478 AbstractCegarLoop]: Abstraction has 841 states and 949 transitions. [2022-04-06 17:25:32,600 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.7) internal successors, (114), 19 states have internal predecessors, (114), 19 states have call successors, (41), 19 states have call predecessors, (41), 17 states have return successors, (39), 17 states have call predecessors, (39), 17 states have call successors, (39) [2022-04-06 17:25:32,600 INFO L276 IsEmpty]: Start isEmpty. Operand 841 states and 949 transitions. [2022-04-06 17:25:32,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-04-06 17:25:32,602 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:32,603 INFO L499 BasicCegarLoop]: trace histogram [41, 40, 40, 12, 11, 11, 11, 11, 11, 11, 11, 6, 6, 6, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:32,615 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:32,812 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:32,812 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:32,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:32,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1793233788, now seen corresponding path program 35 times [2022-04-06 17:25:32,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:32,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2105718012] [2022-04-06 17:25:32,815 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:32,815 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:32,815 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:32,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1793233788, now seen corresponding path program 36 times [2022-04-06 17:25:32,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:32,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48214409] [2022-04-06 17:25:32,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:32,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:32,823 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:32,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [466213875] [2022-04-06 17:25:32,823 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:25:32,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:32,823 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:32,824 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) [2022-04-06 17:25:32,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-04-06 17:25:33,147 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2022-04-06 17:25:33,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:33,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 599 conjuncts, 24 conjunts are in the unsatisfiable core [2022-04-06 17:25:33,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:33,473 INFO L134 CoverageAnalysis]: Checked inductivity of 3642 backedges. 1452 proven. 175 refuted. 0 times theorem prover too weak. 2015 trivial. 0 not checked. [2022-04-06 17:25:33,473 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:34,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3642 backedges. 277 proven. 170 refuted. 0 times theorem prover too weak. 3195 trivial. 0 not checked. [2022-04-06 17:25:34,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:34,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48214409] [2022-04-06 17:25:34,310 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:34,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [466213875] [2022-04-06 17:25:34,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [466213875] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:34,310 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:34,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2022-04-06 17:25:34,310 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:34,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2105718012] [2022-04-06 17:25:34,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2105718012] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:34,310 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:34,310 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 17:25:34,310 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097639749] [2022-04-06 17:25:34,310 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:34,311 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 17:25:34,311 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:34,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 17:25:34,311 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-04-06 17:25:34,311 INFO L87 Difference]: Start difference. First operand 841 states and 949 transitions. Second operand has 8 states, 8 states have (on average 7.125) internal successors, (57), 8 states have internal predecessors, (57), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2022-04-06 17:25:34,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:34,563 INFO L93 Difference]: Finished difference Result 981 states and 1125 transitions. [2022-04-06 17:25:34,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:25:34,564 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 7.125) internal successors, (57), 8 states have internal predecessors, (57), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) Word has length 274 [2022-04-06 17:25:34,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:34,567 INFO L225 Difference]: With dead ends: 981 [2022-04-06 17:25:34,567 INFO L226 Difference]: Without dead ends: 789 [2022-04-06 17:25:34,568 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 534 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-04-06 17:25:34,568 INFO L913 BasicCegarLoop]: 110 mSDtfsCounter, 4 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 484 SdHoareTripleChecker+Invalid, 324 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:34,569 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 484 Invalid, 324 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:25:34,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 789 states. [2022-04-06 17:25:34,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 789 to 789. [2022-04-06 17:25:34,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 789 states, 533 states have (on average 1.0825515947467168) internal successors, (577), 549 states have internal predecessors, (577), 156 states have call successors, (156), 101 states have call predecessors, (156), 99 states have return successors, (153), 138 states have call predecessors, (153), 153 states have call successors, (153) [2022-04-06 17:25:34,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 789 states to 789 states and 886 transitions. [2022-04-06 17:25:34,673 INFO L78 Accepts]: Start accepts. Automaton has 789 states and 886 transitions. Word has length 274 [2022-04-06 17:25:34,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:34,673 INFO L478 AbstractCegarLoop]: Abstraction has 789 states and 886 transitions. [2022-04-06 17:25:34,674 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 7.125) internal successors, (57), 8 states have internal predecessors, (57), 8 states have call successors, (35), 2 states have call predecessors, (35), 2 states have return successors, (33), 8 states have call predecessors, (33), 8 states have call successors, (33) [2022-04-06 17:25:34,674 INFO L276 IsEmpty]: Start isEmpty. Operand 789 states and 886 transitions. [2022-04-06 17:25:34,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2022-04-06 17:25:34,676 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:34,676 INFO L499 BasicCegarLoop]: trace histogram [42, 41, 41, 11, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:34,695 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:34,877 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,SelfDestructingSolverStorable41 [2022-04-06 17:25:34,877 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:34,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:34,878 INFO L85 PathProgramCache]: Analyzing trace with hash -1196997250, now seen corresponding path program 37 times [2022-04-06 17:25:34,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:34,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [564993992] [2022-04-06 17:25:34,880 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:34,880 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:34,880 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:34,880 INFO L85 PathProgramCache]: Analyzing trace with hash -1196997250, now seen corresponding path program 38 times [2022-04-06 17:25:34,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:34,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108708518] [2022-04-06 17:25:34,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:34,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:34,890 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:34,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [216713547] [2022-04-06 17:25:34,891 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:25:34,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:34,891 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:34,892 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) [2022-04-06 17:25:34,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-04-06 17:25:34,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:25:34,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:25:34,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 660 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 17:25:34,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:25:35,570 INFO L134 CoverageAnalysis]: Checked inductivity of 3778 backedges. 82 proven. 3572 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-04-06 17:25:35,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:25:36,058 INFO L134 CoverageAnalysis]: Checked inductivity of 3778 backedges. 82 proven. 416 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2022-04-06 17:25:36,058 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:25:36,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108708518] [2022-04-06 17:25:36,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:25:36,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216713547] [2022-04-06 17:25:36,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216713547] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:25:36,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:25:36,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 24 [2022-04-06 17:25:36,059 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:25:36,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [564993992] [2022-04-06 17:25:36,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [564993992] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:25:36,059 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:25:36,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 17:25:36,059 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206786186] [2022-04-06 17:25:36,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:25:36,060 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 17:25:36,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:36,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 17:25:36,060 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:25:36,061 INFO L87 Difference]: Start difference. First operand 789 states and 886 transitions. Second operand has 21 states, 21 states have (on average 5.714285714285714) internal successors, (120), 20 states have internal predecessors, (120), 20 states have call successors, (44), 20 states have call predecessors, (44), 18 states have return successors, (42), 18 states have call predecessors, (42), 18 states have call successors, (42) [2022-04-06 17:25:36,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:25:36,593 INFO L93 Difference]: Finished difference Result 883 states and 998 transitions. [2022-04-06 17:25:36,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-04-06 17:25:36,594 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 5.714285714285714) internal successors, (120), 20 states have internal predecessors, (120), 20 states have call successors, (44), 20 states have call predecessors, (44), 18 states have return successors, (42), 18 states have call predecessors, (42), 18 states have call successors, (42) Word has length 278 [2022-04-06 17:25:36,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:25:36,598 INFO L225 Difference]: With dead ends: 883 [2022-04-06 17:25:36,598 INFO L226 Difference]: Without dead ends: 860 [2022-04-06 17:25:36,599 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 532 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2022-04-06 17:25:36,600 INFO L913 BasicCegarLoop]: 103 mSDtfsCounter, 178 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 535 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:25:36,600 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 396 Invalid, 535 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:25:36,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2022-04-06 17:25:36,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 859. [2022-04-06 17:25:36,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 859 states, 580 states have (on average 1.0827586206896551) internal successors, (628), 598 states have internal predecessors, (628), 171 states have call successors, (171), 109 states have call predecessors, (171), 107 states have return successors, (168), 151 states have call predecessors, (168), 168 states have call successors, (168) [2022-04-06 17:25:36,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 859 states to 859 states and 967 transitions. [2022-04-06 17:25:36,730 INFO L78 Accepts]: Start accepts. Automaton has 859 states and 967 transitions. Word has length 278 [2022-04-06 17:25:36,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:25:36,732 INFO L478 AbstractCegarLoop]: Abstraction has 859 states and 967 transitions. [2022-04-06 17:25:36,733 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 5.714285714285714) internal successors, (120), 20 states have internal predecessors, (120), 20 states have call successors, (44), 20 states have call predecessors, (44), 18 states have return successors, (42), 18 states have call predecessors, (42), 18 states have call successors, (42) [2022-04-06 17:25:36,733 INFO L276 IsEmpty]: Start isEmpty. Operand 859 states and 967 transitions. [2022-04-06 17:25:36,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2022-04-06 17:25:36,736 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:25:36,736 INFO L499 BasicCegarLoop]: trace histogram [44, 43, 43, 12, 11, 11, 11, 11, 11, 11, 11, 7, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:25:36,763 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-04-06 17:25:36,953 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2022-04-06 17:25:36,953 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:25:36,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:25:36,953 INFO L85 PathProgramCache]: Analyzing trace with hash 1719364266, now seen corresponding path program 39 times [2022-04-06 17:25:36,954 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:25:36,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [322153735] [2022-04-06 17:25:36,958 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:25:36,958 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:25:36,958 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:25:36,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1719364266, now seen corresponding path program 40 times [2022-04-06 17:25:36,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:25:36,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099520964] [2022-04-06 17:25:36,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:25:36,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:25:36,967 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:25:36,967 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [93721640] [2022-04-06 17:25:36,967 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:25:36,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:25:36,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:25:36,973 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) [2022-04-06 17:25:36,975 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-04-06 17:26:27,715 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:26:27,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:26:27,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 693 conjuncts, 41 conjunts are in the unsatisfiable core [2022-04-06 17:26:27,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:26:28,283 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 86 proven. 3962 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2022-04-06 17:26:28,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:26:28,737 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 86 proven. 478 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2022-04-06 17:26:28,737 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:26:28,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099520964] [2022-04-06 17:26:28,737 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:26:28,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93721640] [2022-04-06 17:26:28,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93721640] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:26:28,737 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:26:28,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 24 [2022-04-06 17:26:28,738 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:26:28,738 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [322153735] [2022-04-06 17:26:28,738 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [322153735] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:26:28,738 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:26:28,738 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-04-06 17:26:28,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864270483] [2022-04-06 17:26:28,738 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:26:28,738 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-04-06 17:26:28,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:28,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-04-06 17:26:28,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=316, Unknown=0, NotChecked=0, Total=552 [2022-04-06 17:26:28,739 INFO L87 Difference]: Start difference. First operand 859 states and 967 transitions. Second operand has 22 states, 22 states have (on average 5.7727272727272725) internal successors, (127), 21 states have internal predecessors, (127), 21 states have call successors, (46), 21 states have call predecessors, (46), 19 states have return successors, (44), 19 states have call predecessors, (44), 19 states have call successors, (44) [2022-04-06 17:26:29,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:26:29,296 INFO L93 Difference]: Finished difference Result 953 states and 1079 transitions. [2022-04-06 17:26:29,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-04-06 17:26:29,297 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.7727272727272725) internal successors, (127), 21 states have internal predecessors, (127), 21 states have call successors, (46), 21 states have call predecessors, (46), 19 states have return successors, (44), 19 states have call predecessors, (44), 19 states have call successors, (44) Word has length 292 [2022-04-06 17:26:29,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:26:29,301 INFO L225 Difference]: With dead ends: 953 [2022-04-06 17:26:29,301 INFO L226 Difference]: Without dead ends: 930 [2022-04-06 17:26:29,302 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 560 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=412, Invalid=778, Unknown=0, NotChecked=0, Total=1190 [2022-04-06 17:26:29,303 INFO L913 BasicCegarLoop]: 108 mSDtfsCounter, 189 mSDsluCounter, 359 mSDsCounter, 0 mSdLazyCounter, 504 mSolverCounterSat, 244 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 189 SdHoareTripleChecker+Valid, 467 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 244 IncrementalHoareTripleChecker+Valid, 504 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:26:29,303 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [189 Valid, 467 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [244 Valid, 504 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:26:29,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 930 states. [2022-04-06 17:26:29,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 930 to 929. [2022-04-06 17:26:29,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 929 states, 627 states have (on average 1.0829346092503986) internal successors, (679), 647 states have internal predecessors, (679), 186 states have call successors, (186), 117 states have call predecessors, (186), 115 states have return successors, (183), 164 states have call predecessors, (183), 183 states have call successors, (183) [2022-04-06 17:26:29,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 929 states to 929 states and 1048 transitions. [2022-04-06 17:26:29,444 INFO L78 Accepts]: Start accepts. Automaton has 929 states and 1048 transitions. Word has length 292 [2022-04-06 17:26:29,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:26:29,444 INFO L478 AbstractCegarLoop]: Abstraction has 929 states and 1048 transitions. [2022-04-06 17:26:29,444 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.7727272727272725) internal successors, (127), 21 states have internal predecessors, (127), 21 states have call successors, (46), 21 states have call predecessors, (46), 19 states have return successors, (44), 19 states have call predecessors, (44), 19 states have call successors, (44) [2022-04-06 17:26:29,444 INFO L276 IsEmpty]: Start isEmpty. Operand 929 states and 1048 transitions. [2022-04-06 17:26:29,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2022-04-06 17:26:29,447 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:26:29,447 INFO L499 BasicCegarLoop]: trace histogram [46, 45, 45, 13, 12, 12, 12, 12, 12, 12, 12, 7, 7, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:26:29,471 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-04-06 17:26:29,671 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,SelfDestructingSolverStorable43 [2022-04-06 17:26:29,672 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:26:29,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:26:29,672 INFO L85 PathProgramCache]: Analyzing trace with hash 2036404950, now seen corresponding path program 41 times [2022-04-06 17:26:29,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:29,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [584143815] [2022-04-06 17:26:29,674 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:26:29,674 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:26:29,674 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:26:29,675 INFO L85 PathProgramCache]: Analyzing trace with hash 2036404950, now seen corresponding path program 42 times [2022-04-06 17:26:29,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:26:29,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1777307011] [2022-04-06 17:26:29,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:26:29,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:26:29,683 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:26:29,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1338839281] [2022-04-06 17:26:29,684 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:26:29,684 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:29,684 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:26:29,685 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) [2022-04-06 17:26:29,687 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-04-06 17:26:30,023 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-04-06 17:26:30,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:26:30,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 669 conjuncts, 60 conjunts are in the unsatisfiable core [2022-04-06 17:26:30,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:26:30,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4596 backedges. 1767 proven. 276 refuted. 0 times theorem prover too weak. 2553 trivial. 0 not checked. [2022-04-06 17:26:30,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:26:33,409 INFO L134 CoverageAnalysis]: Checked inductivity of 4596 backedges. 387 proven. 306 refuted. 0 times theorem prover too weak. 3903 trivial. 0 not checked. [2022-04-06 17:26:33,409 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:26:33,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1777307011] [2022-04-06 17:26:33,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:26:33,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338839281] [2022-04-06 17:26:33,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1338839281] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:26:33,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:26:33,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2022-04-06 17:26:33,410 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:26:33,410 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [584143815] [2022-04-06 17:26:33,410 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [584143815] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:26:33,411 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:26:33,411 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-04-06 17:26:33,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275589432] [2022-04-06 17:26:33,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:26:33,411 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-04-06 17:26:33,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:33,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-04-06 17:26:33,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=777, Unknown=0, NotChecked=0, Total=870 [2022-04-06 17:26:33,412 INFO L87 Difference]: Start difference. First operand 929 states and 1048 transitions. Second operand has 17 states, 17 states have (on average 3.9411764705882355) internal successors, (67), 16 states have internal predecessors, (67), 14 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 15 states have call predecessors, (38), 14 states have call successors, (38) [2022-04-06 17:26:34,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:26:34,113 INFO L93 Difference]: Finished difference Result 1091 states and 1252 transitions. [2022-04-06 17:26:34,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 17:26:34,113 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.9411764705882355) internal successors, (67), 16 states have internal predecessors, (67), 14 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 15 states have call predecessors, (38), 14 states have call successors, (38) Word has length 306 [2022-04-06 17:26:34,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:26:34,117 INFO L225 Difference]: With dead ends: 1091 [2022-04-06 17:26:34,117 INFO L226 Difference]: Without dead ends: 877 [2022-04-06 17:26:34,118 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 582 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=832, Unknown=0, NotChecked=0, Total=930 [2022-04-06 17:26:34,119 INFO L913 BasicCegarLoop]: 76 mSDtfsCounter, 43 mSDsluCounter, 559 mSDsCounter, 0 mSdLazyCounter, 1115 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 1115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 17:26:34,119 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 635 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 1115 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 17:26:34,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 877 states. [2022-04-06 17:26:34,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 877 to 877. [2022-04-06 17:26:34,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 877 states, 592 states have (on average 1.0810810810810811) internal successors, (640), 610 states have internal predecessors, (640), 174 states have call successors, (174), 112 states have call predecessors, (174), 110 states have return successors, (171), 154 states have call predecessors, (171), 171 states have call successors, (171) [2022-04-06 17:26:34,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 877 states to 877 states and 985 transitions. [2022-04-06 17:26:34,230 INFO L78 Accepts]: Start accepts. Automaton has 877 states and 985 transitions. Word has length 306 [2022-04-06 17:26:34,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:26:34,230 INFO L478 AbstractCegarLoop]: Abstraction has 877 states and 985 transitions. [2022-04-06 17:26:34,230 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.9411764705882355) internal successors, (67), 16 states have internal predecessors, (67), 14 states have call successors, (40), 2 states have call predecessors, (40), 3 states have return successors, (38), 15 states have call predecessors, (38), 14 states have call successors, (38) [2022-04-06 17:26:34,230 INFO L276 IsEmpty]: Start isEmpty. Operand 877 states and 985 transitions. [2022-04-06 17:26:34,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2022-04-06 17:26:34,234 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:26:34,234 INFO L499 BasicCegarLoop]: trace histogram [47, 46, 46, 12, 11, 11, 11, 11, 11, 11, 11, 8, 8, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:26:34,243 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-04-06 17:26:34,441 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:34,442 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:26:34,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:26:34,442 INFO L85 PathProgramCache]: Analyzing trace with hash 249588560, now seen corresponding path program 43 times [2022-04-06 17:26:34,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:34,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1576850899] [2022-04-06 17:26:34,445 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:26:34,445 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:26:34,445 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:26:34,445 INFO L85 PathProgramCache]: Analyzing trace with hash 249588560, now seen corresponding path program 44 times [2022-04-06 17:26:34,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:26:34,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712307333] [2022-04-06 17:26:34,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:26:34,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:26:34,455 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:26:34,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1144027766] [2022-04-06 17:26:34,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:26:34,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:34,456 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:26:34,456 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) [2022-04-06 17:26:34,484 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-04-06 17:26:34,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:26:34,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:26:34,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 43 conjunts are in the unsatisfiable core [2022-04-06 17:26:34,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:26:35,247 INFO L134 CoverageAnalysis]: Checked inductivity of 4752 backedges. 92 proven. 4520 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-04-06 17:26:35,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:26:35,764 INFO L134 CoverageAnalysis]: Checked inductivity of 4752 backedges. 92 proven. 520 refuted. 0 times theorem prover too weak. 4140 trivial. 0 not checked. [2022-04-06 17:26:35,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:26:35,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712307333] [2022-04-06 17:26:35,765 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:26:35,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144027766] [2022-04-06 17:26:35,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144027766] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:26:35,765 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:26:35,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 23 [2022-04-06 17:26:35,765 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:26:35,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1576850899] [2022-04-06 17:26:35,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1576850899] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:26:35,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:26:35,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-04-06 17:26:35,766 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251368681] [2022-04-06 17:26:35,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:26:35,766 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-04-06 17:26:35,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:35,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-04-06 17:26:35,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2022-04-06 17:26:35,767 INFO L87 Difference]: Start difference. First operand 877 states and 985 transitions. Second operand has 23 states, 23 states have (on average 5.782608695652174) internal successors, (133), 22 states have internal predecessors, (133), 22 states have call successors, (49), 22 states have call predecessors, (49), 20 states have return successors, (47), 20 states have call predecessors, (47), 20 states have call successors, (47) [2022-04-06 17:26:36,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:26:36,338 INFO L93 Difference]: Finished difference Result 971 states and 1097 transitions. [2022-04-06 17:26:36,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-04-06 17:26:36,339 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 5.782608695652174) internal successors, (133), 22 states have internal predecessors, (133), 22 states have call successors, (49), 22 states have call predecessors, (49), 20 states have return successors, (47), 20 states have call predecessors, (47), 20 states have call successors, (47) Word has length 310 [2022-04-06 17:26:36,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:26:36,343 INFO L225 Difference]: With dead ends: 971 [2022-04-06 17:26:36,343 INFO L226 Difference]: Without dead ends: 948 [2022-04-06 17:26:36,343 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 597 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=387, Invalid=735, Unknown=0, NotChecked=0, Total=1122 [2022-04-06 17:26:36,344 INFO L913 BasicCegarLoop]: 111 mSDtfsCounter, 177 mSDsluCounter, 335 mSDsCounter, 0 mSdLazyCounter, 431 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 431 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:26:36,344 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 446 Invalid, 626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 431 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:26:36,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 948 states. [2022-04-06 17:26:36,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 948 to 947. [2022-04-06 17:26:36,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 947 states, 639 states have (on average 1.081377151799687) internal successors, (691), 659 states have internal predecessors, (691), 189 states have call successors, (189), 120 states have call predecessors, (189), 118 states have return successors, (186), 167 states have call predecessors, (186), 186 states have call successors, (186) [2022-04-06 17:26:36,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 947 states to 947 states and 1066 transitions. [2022-04-06 17:26:36,478 INFO L78 Accepts]: Start accepts. Automaton has 947 states and 1066 transitions. Word has length 310 [2022-04-06 17:26:36,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:26:36,478 INFO L478 AbstractCegarLoop]: Abstraction has 947 states and 1066 transitions. [2022-04-06 17:26:36,478 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 5.782608695652174) internal successors, (133), 22 states have internal predecessors, (133), 22 states have call successors, (49), 22 states have call predecessors, (49), 20 states have return successors, (47), 20 states have call predecessors, (47), 20 states have call successors, (47) [2022-04-06 17:26:36,479 INFO L276 IsEmpty]: Start isEmpty. Operand 947 states and 1066 transitions. [2022-04-06 17:26:36,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2022-04-06 17:26:36,481 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:26:36,482 INFO L499 BasicCegarLoop]: trace histogram [49, 48, 48, 13, 12, 12, 12, 12, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:26:36,514 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-04-06 17:26:36,695 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:36,695 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:26:36,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:26:36,696 INFO L85 PathProgramCache]: Analyzing trace with hash 1363998972, now seen corresponding path program 45 times [2022-04-06 17:26:36,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:36,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [688588479] [2022-04-06 17:26:36,699 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:26:36,699 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:26:36,700 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:26:36,700 INFO L85 PathProgramCache]: Analyzing trace with hash 1363998972, now seen corresponding path program 46 times [2022-04-06 17:26:36,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:26:36,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3353916] [2022-04-06 17:26:36,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:26:36,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:26:36,707 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:26:36,707 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1891404233] [2022-04-06 17:26:36,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:26:36,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:36,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:26:36,708 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) [2022-04-06 17:26:36,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-04-06 17:26:37,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:26:37,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:26:37,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 17:26:37,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:26:38,271 INFO L134 CoverageAnalysis]: Checked inductivity of 5196 backedges. 1571 proven. 329 refuted. 0 times theorem prover too weak. 3296 trivial. 0 not checked. [2022-04-06 17:26:38,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:26:39,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5196 backedges. 313 proven. 323 refuted. 0 times theorem prover too weak. 4560 trivial. 0 not checked. [2022-04-06 17:26:39,997 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:26:39,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3353916] [2022-04-06 17:26:39,997 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:26:39,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891404233] [2022-04-06 17:26:39,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891404233] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:26:39,998 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:26:39,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2022-04-06 17:26:39,998 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:26:39,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [688588479] [2022-04-06 17:26:39,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [688588479] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:26:39,998 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:26:39,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 17:26:39,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485251046] [2022-04-06 17:26:39,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:26:39,999 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 17:26:39,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:39,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 17:26:39,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-04-06 17:26:39,999 INFO L87 Difference]: Start difference. First operand 947 states and 1066 transitions. Second operand has 10 states, 10 states have (on average 7.1) internal successors, (71), 10 states have internal predecessors, (71), 10 states have call successors, (45), 2 states have call predecessors, (45), 2 states have return successors, (43), 10 states have call predecessors, (43), 10 states have call successors, (43) [2022-04-06 17:26:40,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:26:40,406 INFO L93 Difference]: Finished difference Result 1091 states and 1254 transitions. [2022-04-06 17:26:40,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 17:26:40,407 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.1) internal successors, (71), 10 states have internal predecessors, (71), 10 states have call successors, (45), 2 states have call predecessors, (45), 2 states have return successors, (43), 10 states have call predecessors, (43), 10 states have call successors, (43) Word has length 324 [2022-04-06 17:26:40,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:26:40,412 INFO L225 Difference]: With dead ends: 1091 [2022-04-06 17:26:40,412 INFO L226 Difference]: Without dead ends: 895 [2022-04-06 17:26:40,413 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 647 GetRequests, 630 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-04-06 17:26:40,413 INFO L913 BasicCegarLoop]: 140 mSDtfsCounter, 6 mSDsluCounter, 626 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 766 SdHoareTripleChecker+Invalid, 592 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:26:40,413 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 766 Invalid, 592 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:26:40,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2022-04-06 17:26:40,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 895. [2022-04-06 17:26:40,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 895 states, 604 states have (on average 1.0794701986754967) internal successors, (652), 622 states have internal predecessors, (652), 177 states have call successors, (177), 115 states have call predecessors, (177), 113 states have return successors, (174), 157 states have call predecessors, (174), 174 states have call successors, (174) [2022-04-06 17:26:40,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 895 states to 895 states and 1003 transitions. [2022-04-06 17:26:40,543 INFO L78 Accepts]: Start accepts. Automaton has 895 states and 1003 transitions. Word has length 324 [2022-04-06 17:26:40,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:26:40,543 INFO L478 AbstractCegarLoop]: Abstraction has 895 states and 1003 transitions. [2022-04-06 17:26:40,543 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 7.1) internal successors, (71), 10 states have internal predecessors, (71), 10 states have call successors, (45), 2 states have call predecessors, (45), 2 states have return successors, (43), 10 states have call predecessors, (43), 10 states have call successors, (43) [2022-04-06 17:26:40,543 INFO L276 IsEmpty]: Start isEmpty. Operand 895 states and 1003 transitions. [2022-04-06 17:26:40,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2022-04-06 17:26:40,546 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:26:40,546 INFO L499 BasicCegarLoop]: trace histogram [50, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 9, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:26:40,555 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-04-06 17:26:40,755 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,SelfDestructingSolverStorable46 [2022-04-06 17:26:40,755 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:26:40,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:26:40,756 INFO L85 PathProgramCache]: Analyzing trace with hash -1535062410, now seen corresponding path program 47 times [2022-04-06 17:26:40,756 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:26:40,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [736148842] [2022-04-06 17:26:40,760 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 3 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 17:26:40,761 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 17:26:40,761 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 17:26:40,761 INFO L85 PathProgramCache]: Analyzing trace with hash -1535062410, now seen corresponding path program 48 times [2022-04-06 17:26:40,761 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:26:40,761 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145113522] [2022-04-06 17:26:40,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:26:40,761 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:26:40,771 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:26:40,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [763961725] [2022-04-06 17:26:40,771 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:26:40,771 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:26:40,771 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:26:40,772 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) [2022-04-06 17:26:40,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-04-06 17:26:41,169 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2022-04-06 17:26:41,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:26:41,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 767 conjuncts, 115 conjunts are in the unsatisfiable core [2022-04-06 17:26:41,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:26:42,771 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1317 proven. 541 refuted. 0 times theorem prover too weak. 3512 trivial. 0 not checked. [2022-04-06 17:26:42,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:27:04,961 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:27:44,332 WARN L232 SmtUtils]: Spent 18.84s on a formula simplification that was a NOOP. DAG size: 165 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:29:04,023 WARN L232 SmtUtils]: Spent 48.81s on a formula simplification. DAG size of input: 117 DAG size of output: 105 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)