/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/hard-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 17:02:37,049 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 17:02:37,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 17:02:37,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 17:02:37,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 17:02:37,128 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 17:02:37,135 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 17:02:37,135 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 17:02:37,143 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 17:02:37,143 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 17:02:37,150 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 17:02:37,150 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 17:02:37,150 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 17:02:37,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 17:02:37,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 17:02:37,150 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 17:02:37,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 17:02:37,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 17:02:37,152 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 17:02:37,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 17:02:37,152 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 17:02:37,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 17:02:37,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 17:02:37,153 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 17:02:37,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 17:02:37,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 17:02:37,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:02:37,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 17:02:37,153 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 17:02:37,154 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 17:02:37,154 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 17:02:37,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 17:02:37,154 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 17:02:37,154 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 17:02:37,376 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 17:02:37,392 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 17:02:37,394 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 17:02:37,395 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 17:02:37,396 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 17:02:37,397 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound20.c [2022-04-06 17:02:37,467 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/827c8ba70/95d57d147c454c479785ff6b6b82ecc2/FLAG05884e1e9 [2022-04-06 17:02:37,820 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 17:02:37,820 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound20.c [2022-04-06 17:02:37,829 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/827c8ba70/95d57d147c454c479785ff6b6b82ecc2/FLAG05884e1e9 [2022-04-06 17:02:37,837 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/827c8ba70/95d57d147c454c479785ff6b6b82ecc2 [2022-04-06 17:02:37,839 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 17:02:37,840 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 17:02:37,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 17:02:37,841 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 17:02:37,844 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 17:02:37,844 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:02:37" (1/1) ... [2022-04-06 17:02:37,845 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ca3c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:37, skipping insertion in model container [2022-04-06 17:02:37,845 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:02:37" (1/1) ... [2022-04-06 17:02:37,850 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 17:02:37,861 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 17:02:37,990 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/hard-ll_valuebound20.c[538,551] [2022-04-06 17:02:38,009 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:02:38,018 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 17:02:38,029 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/hard-ll_valuebound20.c[538,551] [2022-04-06 17:02:38,047 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:02:38,058 INFO L208 MainTranslator]: Completed translation [2022-04-06 17:02:38,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38 WrapperNode [2022-04-06 17:02:38,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 17:02:38,062 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 17:02:38,062 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 17:02:38,062 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 17:02:38,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,072 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,077 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,078 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,090 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,092 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,095 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 17:02:38,095 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 17:02:38,095 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 17:02:38,096 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 17:02:38,096 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (1/1) ... [2022-04-06 17:02:38,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:02:38,109 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:38,118 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 17:02:38,119 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 17:02:38,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 17:02:38,152 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 17:02:38,152 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 17:02:38,153 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 17:02:38,153 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 17:02:38,153 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 17:02:38,153 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 17:02:38,153 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 17:02:38,153 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 17:02:38,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 17:02:38,154 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-06 17:02:38,154 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 17:02:38,155 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 17:02:38,156 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 17:02:38,204 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 17:02:38,205 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 17:02:38,293 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 17:02:38,298 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 17:02:38,298 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 17:02:38,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:02:38 BoogieIcfgContainer [2022-04-06 17:02:38,299 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 17:02:38,301 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 17:02:38,301 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 17:02:38,310 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 17:02:38,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 05:02:37" (1/3) ... [2022-04-06 17:02:38,310 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2584ee25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:02:38, skipping insertion in model container [2022-04-06 17:02:38,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:02:38" (2/3) ... [2022-04-06 17:02:38,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2584ee25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:02:38, skipping insertion in model container [2022-04-06 17:02:38,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:02:38" (3/3) ... [2022-04-06 17:02:38,312 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound20.c [2022-04-06 17:02:38,316 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 17:02:38,316 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 17:02:38,343 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 17:02:38,348 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 17:02:38,348 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 17:02:38,364 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 17:02:38,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 17:02:38,371 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:38,371 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:02:38,372 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:38,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:38,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 1 times [2022-04-06 17:02:38,382 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:38,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1620921881] [2022-04-06 17:02:38,392 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:38,392 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 2 times [2022-04-06 17:02:38,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:38,394 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279011699] [2022-04-06 17:02:38,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:38,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:38,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:38,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:02:38,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:38,600 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:02:38,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:38,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:02:38,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:38,629 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:02:38,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:38,652 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:02:38,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:38,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279011699] [2022-04-06 17:02:38,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279011699] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:38,654 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:38,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:02:38,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:38,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1620921881] [2022-04-06 17:02:38,657 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1620921881] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:38,657 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:38,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:02:38,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851990536] [2022-04-06 17:02:38,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:38,661 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 17:02:38,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:38,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 17:02:38,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 17:02:38,697 INFO L87 Difference]: Start difference. First operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 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 17:02:38,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:38,817 INFO L93 Difference]: Finished difference Result 69 states and 110 transitions. [2022-04-06 17:02:38,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 17:02:38,820 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 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 28 [2022-04-06 17:02:38,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:38,828 INFO L225 Difference]: With dead ends: 69 [2022-04-06 17:02:38,828 INFO L226 Difference]: Without dead ends: 33 [2022-04-06 17:02:38,831 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 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 17:02:38,838 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:38,840 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:38,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-06 17:02:38,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-04-06 17:02:38,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:02:38,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-04-06 17:02:38,882 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 28 [2022-04-06 17:02:38,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:38,882 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-04-06 17:02:38,883 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 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 17:02:38,883 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-04-06 17:02:38,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 17:02:38,884 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:38,884 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:02:38,885 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 17:02:38,885 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:38,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:38,886 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 1 times [2022-04-06 17:02:38,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:38,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [758026656] [2022-04-06 17:02:38,887 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:38,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 2 times [2022-04-06 17:02:38,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:38,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487463046] [2022-04-06 17:02:38,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:38,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:38,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:02:39,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:02:39,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:02:39,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,046 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:02:39,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,051 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:02:39,051 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:39,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487463046] [2022-04-06 17:02:39,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487463046] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:02:39,052 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:39,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [758026656] [2022-04-06 17:02:39,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [758026656] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,053 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:02:39,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228789599] [2022-04-06 17:02:39,053 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:39,054 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:02:39,054 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:39,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:02:39,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:02:39,055 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 17:02:39,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:39,221 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-04-06 17:02:39,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:02:39,221 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-04-06 17:02:39,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:39,223 INFO L225 Difference]: With dead ends: 46 [2022-04-06 17:02:39,223 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 17:02:39,223 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 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 17:02:39,224 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:39,225 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 48 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:39,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 17:02:39,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-04-06 17:02:39,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:02:39,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2022-04-06 17:02:39,237 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 28 [2022-04-06 17:02:39,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:39,238 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2022-04-06 17:02:39,238 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 17:02:39,238 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2022-04-06 17:02:39,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-04-06 17:02:39,239 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:39,239 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 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 17:02:39,239 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 17:02:39,239 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:39,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:39,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 1 times [2022-04-06 17:02:39,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:39,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [636267557] [2022-04-06 17:02:39,241 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:39,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 2 times [2022-04-06 17:02:39,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:39,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339997895] [2022-04-06 17:02:39,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:39,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:39,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,303 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:02:39,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:02:39,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,313 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:02:39,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,316 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:02:39,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-04-06 17:02:39,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:02:39,326 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:02:39,326 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:39,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339997895] [2022-04-06 17:02:39,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1339997895] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:02:39,327 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:39,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [636267557] [2022-04-06 17:02:39,327 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [636267557] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,327 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,327 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:02:39,328 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933331946] [2022-04-06 17:02:39,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:39,328 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:02:39,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:39,329 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:02:39,329 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:02:39,329 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 17:02:39,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:39,527 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2022-04-06 17:02:39,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:02:39,527 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2022-04-06 17:02:39,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:39,530 INFO L225 Difference]: With dead ends: 50 [2022-04-06 17:02:39,531 INFO L226 Difference]: Without dead ends: 48 [2022-04-06 17:02:39,531 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 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 17:02:39,533 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 33 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:39,543 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 48 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:39,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-04-06 17:02:39,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-04-06 17:02:39,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:02:39,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-04-06 17:02:39,554 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-04-06 17:02:39,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:39,554 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-04-06 17:02:39,554 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 17:02:39,554 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-04-06 17:02:39,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-04-06 17:02:39,555 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:39,555 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 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 17:02:39,556 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 17:02:39,556 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:39,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:39,556 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 1 times [2022-04-06 17:02:39,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:39,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [844862015] [2022-04-06 17:02:39,557 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:39,557 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 2 times [2022-04-06 17:02:39,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:39,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540430748] [2022-04-06 17:02:39,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:39,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:39,581 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:39,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [243158216] [2022-04-06 17:02:39,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:39,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:39,582 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:39,587 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 17:02:39,603 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 17:02:39,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:39,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:39,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:02:39,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:39,836 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 17:02:39,836 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:02:39,837 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:39,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540430748] [2022-04-06 17:02:39,837 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:39,837 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243158216] [2022-04-06 17:02:39,837 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243158216] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,837 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:02:39,838 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:39,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [844862015] [2022-04-06 17:02:39,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [844862015] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:39,839 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:39,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:02:39,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460896938] [2022-04-06 17:02:39,839 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:39,839 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:02:39,840 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:39,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:02:39,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:02:39,840 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:02:39,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:39,924 INFO L93 Difference]: Finished difference Result 69 states and 89 transitions. [2022-04-06 17:02:39,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:02:39,925 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 38 [2022-04-06 17:02:39,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:39,926 INFO L225 Difference]: With dead ends: 69 [2022-04-06 17:02:39,926 INFO L226 Difference]: Without dead ends: 55 [2022-04-06 17:02:39,926 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 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 17:02:39,928 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 8 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:39,928 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 145 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:39,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-04-06 17:02:39,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-04-06 17:02:39,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-04-06 17:02:39,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2022-04-06 17:02:39,954 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 38 [2022-04-06 17:02:39,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:39,955 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2022-04-06 17:02:39,955 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:02:39,955 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2022-04-06 17:02:39,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-06 17:02:39,956 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:39,956 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 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 17:02:39,982 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 17:02:40,175 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:40,175 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:40,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:40,176 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 1 times [2022-04-06 17:02:40,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:40,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1929768112] [2022-04-06 17:02:40,177 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:40,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 2 times [2022-04-06 17:02:40,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:40,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691813607] [2022-04-06 17:02:40,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:40,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:40,192 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:40,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [386742898] [2022-04-06 17:02:40,193 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:40,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:40,193 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:40,194 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 17:02:40,207 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 17:02:40,263 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:40,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:40,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2022-04-06 17:02:40,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:40,614 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-04-06 17:02:40,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:02:40,801 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 17:02:40,802 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:40,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691813607] [2022-04-06 17:02:40,802 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:40,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386742898] [2022-04-06 17:02:40,802 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386742898] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 17:02:40,802 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:02:40,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-04-06 17:02:40,803 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:40,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1929768112] [2022-04-06 17:02:40,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1929768112] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:40,803 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:40,803 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:02:40,803 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700805125] [2022-04-06 17:02:40,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:40,804 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:02:40,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:40,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:02:40,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:02:40,805 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:02:40,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:40,889 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-04-06 17:02:40,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:02:40,889 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 45 [2022-04-06 17:02:40,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:40,890 INFO L225 Difference]: With dead ends: 68 [2022-04-06 17:02:40,890 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 17:02:40,891 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:02:40,892 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 12 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:40,892 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 151 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:40,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 17:02:40,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-04-06 17:02:40,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 38 states have internal predecessors, (43), 20 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-04-06 17:02:40,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2022-04-06 17:02:40,905 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 45 [2022-04-06 17:02:40,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:40,905 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2022-04-06 17:02:40,905 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:02:40,906 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2022-04-06 17:02:40,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 17:02:40,907 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:40,908 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:02:40,959 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 17:02:41,123 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:41,123 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:41,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:41,124 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 1 times [2022-04-06 17:02:41,124 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:41,124 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1644698558] [2022-04-06 17:02:41,124 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:41,125 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 2 times [2022-04-06 17:02:41,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:41,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142733764] [2022-04-06 17:02:41,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:41,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:41,133 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:41,133 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [250722586] [2022-04-06 17:02:41,133 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:41,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:41,134 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:41,134 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 17:02:41,155 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 17:02:41,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:41,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:41,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 18 conjunts are in the unsatisfiable core [2022-04-06 17:02:41,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:41,446 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-04-06 17:02:41,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:02:41,582 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-04-06 17:02:41,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:41,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142733764] [2022-04-06 17:02:41,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:41,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250722586] [2022-04-06 17:02:41,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250722586] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 17:02:41,584 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:02:41,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2022-04-06 17:02:41,584 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:41,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1644698558] [2022-04-06 17:02:41,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1644698558] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:41,585 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:41,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:02:41,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986972075] [2022-04-06 17:02:41,585 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:41,585 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:02:41,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:41,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:02:41,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:02:41,586 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:02:41,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:41,645 INFO L93 Difference]: Finished difference Result 76 states and 95 transitions. [2022-04-06 17:02:41,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:02:41,645 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 55 [2022-04-06 17:02:41,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:41,647 INFO L225 Difference]: With dead ends: 76 [2022-04-06 17:02:41,647 INFO L226 Difference]: Without dead ends: 74 [2022-04-06 17:02:41,647 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:02:41,652 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 8 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:41,653 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 129 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:02:41,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-04-06 17:02:41,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-04-06 17:02:41,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.175) internal successors, (47), 43 states have internal predecessors, (47), 22 states have call successors, (22), 9 states have call predecessors, (22), 8 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-04-06 17:02:41,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2022-04-06 17:02:41,666 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 55 [2022-04-06 17:02:41,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:41,667 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2022-04-06 17:02:41,667 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:02:41,667 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2022-04-06 17:02:41,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 17:02:41,668 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:41,668 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 17:02:41,687 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 17:02:41,879 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:41,880 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:41,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:41,880 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 1 times [2022-04-06 17:02:41,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:41,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1853333962] [2022-04-06 17:02:41,881 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:41,881 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 2 times [2022-04-06 17:02:41,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:41,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443543585] [2022-04-06 17:02:41,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:41,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:41,906 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:41,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [507531190] [2022-04-06 17:02:41,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:41,907 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:41,907 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:41,913 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 17:02:41,914 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 17:02:41,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:41,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:41,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:02:41,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:42,082 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-04-06 17:02:42,082 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:02:42,082 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:42,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443543585] [2022-04-06 17:02:42,083 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:42,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507531190] [2022-04-06 17:02:42,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507531190] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:42,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:42,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:02:42,083 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:42,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1853333962] [2022-04-06 17:02:42,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1853333962] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:42,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:42,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:02:42,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263222843] [2022-04-06 17:02:42,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:42,085 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:02:42,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:42,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:02:42,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:02:42,086 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-04-06 17:02:42,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:42,146 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2022-04-06 17:02:42,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:02:42,147 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), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2022-04-06 17:02:42,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:42,151 INFO L225 Difference]: With dead ends: 79 [2022-04-06 17:02:42,151 INFO L226 Difference]: Without dead ends: 72 [2022-04-06 17:02:42,151 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 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 17:02:42,152 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:42,152 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 123 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:02:42,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-04-06 17:02:42,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-04-06 17:02:42,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 41 states have (on average 1.146341463414634) internal successors, (47), 44 states have internal predecessors, (47), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 17:02:42,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-04-06 17:02:42,174 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 56 [2022-04-06 17:02:42,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:42,174 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-04-06 17:02:42,174 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), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-04-06 17:02:42,174 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-04-06 17:02:42,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-04-06 17:02:42,176 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:42,177 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 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, 1, 1, 1, 1] [2022-04-06 17:02:42,193 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 17:02:42,379 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:42,379 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:42,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:42,380 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 1 times [2022-04-06 17:02:42,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:42,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2047949497] [2022-04-06 17:02:42,380 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:42,381 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 2 times [2022-04-06 17:02:42,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:42,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380505707] [2022-04-06 17:02:42,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:42,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:42,390 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:42,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [237469470] [2022-04-06 17:02:42,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:42,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:42,391 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:42,391 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 17:02:42,402 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 17:02:42,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:42,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:42,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 17:02:42,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:43,124 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-04-06 17:02:43,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:02:44,439 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-04-06 17:02:44,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:44,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380505707] [2022-04-06 17:02:44,440 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:44,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237469470] [2022-04-06 17:02:44,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237469470] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:02:44,440 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:02:44,440 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-04-06 17:02:44,440 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:44,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2047949497] [2022-04-06 17:02:44,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2047949497] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:44,441 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:44,441 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:02:44,441 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883468555] [2022-04-06 17:02:44,441 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:44,441 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:02:44,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:44,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:02:44,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:02:44,442 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:02:44,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:44,686 INFO L93 Difference]: Finished difference Result 135 states and 165 transitions. [2022-04-06 17:02:44,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:02:44,686 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2022-04-06 17:02:44,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:44,688 INFO L225 Difference]: With dead ends: 135 [2022-04-06 17:02:44,688 INFO L226 Difference]: Without dead ends: 108 [2022-04-06 17:02:44,689 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-04-06 17:02:44,689 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 10 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:44,689 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 234 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:02:44,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-04-06 17:02:44,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-04-06 17:02:44,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 64 states have (on average 1.140625) internal successors, (73), 67 states have internal predecessors, (73), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 17:02:44,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2022-04-06 17:02:44,707 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 75 [2022-04-06 17:02:44,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:44,707 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2022-04-06 17:02:44,707 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:02:44,707 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2022-04-06 17:02:44,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-04-06 17:02:44,708 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:44,708 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1] [2022-04-06 17:02:44,734 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-04-06 17:02:44,934 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:44,934 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:44,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:44,935 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 3 times [2022-04-06 17:02:44,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:44,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [417850945] [2022-04-06 17:02:44,935 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:44,936 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 4 times [2022-04-06 17:02:44,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:44,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552468125] [2022-04-06 17:02:44,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:44,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:44,945 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:44,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [15012759] [2022-04-06 17:02:44,945 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:02:44,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:44,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:44,951 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 17:02:44,952 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 17:02:45,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:02:45,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:45,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 17:02:45,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:45,245 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-04-06 17:02:45,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:02:47,653 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-04-06 17:02:47,654 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:02:47,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552468125] [2022-04-06 17:02:47,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:02:47,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15012759] [2022-04-06 17:02:47,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15012759] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:02:47,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:02:47,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2022-04-06 17:02:47,655 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:02:47,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [417850945] [2022-04-06 17:02:47,655 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [417850945] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:02:47,655 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:02:47,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 17:02:47,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76953102] [2022-04-06 17:02:47,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:02:47,655 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 17:02:47,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:47,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 17:02:47,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:02:47,656 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-04-06 17:02:47,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:02:47,836 INFO L93 Difference]: Finished difference Result 133 states and 159 transitions. [2022-04-06 17:02:47,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:02:47,837 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 80 [2022-04-06 17:02:47,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:02:47,838 INFO L225 Difference]: With dead ends: 133 [2022-04-06 17:02:47,838 INFO L226 Difference]: Without dead ends: 110 [2022-04-06 17:02:47,839 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:02:47,839 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 11 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:02:47,840 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 222 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:02:47,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-04-06 17:02:47,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2022-04-06 17:02:47,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 66 states have (on average 1.106060606060606) internal successors, (73), 70 states have internal predecessors, (73), 28 states have call successors, (28), 16 states have call predecessors, (28), 15 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 17:02:47,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2022-04-06 17:02:47,854 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 80 [2022-04-06 17:02:47,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:02:47,854 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2022-04-06 17:02:47,854 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-04-06 17:02:47,854 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2022-04-06 17:02:47,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-04-06 17:02:47,855 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:02:47,855 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:02:47,881 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 17:02:48,075 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:48,076 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:02:48,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:02:48,076 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 1 times [2022-04-06 17:02:48,076 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:02:48,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [16536895] [2022-04-06 17:02:48,077 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:02:48,077 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 2 times [2022-04-06 17:02:48,077 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:02:48,077 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852966745] [2022-04-06 17:02:48,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:02:48,077 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:02:48,086 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:02:48,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2095242276] [2022-04-06 17:02:48,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:02:48,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:02:48,087 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:02:48,093 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 17:02:48,119 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 17:02:48,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:02:48,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:02:48,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 17:02:48,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:02:49,445 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-04-06 17:02:49,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:03:03,655 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-04-06 17:03:03,655 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:03,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852966745] [2022-04-06 17:03:03,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:03,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095242276] [2022-04-06 17:03:03,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095242276] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:03:03,656 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:03:03,656 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-04-06 17:03:03,656 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:03,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [16536895] [2022-04-06 17:03:03,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [16536895] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:03,656 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:03,657 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 17:03:03,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123702737] [2022-04-06 17:03:03,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:03,657 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 17:03:03,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:03,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 17:03:03,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2022-04-06 17:03:03,658 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:03:04,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:04,926 INFO L93 Difference]: Finished difference Result 116 states and 131 transitions. [2022-04-06 17:03:04,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 17:03:04,927 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 86 [2022-04-06 17:03:04,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:04,928 INFO L225 Difference]: With dead ends: 116 [2022-04-06 17:03:04,928 INFO L226 Difference]: Without dead ends: 88 [2022-04-06 17:03:04,929 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:03:04,929 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 17 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:04,930 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 230 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-04-06 17:03:04,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-04-06 17:03:04,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-04-06 17:03:04,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 55 states have internal predecessors, (58), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2022-04-06 17:03:04,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2022-04-06 17:03:04,941 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 86 [2022-04-06 17:03:04,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:04,941 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2022-04-06 17:03:04,941 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:03:04,941 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2022-04-06 17:03:04,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-04-06 17:03:04,942 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:04,942 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 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 17:03:04,964 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 17:03:05,155 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:05,156 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:05,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:05,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 5 times [2022-04-06 17:03:05,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:05,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1108219163] [2022-04-06 17:03:05,157 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:05,157 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 6 times [2022-04-06 17:03:05,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:05,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1830554646] [2022-04-06 17:03:05,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:05,157 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:05,165 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:05,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1371894520] [2022-04-06 17:03:05,165 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:03:05,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:05,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:05,168 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 17:03:05,169 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 17:03:05,218 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 17:03:05,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:05,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-06 17:03:05,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:18,111 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:03:18,890 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-04-06 17:03:18,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:04:12,671 WARN L232 SmtUtils]: Spent 30.71s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:05:20,501 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 45 proven. 19 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-04-06 17:05:20,502 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:05:20,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1830554646] [2022-04-06 17:05:20,502 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:05:20,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371894520] [2022-04-06 17:05:20,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371894520] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:05:20,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:05:20,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2022-04-06 17:05:20,503 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:05:20,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1108219163] [2022-04-06 17:05:20,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1108219163] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:05:20,503 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:05:20,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:05:20,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636133827] [2022-04-06 17:05:20,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:05:20,503 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:05:20,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:05:20,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:05:20,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=163, Unknown=1, NotChecked=0, Total=210 [2022-04-06 17:05:20,504 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:05:23,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:05:23,793 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-04-06 17:05:23,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 17:05:23,793 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 92 [2022-04-06 17:05:23,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:05:23,794 INFO L225 Difference]: With dead ends: 112 [2022-04-06 17:05:23,794 INFO L226 Difference]: Without dead ends: 100 [2022-04-06 17:05:23,795 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 39.2s TimeCoverageRelationStatistics Valid=59, Invalid=211, Unknown=2, NotChecked=0, Total=272 [2022-04-06 17:05:23,795 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 25 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-04-06 17:05:23,795 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 191 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-04-06 17:05:23,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-04-06 17:05:23,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2022-04-06 17:05:23,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 59 states have (on average 1.11864406779661) internal successors, (66), 63 states have internal predecessors, (66), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2022-04-06 17:05:23,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 116 transitions. [2022-04-06 17:05:23,807 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 116 transitions. Word has length 92 [2022-04-06 17:05:23,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:05:23,808 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 116 transitions. [2022-04-06 17:05:23,808 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:05:23,808 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 116 transitions. [2022-04-06 17:05:23,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-04-06 17:05:23,809 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:05:23,809 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:05:23,826 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 17:05:24,015 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,SelfDestructingSolverStorable10 [2022-04-06 17:05:24,016 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:05:24,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:05:24,016 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 7 times [2022-04-06 17:05:24,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:05:24,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1516641781] [2022-04-06 17:05:24,016 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:05:24,016 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 8 times [2022-04-06 17:05:24,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:05:24,017 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145476778] [2022-04-06 17:05:24,017 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:05:24,017 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:05:24,024 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:05:24,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1973561190] [2022-04-06 17:05:24,025 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:05:24,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:05:24,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:05:24,026 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 17:05:24,026 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 17:05:24,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:05:24,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:05:24,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 17:05:24,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:05:24,553 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-04-06 17:05:24,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:05:26,907 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-04-06 17:05:26,908 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:05:26,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145476778] [2022-04-06 17:05:26,908 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:05:26,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1973561190] [2022-04-06 17:05:26,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1973561190] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:05:26,908 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:05:26,908 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-04-06 17:05:26,908 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:05:26,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1516641781] [2022-04-06 17:05:26,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1516641781] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:05:26,909 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:05:26,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:05:26,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211949105] [2022-04-06 17:05:26,909 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:05:26,909 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:05:26,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:05:26,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:05:26,910 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:05:26,910 INFO L87 Difference]: Start difference. First operand 99 states and 116 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-04-06 17:05:27,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:05:27,260 INFO L93 Difference]: Finished difference Result 177 states and 223 transitions. [2022-04-06 17:05:27,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:05:27,260 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 97 [2022-04-06 17:05:27,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:05:27,261 INFO L225 Difference]: With dead ends: 177 [2022-04-06 17:05:27,261 INFO L226 Difference]: Without dead ends: 138 [2022-04-06 17:05:27,262 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-04-06 17:05:27,262 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 13 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:05:27,263 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 306 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:05:27,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-04-06 17:05:27,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-04-06 17:05:27,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 82 states have (on average 1.1219512195121952) internal successors, (92), 88 states have internal predecessors, (92), 39 states have call successors, (39), 17 states have call predecessors, (39), 16 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2022-04-06 17:05:27,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 167 transitions. [2022-04-06 17:05:27,282 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 167 transitions. Word has length 97 [2022-04-06 17:05:27,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:05:27,282 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 167 transitions. [2022-04-06 17:05:27,283 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-04-06 17:05:27,283 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 167 transitions. [2022-04-06 17:05:27,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-04-06 17:05:27,283 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:05:27,284 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:05:27,311 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-04-06 17:05:27,484 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:05:27,484 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:05:27,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:05:27,485 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 9 times [2022-04-06 17:05:27,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:05:27,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1395467247] [2022-04-06 17:05:27,485 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:05:27,485 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 10 times [2022-04-06 17:05:27,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:05:27,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965580041] [2022-04-06 17:05:27,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:05:27,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:05:27,493 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:05:27,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [393350596] [2022-04-06 17:05:27,493 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:05:27,493 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:05:27,493 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:05:27,494 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 17:05:27,502 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 17:05:27,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:05:27,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:05:27,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 42 conjunts are in the unsatisfiable core [2022-04-06 17:05:27,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:05:29,164 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-04-06 17:05:29,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:06:10,829 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-04-06 17:06:10,830 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:10,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965580041] [2022-04-06 17:06:10,830 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:10,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393350596] [2022-04-06 17:06:10,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393350596] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:06:10,830 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:06:10,830 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2022-04-06 17:06:10,831 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:10,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1395467247] [2022-04-06 17:06:10,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1395467247] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:10,831 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:10,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:06:10,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298363403] [2022-04-06 17:06:10,831 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:10,831 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:06:10,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:10,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:06:10,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2022-04-06 17:06:10,832 INFO L87 Difference]: Start difference. First operand 138 states and 167 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-04-06 17:06:12,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:12,569 INFO L93 Difference]: Finished difference Result 184 states and 208 transitions. [2022-04-06 17:06:12,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:06:12,570 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 105 [2022-04-06 17:06:12,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:12,571 INFO L225 Difference]: With dead ends: 184 [2022-04-06 17:06:12,571 INFO L226 Difference]: Without dead ends: 147 [2022-04-06 17:06:12,572 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:06:12,572 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 17 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:12,573 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 308 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-04-06 17:06:12,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-04-06 17:06:12,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-04-06 17:06:12,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 95 states have internal predecessors, (98), 36 states have call successors, (36), 21 states have call predecessors, (36), 20 states have return successors, (33), 30 states have call predecessors, (33), 33 states have call successors, (33) [2022-04-06 17:06:12,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 167 transitions. [2022-04-06 17:06:12,592 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 167 transitions. Word has length 105 [2022-04-06 17:06:12,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:12,592 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 167 transitions. [2022-04-06 17:06:12,593 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-04-06 17:06:12,593 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 167 transitions. [2022-04-06 17:06:12,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-04-06 17:06:12,594 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:12,594 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:12,612 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 17:06:12,799 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,SelfDestructingSolverStorable12 [2022-04-06 17:06:12,800 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:12,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:12,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 11 times [2022-04-06 17:06:12,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:12,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1042004077] [2022-04-06 17:06:12,801 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:12,801 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 12 times [2022-04-06 17:06:12,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:12,801 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152622126] [2022-04-06 17:06:12,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:12,801 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:12,808 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:12,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [100510546] [2022-04-06 17:06:12,809 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:06:12,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:12,809 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:12,810 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 17:06:12,814 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 17:06:12,882 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 17:06:12,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:12,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 22 conjunts are in the unsatisfiable core [2022-04-06 17:06:12,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:13,373 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 96 proven. 4 refuted. 0 times theorem prover too weak. 395 trivial. 0 not checked. [2022-04-06 17:06:13,374 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:06:13,973 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:13,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152622126] [2022-04-06 17:06:13,973 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:13,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100510546] [2022-04-06 17:06:13,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100510546] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 17:06:13,974 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:06:13,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-04-06 17:06:13,974 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:13,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1042004077] [2022-04-06 17:06:13,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1042004077] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:13,974 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:13,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:06:13,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [438541876] [2022-04-06 17:06:13,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:13,975 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:06:13,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:13,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:06:13,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-04-06 17:06:13,975 INFO L87 Difference]: Start difference. First operand 147 states and 167 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-04-06 17:06:14,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:14,531 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2022-04-06 17:06:14,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 17:06:14,532 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 114 [2022-04-06 17:06:14,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:14,533 INFO L225 Difference]: With dead ends: 168 [2022-04-06 17:06:14,534 INFO L226 Difference]: Without dead ends: 156 [2022-04-06 17:06:14,534 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:06:14,534 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 20 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:14,535 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 207 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 273 Invalid, 0 Unknown, 62 Unchecked, 0.4s Time] [2022-04-06 17:06:14,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-04-06 17:06:14,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2022-04-06 17:06:14,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 95 states have (on average 1.0842105263157895) internal successors, (103), 100 states have internal predecessors, (103), 38 states have call successors, (38), 22 states have call predecessors, (38), 21 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-04-06 17:06:14,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 176 transitions. [2022-04-06 17:06:14,554 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 176 transitions. Word has length 114 [2022-04-06 17:06:14,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:14,554 INFO L478 AbstractCegarLoop]: Abstraction has 155 states and 176 transitions. [2022-04-06 17:06:14,555 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-04-06 17:06:14,555 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 176 transitions. [2022-04-06 17:06:14,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-04-06 17:06:14,556 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:14,556 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:14,574 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-04-06 17:06:14,763 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,SelfDestructingSolverStorable13 [2022-04-06 17:06:14,764 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:14,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:14,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 3 times [2022-04-06 17:06:14,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:14,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1309535467] [2022-04-06 17:06:14,764 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:14,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 4 times [2022-04-06 17:06:14,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:14,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099096727] [2022-04-06 17:06:14,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:14,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:14,772 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:14,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [703359899] [2022-04-06 17:06:14,773 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:06:14,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:14,773 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:14,792 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 17:06:14,793 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 17:06:14,848 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:06:14,848 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:14,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 43 conjunts are in the unsatisfiable core [2022-04-06 17:06:14,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:15,735 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:06:16,956 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 71 proven. 29 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2022-04-06 17:06:16,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:06:17,065 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:06:26,763 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:26,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099096727] [2022-04-06 17:06:26,763 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:26,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [703359899] [2022-04-06 17:06:26,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [703359899] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 17:06:26,763 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:06:26,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-04-06 17:06:26,764 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:26,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1309535467] [2022-04-06 17:06:26,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1309535467] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:26,764 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:26,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:06:26,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727743414] [2022-04-06 17:06:26,764 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:26,764 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:06:26,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:26,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:06:26,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=549, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:06:26,765 INFO L87 Difference]: Start difference. First operand 155 states and 176 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-04-06 17:06:28,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:28,799 INFO L93 Difference]: Finished difference Result 161 states and 181 transitions. [2022-04-06 17:06:28,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:06:28,800 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) Word has length 116 [2022-04-06 17:06:28,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:28,801 INFO L225 Difference]: With dead ends: 161 [2022-04-06 17:06:28,802 INFO L226 Difference]: Without dead ends: 124 [2022-04-06 17:06:28,802 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2022-04-06 17:06:28,802 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 15 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:28,803 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 305 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 539 Invalid, 0 Unknown, 62 Unchecked, 1.8s Time] [2022-04-06 17:06:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-04-06 17:06:28,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-04-06 17:06:28,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 79 states have internal predecessors, (82), 31 states have call successors, (31), 18 states have call predecessors, (31), 17 states have return successors, (29), 26 states have call predecessors, (29), 29 states have call successors, (29) [2022-04-06 17:06:28,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2022-04-06 17:06:28,817 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 116 [2022-04-06 17:06:28,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:28,817 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2022-04-06 17:06:28,817 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-04-06 17:06:28,817 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2022-04-06 17:06:28,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-04-06 17:06:28,818 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:28,818 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:28,835 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 17:06:29,019 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,SelfDestructingSolverStorable14 [2022-04-06 17:06:29,020 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:29,020 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 5 times [2022-04-06 17:06:29,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:29,020 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [531725625] [2022-04-06 17:06:29,021 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:29,021 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 6 times [2022-04-06 17:06:29,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:29,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986012282] [2022-04-06 17:06:29,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:29,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:29,029 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:29,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1727267761] [2022-04-06 17:06:29,029 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:06:29,029 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:29,029 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:29,030 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 17:06:29,051 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 17:06:29,107 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 17:06:29,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:29,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 6 conjunts are in the unsatisfiable core [2022-04-06 17:06:29,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:29,386 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-04-06 17:06:29,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:06:29,636 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2022-04-06 17:06:29,636 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:29,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986012282] [2022-04-06 17:06:29,636 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:29,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727267761] [2022-04-06 17:06:29,636 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1727267761] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:06:29,636 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:06:29,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2022-04-06 17:06:29,637 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:29,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [531725625] [2022-04-06 17:06:29,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [531725625] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:29,637 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:29,637 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:06:29,637 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006839262] [2022-04-06 17:06:29,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:29,638 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:06:29,638 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:29,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:06:29,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:06:29,638 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-04-06 17:06:29,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:29,723 INFO L93 Difference]: Finished difference Result 150 states and 178 transitions. [2022-04-06 17:06:29,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:06:29,724 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 120 [2022-04-06 17:06:29,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:29,725 INFO L225 Difference]: With dead ends: 150 [2022-04-06 17:06:29,725 INFO L226 Difference]: Without dead ends: 137 [2022-04-06 17:06:29,726 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 230 SyntacticMatches, 5 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:06:29,726 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 18 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:29,726 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 138 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:06:29,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-04-06 17:06:29,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2022-04-06 17:06:29,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 83 states have (on average 1.108433734939759) internal successors, (92), 87 states have internal predecessors, (92), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (34), 31 states have call predecessors, (34), 34 states have call successors, (34) [2022-04-06 17:06:29,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 162 transitions. [2022-04-06 17:06:29,744 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 162 transitions. Word has length 120 [2022-04-06 17:06:29,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:29,744 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 162 transitions. [2022-04-06 17:06:29,744 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-04-06 17:06:29,745 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 162 transitions. [2022-04-06 17:06:29,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-04-06 17:06:29,746 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:29,746 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:29,766 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 17:06:29,955 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,SelfDestructingSolverStorable15 [2022-04-06 17:06:29,955 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:29,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:29,956 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 13 times [2022-04-06 17:06:29,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:29,956 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [192894771] [2022-04-06 17:06:29,956 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:29,957 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 14 times [2022-04-06 17:06:29,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:29,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861513045] [2022-04-06 17:06:29,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:29,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:29,966 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:29,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [714360157] [2022-04-06 17:06:29,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:06:29,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:29,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:29,968 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 17:06:29,974 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 17:06:30,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:06:30,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:30,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 46 conjunts are in the unsatisfiable core [2022-04-06 17:06:30,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:30,941 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 46 proven. 70 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-04-06 17:06:30,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:07:04,270 WARN L232 SmtUtils]: Spent 7.90s on a formula simplification that was a NOOP. DAG size: 142 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:07:45,633 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 46 proven. 70 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2022-04-06 17:07:45,634 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:07:45,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861513045] [2022-04-06 17:07:45,634 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:07:45,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714360157] [2022-04-06 17:07:45,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [714360157] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:07:45,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:07:45,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16] total 26 [2022-04-06 17:07:45,634 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:07:45,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [192894771] [2022-04-06 17:07:45,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [192894771] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:07:45,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:07:45,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:07:45,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903533940] [2022-04-06 17:07:45,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:07:45,635 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:07:45,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:45,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:07:45,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=513, Unknown=1, NotChecked=0, Total=650 [2022-04-06 17:07:45,636 INFO L87 Difference]: Start difference. First operand 137 states and 162 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-04-06 17:07:47,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:07:47,102 INFO L93 Difference]: Finished difference Result 241 states and 293 transitions. [2022-04-06 17:07:47,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:07:47,103 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 122 [2022-04-06 17:07:47,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:07:47,104 INFO L225 Difference]: With dead ends: 241 [2022-04-06 17:07:47,104 INFO L226 Difference]: Without dead ends: 195 [2022-04-06 17:07:47,105 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 217 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=149, Invalid=606, Unknown=1, NotChecked=0, Total=756 [2022-04-06 17:07:47,106 INFO L913 BasicCegarLoop]: 51 mSDtfsCounter, 18 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:07:47,106 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 347 Invalid, 915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-04-06 17:07:47,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-04-06 17:07:47,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 192. [2022-04-06 17:07:47,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 118 states have (on average 1.1101694915254237) internal successors, (131), 123 states have internal predecessors, (131), 49 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2022-04-06 17:07:47,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 227 transitions. [2022-04-06 17:07:47,131 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 227 transitions. Word has length 122 [2022-04-06 17:07:47,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:07:47,131 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 227 transitions. [2022-04-06 17:07:47,132 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 8 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-04-06 17:07:47,132 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 227 transitions. [2022-04-06 17:07:47,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-04-06 17:07:47,133 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:07:47,133 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:07:47,158 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 17:07:47,358 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:47,358 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:07:47,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:07:47,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 15 times [2022-04-06 17:07:47,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:47,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [343743713] [2022-04-06 17:07:47,359 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:07:47,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 16 times [2022-04-06 17:07:47,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:07:47,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [913632604] [2022-04-06 17:07:47,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:07:47,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:07:47,367 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:07:47,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1506981662] [2022-04-06 17:07:47,367 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:07:47,367 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:47,367 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:07:47,368 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 17:07:47,369 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 17:07:47,433 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:07:47,434 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:07:47,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 17:07:47,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:07:47,883 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-04-06 17:07:47,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:08:05,571 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-04-06 17:08:05,571 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:08:05,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [913632604] [2022-04-06 17:08:05,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:08:05,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506981662] [2022-04-06 17:08:05,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506981662] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:08:05,572 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:08:05,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2022-04-06 17:08:05,572 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:08:05,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [343743713] [2022-04-06 17:08:05,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [343743713] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:08:05,572 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:08:05,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 17:08:05,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883101413] [2022-04-06 17:08:05,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:08:05,572 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 17:08:05,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:05,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 17:08:05,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2022-04-06 17:08:05,573 INFO L87 Difference]: Start difference. First operand 192 states and 227 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:08:06,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:08:06,015 INFO L93 Difference]: Finished difference Result 238 states and 285 transitions. [2022-04-06 17:08:06,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 17:08:06,016 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 127 [2022-04-06 17:08:06,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:08:06,018 INFO L225 Difference]: With dead ends: 238 [2022-04-06 17:08:06,018 INFO L226 Difference]: Without dead ends: 209 [2022-04-06 17:08:06,018 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2022-04-06 17:08:06,019 INFO L913 BasicCegarLoop]: 72 mSDtfsCounter, 12 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 17:08:06,019 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 420 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 17:08:06,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-04-06 17:08:06,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2022-04-06 17:08:06,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 128 states have (on average 1.1015625) internal successors, (141), 135 states have internal predecessors, (141), 52 states have call successors, (52), 27 states have call predecessors, (52), 26 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-04-06 17:08:06,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 242 transitions. [2022-04-06 17:08:06,060 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 242 transitions. Word has length 127 [2022-04-06 17:08:06,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:08:06,060 INFO L478 AbstractCegarLoop]: Abstraction has 207 states and 242 transitions. [2022-04-06 17:08:06,060 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:08:06,060 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 242 transitions. [2022-04-06 17:08:06,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-04-06 17:08:06,063 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:08:06,063 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:08:06,091 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 17:08:06,287 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-04-06 17:08:06,288 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:08:06,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:08:06,288 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 17 times [2022-04-06 17:08:06,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:06,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1008082804] [2022-04-06 17:08:06,288 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:08:06,288 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 18 times [2022-04-06 17:08:06,288 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:08:06,289 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373608855] [2022-04-06 17:08:06,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:08:06,289 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:08:06,296 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:08:06,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [160753433] [2022-04-06 17:08:06,296 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:08:06,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:08:06,296 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:08:06,299 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 17:08:06,301 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 17:08:06,553 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2022-04-06 17:08:06,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:08:06,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 83 conjunts are in the unsatisfiable core [2022-04-06 17:08:06,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:08:12,200 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:09:59,735 WARN L232 SmtUtils]: Spent 5.24s on a formula simplification. DAG size of input: 92 DAG size of output: 80 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)