/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/prod4br-ll_valuebound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 16:28:02,088 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 16:28:02,089 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 16:28:02,122 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 16:28:02,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 16:28:02,164 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 16:28:02,169 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 16:28:02,170 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 16:28:02,178 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 16:28:02,179 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 16:28:02,181 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 16:28:02,181 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 16:28:02,181 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 16:28:02,181 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 16:28:02,181 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 16:28:02,182 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 16:28:02,182 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 16:28:02,182 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 16:28:02,182 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 16:28:02,182 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 16:28:02,183 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 16:28:02,183 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 16:28:02,183 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 16:28:02,184 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 16:28:02,184 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 16:28:02,386 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 16:28:02,402 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 16:28:02,404 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 16:28:02,404 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 16:28:02,406 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 16:28:02,407 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound20.c [2022-03-20 16:28:02,473 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/436f64e55/26cc5c0a66564e72a5aae078ad1086da/FLAG10995ac1c [2022-03-20 16:28:02,835 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 16:28:02,835 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound20.c [2022-03-20 16:28:02,839 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/436f64e55/26cc5c0a66564e72a5aae078ad1086da/FLAG10995ac1c [2022-03-20 16:28:02,850 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/436f64e55/26cc5c0a66564e72a5aae078ad1086da [2022-03-20 16:28:02,852 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 16:28:02,853 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 16:28:02,857 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 16:28:02,857 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 16:28:02,860 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 16:28:02,860 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 04:28:02" (1/1) ... [2022-03-20 16:28:02,864 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58665149 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:02, skipping insertion in model container [2022-03-20 16:28:02,864 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 04:28:02" (1/1) ... [2022-03-20 16:28:02,868 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 16:28:02,893 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 16:28:03,033 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/prod4br-ll_valuebound20.c[524,537] [2022-03-20 16:28:03,058 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 16:28:03,063 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 16:28:03,072 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/prod4br-ll_valuebound20.c[524,537] [2022-03-20 16:28:03,090 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 16:28:03,098 INFO L208 MainTranslator]: Completed translation [2022-03-20 16:28:03,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03 WrapperNode [2022-03-20 16:28:03,098 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 16:28:03,099 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 16:28:03,099 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 16:28:03,099 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 16:28:03,108 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,108 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,114 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,114 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,117 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,119 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,119 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 16:28:03,125 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 16:28:03,125 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 16:28:03,126 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 16:28:03,127 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (1/1) ... [2022-03-20 16:28:03,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 16:28:03,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:03,146 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 16:28:03,151 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 16:28:03,176 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 16:28:03,177 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 16:28:03,177 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 16:28:03,177 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 16:28:03,177 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 16:28:03,177 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 16:28:03,178 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 16:28:03,178 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 16:28:03,178 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 16:28:03,178 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 16:28:03,178 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 16:28:03,179 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 16:28:03,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 16:28:03,220 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 16:28:03,221 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 16:28:03,320 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 16:28:03,338 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 16:28:03,338 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 16:28:03,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 04:28:03 BoogieIcfgContainer [2022-03-20 16:28:03,340 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 16:28:03,341 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 16:28:03,341 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 16:28:03,343 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 16:28:03,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 04:28:02" (1/3) ... [2022-03-20 16:28:03,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e8c44cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 04:28:03, skipping insertion in model container [2022-03-20 16:28:03,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 04:28:03" (2/3) ... [2022-03-20 16:28:03,344 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e8c44cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 04:28:03, skipping insertion in model container [2022-03-20 16:28:03,344 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 04:28:03" (3/3) ... [2022-03-20 16:28:03,345 INFO L111 eAbstractionObserver]: Analyzing ICFG prod4br-ll_valuebound20.c [2022-03-20 16:28:03,348 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 16:28:03,348 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 16:28:03,373 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 16:28:03,377 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 16:28:03,377 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 16:28:03,385 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 16:28:03,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 16:28:03,390 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:03,390 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] [2022-03-20 16:28:03,391 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:03,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:03,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 1 times [2022-03-20 16:28:03,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:03,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2044329371] [2022-03-20 16:28:03,405 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:03,406 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 2 times [2022-03-20 16:28:03,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:03,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869399493] [2022-03-20 16:28:03,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:03,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:03,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:28:03,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 16:28:03,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:28:03,535 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 16:28:03,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:28:03,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 16:28:03,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:28:03,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 16:28:03,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 16:28:03,551 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:03,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:03,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869399493] [2022-03-20 16:28:03,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869399493] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:03,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:03,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 16:28:03,555 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:03,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2044329371] [2022-03-20 16:28:03,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2044329371] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:03,555 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:03,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 16:28:03,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218441167] [2022-03-20 16:28:03,556 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:03,559 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 16:28:03,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:03,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 16:28:03,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 16:28:03,578 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) 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) [2022-03-20 16:28:03,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:03,656 INFO L93 Difference]: Finished difference Result 61 states and 88 transitions. [2022-03-20 16:28:03,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 16:28:03,659 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 [2022-03-20 16:28:03,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:03,664 INFO L225 Difference]: With dead ends: 61 [2022-03-20 16:28:03,664 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 16:28:03,666 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 [2022-03-20 16:28:03,668 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:03,669 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 38 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:28:03,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 16:28:03,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 16:28:03,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 16:28:03,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-03-20 16:28:03,695 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 28 [2022-03-20 16:28:03,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:03,695 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-03-20 16:28:03,695 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) [2022-03-20 16:28:03,695 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-03-20 16:28:03,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 16:28:03,696 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:03,697 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] [2022-03-20 16:28:03,697 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 16:28:03,697 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:03,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:03,698 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 1 times [2022-03-20 16:28:03,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:03,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2145285299] [2022-03-20 16:28:03,699 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:03,699 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 2 times [2022-03-20 16:28:03,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:03,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338534383] [2022-03-20 16:28:03,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:03,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:03,714 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:03,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [75941108] [2022-03-20 16:28:03,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:03,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:03,715 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:03,716 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:03,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 16:28:03,754 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 16:28:03,754 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:03,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 16:28:03,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:03,914 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:03,914 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 16:28:03,914 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:03,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338534383] [2022-03-20 16:28:03,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:03,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [75941108] [2022-03-20 16:28:03,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [75941108] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:03,915 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:03,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:28:03,916 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:03,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2145285299] [2022-03-20 16:28:03,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2145285299] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:03,916 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:03,916 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:28:03,917 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976030316] [2022-03-20 16:28:03,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:03,917 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 16:28:03,917 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:03,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 16:28:03,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 16:28:03,918 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 16:28:03,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:03,961 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-03-20 16:28:03,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 16:28:03,961 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-03-20 16:28:03,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:03,962 INFO L225 Difference]: With dead ends: 43 [2022-03-20 16:28:03,962 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 16:28:03,962 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 16:28:03,963 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 9 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:03,967 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 101 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:28:03,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 16:28:03,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-03-20 16:28:03,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 23 states have internal predecessors, (26), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 16:28:03,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-03-20 16:28:03,975 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-03-20 16:28:03,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:03,975 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-03-20 16:28:03,975 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 16:28:03,975 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-03-20 16:28:03,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 16:28:03,976 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:03,976 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, 1] [2022-03-20 16:28:03,995 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-20 16:28:04,192 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:04,192 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:04,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:04,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 1 times [2022-03-20 16:28:04,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:04,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1995572080] [2022-03-20 16:28:04,194 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:04,194 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 2 times [2022-03-20 16:28:04,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:04,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534136998] [2022-03-20 16:28:04,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:04,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:04,208 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:04,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1770098246] [2022-03-20 16:28:04,209 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:04,209 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:04,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:04,210 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:04,211 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 16:28:04,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:04,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:04,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 16:28:04,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:28:04,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:04,795 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:04,796 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:04,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534136998] [2022-03-20 16:28:04,796 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:04,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770098246] [2022-03-20 16:28:04,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770098246] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:04,796 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:04,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 16 [2022-03-20 16:28:04,797 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:04,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1995572080] [2022-03-20 16:28:04,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1995572080] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:04,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:04,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:28:04,797 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391108826] [2022-03-20 16:28:04,797 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:04,797 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:28:04,797 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:04,798 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:28:04,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:28:04,798 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:07,072 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:28:08,242 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:28:08,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:08,299 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2022-03-20 16:28:08,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:28:08,299 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2022-03-20 16:28:08,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:08,300 INFO L225 Difference]: With dead ends: 47 [2022-03-20 16:28:08,300 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 16:28:08,301 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2022-03-20 16:28:08,301 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 40 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:08,302 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 148 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 210 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2022-03-20 16:28:08,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 16:28:08,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2022-03-20 16:28:08,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.24) internal successors, (31), 27 states have internal predecessors, (31), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 16:28:08,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-20 16:28:08,310 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 34 [2022-03-20 16:28:08,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:08,310 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-20 16:28:08,311 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:08,311 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-20 16:28:08,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 16:28:08,311 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:08,311 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:28:08,345 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:08,512 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 16:28:08,512 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:08,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:08,513 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 1 times [2022-03-20 16:28:08,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:08,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [76089986] [2022-03-20 16:28:08,513 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:08,514 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 2 times [2022-03-20 16:28:08,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:08,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1922723857] [2022-03-20 16:28:08,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:08,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:08,524 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:08,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [335424213] [2022-03-20 16:28:08,524 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:08,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:08,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:08,532 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:08,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 16:28:08,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:08,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:08,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 16:28:08,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:11,932 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:28:11,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:12,351 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:28:12,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:12,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1922723857] [2022-03-20 16:28:12,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:12,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335424213] [2022-03-20 16:28:12,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335424213] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:12,357 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:12,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2022-03-20 16:28:12,357 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:12,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [76089986] [2022-03-20 16:28:12,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [76089986] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:12,357 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:12,357 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 16:28:12,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385317319] [2022-03-20 16:28:12,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:12,358 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 16:28:12,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:12,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 16:28:12,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:28:12,359 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:12,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:12,573 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2022-03-20 16:28:12,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 16:28:12,574 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2022-03-20 16:28:12,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:12,575 INFO L225 Difference]: With dead ends: 59 [2022-03-20 16:28:12,575 INFO L226 Difference]: Without dead ends: 57 [2022-03-20 16:28:12,575 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:28:12,576 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 50 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:12,576 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 140 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:28:12,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-20 16:28:12,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 48. [2022-03-20 16:28:12,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 7 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 16:28:12,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 57 transitions. [2022-03-20 16:28:12,587 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 57 transitions. Word has length 36 [2022-03-20 16:28:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:12,588 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 57 transitions. [2022-03-20 16:28:12,588 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:12,588 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 57 transitions. [2022-03-20 16:28:12,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 16:28:12,590 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:12,591 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:28:12,607 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:12,791 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:12,791 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:12,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:12,792 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 1 times [2022-03-20 16:28:12,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:12,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1409696479] [2022-03-20 16:28:12,792 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:12,792 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 2 times [2022-03-20 16:28:12,792 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:12,792 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246633204] [2022-03-20 16:28:12,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:12,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:12,803 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:12,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [856554873] [2022-03-20 16:28:12,803 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:12,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:12,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:12,804 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:12,805 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 16:28:12,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:12,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:12,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 16:28:12,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:13,002 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:13,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:13,276 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:13,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246633204] [2022-03-20 16:28:13,277 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856554873] [2022-03-20 16:28:13,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856554873] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:13,277 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:13,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2022-03-20 16:28:13,277 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1409696479] [2022-03-20 16:28:13,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1409696479] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:13,277 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:13,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 16:28:13,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093880024] [2022-03-20 16:28:13,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:13,278 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 16:28:13,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:13,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 16:28:13,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2022-03-20 16:28:13,279 INFO L87 Difference]: Start difference. First operand 48 states and 57 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 16:28:13,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:13,694 INFO L93 Difference]: Finished difference Result 77 states and 99 transitions. [2022-03-20 16:28:13,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:28:13,695 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2022-03-20 16:28:13,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:13,697 INFO L225 Difference]: With dead ends: 77 [2022-03-20 16:28:13,697 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 16:28:13,697 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2022-03-20 16:28:13,698 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 17 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:13,698 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 161 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:28:13,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 16:28:13,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 59. [2022-03-20 16:28:13,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 42 states have internal predecessors, (50), 12 states have call successors, (12), 8 states have call predecessors, (12), 7 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 16:28:13,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 72 transitions. [2022-03-20 16:28:13,710 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 72 transitions. Word has length 37 [2022-03-20 16:28:13,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:13,711 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 72 transitions. [2022-03-20 16:28:13,711 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 16:28:13,711 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 72 transitions. [2022-03-20 16:28:13,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 16:28:13,712 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:13,712 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, 1] [2022-03-20 16:28:13,745 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:13,929 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:13,930 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:13,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:13,930 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 1 times [2022-03-20 16:28:13,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:13,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [308641180] [2022-03-20 16:28:13,930 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:13,931 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 2 times [2022-03-20 16:28:13,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:13,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336560981] [2022-03-20 16:28:13,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:13,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:13,938 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:13,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [934008328] [2022-03-20 16:28:13,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:13,939 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:13,939 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:13,946 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:13,958 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 16:28:13,995 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:13,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:13,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 16:28:13,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:14,110 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:28:14,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:14,226 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 16:28:14,227 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:14,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336560981] [2022-03-20 16:28:14,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:14,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934008328] [2022-03-20 16:28:14,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934008328] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 16:28:14,227 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:28:14,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2022-03-20 16:28:14,227 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:14,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [308641180] [2022-03-20 16:28:14,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [308641180] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:14,228 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:14,228 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 16:28:14,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601424126] [2022-03-20 16:28:14,228 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:14,228 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 16:28:14,228 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:14,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 16:28:14,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-20 16:28:14,229 INFO L87 Difference]: Start difference. First operand 59 states and 72 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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) [2022-03-20 16:28:14,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:14,359 INFO L93 Difference]: Finished difference Result 65 states and 77 transitions. [2022-03-20 16:28:14,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 16:28:14,359 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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 39 [2022-03-20 16:28:14,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:14,360 INFO L225 Difference]: With dead ends: 65 [2022-03-20 16:28:14,360 INFO L226 Difference]: Without dead ends: 53 [2022-03-20 16:28:14,360 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:28:14,360 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 5 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:14,361 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 128 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 16:28:14,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-20 16:28:14,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-20 16:28:14,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 36 states have (on average 1.2777777777777777) internal successors, (46), 38 states have internal predecessors, (46), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 16:28:14,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 64 transitions. [2022-03-20 16:28:14,369 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 64 transitions. Word has length 39 [2022-03-20 16:28:14,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:14,369 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 64 transitions. [2022-03-20 16:28:14,369 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 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) [2022-03-20 16:28:14,369 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 64 transitions. [2022-03-20 16:28:14,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:28:14,370 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:14,370 INFO L499 BasicCegarLoop]: trace histogram [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, 1] [2022-03-20 16:28:14,386 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:14,586 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:14,587 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:14,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:14,587 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 1 times [2022-03-20 16:28:14,587 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:14,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [281328105] [2022-03-20 16:28:14,588 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:14,588 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 2 times [2022-03-20 16:28:14,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:14,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977568543] [2022-03-20 16:28:14,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:14,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:14,605 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:14,605 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [334238931] [2022-03-20 16:28:14,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:14,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:14,605 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:14,606 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:14,607 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 16:28:14,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:14,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:14,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 28 conjunts are in the unsatisfiable core [2022-03-20 16:28:14,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 16:28:14,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:15,131 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:15,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:15,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977568543] [2022-03-20 16:28:15,131 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:15,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334238931] [2022-03-20 16:28:15,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334238931] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:15,132 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:15,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 15 [2022-03-20 16:28:15,132 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:15,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [281328105] [2022-03-20 16:28:15,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [281328105] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:15,132 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:15,132 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:28:15,132 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314157732] [2022-03-20 16:28:15,132 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:15,132 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:28:15,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:15,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:28:15,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:28:15,133 INFO L87 Difference]: Start difference. First operand 53 states and 64 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:15,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:15,360 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2022-03-20 16:28:15,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 16:28:15,360 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-03-20 16:28:15,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:15,361 INFO L225 Difference]: With dead ends: 78 [2022-03-20 16:28:15,361 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 16:28:15,362 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:28:15,362 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 36 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 224 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 224 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:15,363 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 127 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 224 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:28:15,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 16:28:15,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-03-20 16:28:15,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 46 states have internal predecessors, (57), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 16:28:15,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2022-03-20 16:28:15,371 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 38 [2022-03-20 16:28:15,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:15,371 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2022-03-20 16:28:15,371 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 16:28:15,371 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2022-03-20 16:28:15,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 16:28:15,371 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:15,371 INFO L499 BasicCegarLoop]: trace histogram [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, 1] [2022-03-20 16:28:15,403 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-03-20 16:28:15,588 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:15,588 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:15,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:15,588 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 1 times [2022-03-20 16:28:15,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:15,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [116408590] [2022-03-20 16:28:15,589 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:15,589 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 2 times [2022-03-20 16:28:15,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:15,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893469578] [2022-03-20 16:28:15,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:15,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:15,596 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:15,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1523085010] [2022-03-20 16:28:15,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:15,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:15,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:15,597 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:15,619 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 16:28:15,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:15,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:15,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-20 16:28:15,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:15,828 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:15,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:15,929 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:28:15,930 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:15,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893469578] [2022-03-20 16:28:15,930 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:15,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523085010] [2022-03-20 16:28:15,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523085010] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:15,930 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:15,930 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2022-03-20 16:28:15,930 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:15,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [116408590] [2022-03-20 16:28:15,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [116408590] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:15,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:15,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 16:28:15,931 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836582243] [2022-03-20 16:28:15,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:15,931 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 16:28:15,931 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:15,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 16:28:15,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2022-03-20 16:28:15,931 INFO L87 Difference]: Start difference. First operand 63 states and 77 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 16:28:16,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:16,112 INFO L93 Difference]: Finished difference Result 76 states and 94 transitions. [2022-03-20 16:28:16,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:28:16,113 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 38 [2022-03-20 16:28:16,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:16,114 INFO L225 Difference]: With dead ends: 76 [2022-03-20 16:28:16,114 INFO L226 Difference]: Without dead ends: 74 [2022-03-20 16:28:16,114 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:28:16,114 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:16,114 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 137 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:28:16,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-03-20 16:28:16,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 63. [2022-03-20 16:28:16,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.2954545454545454) internal successors, (57), 46 states have internal predecessors, (57), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 16:28:16,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2022-03-20 16:28:16,123 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 38 [2022-03-20 16:28:16,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:16,123 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2022-03-20 16:28:16,123 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 16:28:16,123 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2022-03-20 16:28:16,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 16:28:16,123 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:16,124 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:28:16,128 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:16,328 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:16,328 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:16,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:16,328 INFO L85 PathProgramCache]: Analyzing trace with hash -982526417, now seen corresponding path program 1 times [2022-03-20 16:28:16,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:16,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1627271251] [2022-03-20 16:28:16,329 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:16,329 INFO L85 PathProgramCache]: Analyzing trace with hash -982526417, now seen corresponding path program 2 times [2022-03-20 16:28:16,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:16,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656040782] [2022-03-20 16:28:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:16,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:16,344 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:16,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [8998247] [2022-03-20 16:28:16,344 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:16,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:16,344 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:16,351 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:16,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 16:28:16,381 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:16,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:16,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-20 16:28:16,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:16,516 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 10 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:28:16,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:16,726 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:28:16,726 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:16,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656040782] [2022-03-20 16:28:16,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:16,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8998247] [2022-03-20 16:28:16,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8998247] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:16,727 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:16,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2022-03-20 16:28:16,727 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:16,727 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1627271251] [2022-03-20 16:28:16,727 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1627271251] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:16,727 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:16,727 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 16:28:16,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829509319] [2022-03-20 16:28:16,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:16,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 16:28:16,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:16,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 16:28:16,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2022-03-20 16:28:16,728 INFO L87 Difference]: Start difference. First operand 63 states and 77 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:28:16,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:16,803 INFO L93 Difference]: Finished difference Result 82 states and 103 transitions. [2022-03-20 16:28:16,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:28:16,804 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 42 [2022-03-20 16:28:16,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:16,804 INFO L225 Difference]: With dead ends: 82 [2022-03-20 16:28:16,804 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 16:28:16,805 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:28:16,805 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 23 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:16,805 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 123 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:28:16,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 16:28:16,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2022-03-20 16:28:16,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 51 states have (on average 1.3137254901960784) internal successors, (67), 54 states have internal predecessors, (67), 14 states have call successors, (14), 8 states have call predecessors, (14), 7 states have return successors, (12), 10 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 16:28:16,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 93 transitions. [2022-03-20 16:28:16,815 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 93 transitions. Word has length 42 [2022-03-20 16:28:16,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:16,815 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 93 transitions. [2022-03-20 16:28:16,816 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:28:16,816 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 93 transitions. [2022-03-20 16:28:16,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 16:28:16,816 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:16,816 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:28:16,837 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:17,033 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-20 16:28:17,033 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:17,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:17,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 1 times [2022-03-20 16:28:17,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:17,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [313373307] [2022-03-20 16:28:17,034 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:17,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 2 times [2022-03-20 16:28:17,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:17,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393581588] [2022-03-20 16:28:17,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:17,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:17,041 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:17,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1832750835] [2022-03-20 16:28:17,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:28:17,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:17,041 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:17,042 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:17,060 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 16:28:17,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:28:17,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:17,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 17 conjunts are in the unsatisfiable core [2022-03-20 16:28:17,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:28:17,208 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:28:17,695 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-20 16:28:17,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:28:17,860 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:28:17,861 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:28:17,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393581588] [2022-03-20 16:28:17,861 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:28:17,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832750835] [2022-03-20 16:28:17,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832750835] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:28:17,861 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:28:17,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 15 [2022-03-20 16:28:17,861 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:28:17,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [313373307] [2022-03-20 16:28:17,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [313373307] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:28:17,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:28:17,876 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:28:17,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269632986] [2022-03-20 16:28:17,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:28:17,876 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:28:17,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:17,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:28:17,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:28:17,877 INFO L87 Difference]: Start difference. First operand 73 states and 93 transitions. Second operand has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:28:19,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:28:19,228 INFO L93 Difference]: Finished difference Result 86 states and 110 transitions. [2022-03-20 16:28:19,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:28:19,229 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2022-03-20 16:28:19,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:28:19,229 INFO L225 Difference]: With dead ends: 86 [2022-03-20 16:28:19,229 INFO L226 Difference]: Without dead ends: 79 [2022-03-20 16:28:19,230 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2022-03-20 16:28:19,230 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 34 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:28:19,230 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 113 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 16:28:19,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-20 16:28:19,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2022-03-20 16:28:19,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 55 states have (on average 1.309090909090909) internal successors, (72), 58 states have internal predecessors, (72), 15 states have call successors, (15), 8 states have call predecessors, (15), 7 states have return successors, (13), 11 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-20 16:28:19,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 100 transitions. [2022-03-20 16:28:19,242 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 100 transitions. Word has length 43 [2022-03-20 16:28:19,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:28:19,242 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 100 transitions. [2022-03-20 16:28:19,242 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (6), 4 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:28:19,242 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 100 transitions. [2022-03-20 16:28:19,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 16:28:19,243 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:28:19,243 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:28:19,277 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 16:28:19,460 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 16:28:19,460 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:28:19,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:28:19,460 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 3 times [2022-03-20 16:28:19,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:28:19,460 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1820098733] [2022-03-20 16:28:19,461 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:28:19,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 4 times [2022-03-20 16:28:19,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:28:19,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210945296] [2022-03-20 16:28:19,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:28:19,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:28:19,474 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:28:19,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [969046562] [2022-03-20 16:28:19,475 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:28:19,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:28:19,475 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:28:19,476 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:28:19,477 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 16:28:19,508 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:28:19,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:28:19,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 16:28:19,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:29:13,647 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 16:29:13,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:30:34,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:30:34,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210945296] [2022-03-20 16:30:34,775 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:30:34,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969046562] [2022-03-20 16:30:34,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969046562] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:30:34,775 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:30:34,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-03-20 16:30:34,775 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:30:34,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1820098733] [2022-03-20 16:30:34,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1820098733] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:30:34,775 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:30:34,775 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:30:34,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104408310] [2022-03-20 16:30:34,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:30:34,776 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:30:34,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:34,776 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:30:34,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=280, Unknown=4, NotChecked=0, Total=342 [2022-03-20 16:30:34,776 INFO L87 Difference]: Start difference. First operand 78 states and 100 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:30:38,774 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:30:40,778 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:30:43,239 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:30:43,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:30:43,301 INFO L93 Difference]: Finished difference Result 116 states and 158 transitions. [2022-03-20 16:30:43,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:30:43,302 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 44 [2022-03-20 16:30:43,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:30:43,303 INFO L225 Difference]: With dead ends: 116 [2022-03-20 16:30:43,303 INFO L226 Difference]: Without dead ends: 114 [2022-03-20 16:30:43,303 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=75, Invalid=383, Unknown=4, NotChecked=0, Total=462 [2022-03-20 16:30:43,303 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 38 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 380 mSolverCounterSat, 11 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 380 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-03-20 16:30:43,303 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 248 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 380 Invalid, 3 Unknown, 0 Unchecked, 6.5s Time] [2022-03-20 16:30:43,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-20 16:30:43,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 92. [2022-03-20 16:30:43,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.3076923076923077) internal successors, (85), 69 states have internal predecessors, (85), 18 states have call successors, (18), 9 states have call predecessors, (18), 8 states have return successors, (16), 13 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 16:30:43,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 119 transitions. [2022-03-20 16:30:43,320 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 119 transitions. Word has length 44 [2022-03-20 16:30:43,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:30:43,320 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 119 transitions. [2022-03-20 16:30:43,320 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 11 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:30:43,321 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 119 transitions. [2022-03-20 16:30:43,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 16:30:43,321 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:30:43,321 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:30:43,338 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 16:30:43,538 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 16:30:43,538 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:30:43,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:30:43,538 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 1 times [2022-03-20 16:30:43,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:43,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [516204592] [2022-03-20 16:30:43,539 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:30:43,539 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 2 times [2022-03-20 16:30:43,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:30:43,539 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [246356185] [2022-03-20 16:30:43,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:30:43,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:30:43,545 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:30:43,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1097369807] [2022-03-20 16:30:43,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:30:43,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:30:43,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:30:43,547 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:30:43,583 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 16:30:43,613 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:30:43,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:30:43,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 16:30:43,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:30:43,732 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 16:30:43,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:30:43,873 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:30:43,873 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:30:43,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [246356185] [2022-03-20 16:30:43,873 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:30:43,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097369807] [2022-03-20 16:30:43,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097369807] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:30:43,873 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:30:43,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-20 16:30:43,873 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:30:43,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [516204592] [2022-03-20 16:30:43,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [516204592] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:30:43,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:30:43,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 16:30:43,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543721909] [2022-03-20 16:30:43,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:30:43,874 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 16:30:43,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:43,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 16:30:43,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 16:30:43,874 INFO L87 Difference]: Start difference. First operand 92 states and 119 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:30:45,902 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:30:48,200 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:30:48,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:30:48,551 INFO L93 Difference]: Finished difference Result 109 states and 144 transitions. [2022-03-20 16:30:48,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 16:30:48,552 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2022-03-20 16:30:48,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:30:48,552 INFO L225 Difference]: With dead ends: 109 [2022-03-20 16:30:48,552 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 16:30:48,553 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:30:48,553 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 159 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-03-20 16:30:48,553 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 186 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 152 Invalid, 2 Unknown, 0 Unchecked, 4.6s Time] [2022-03-20 16:30:48,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 16:30:48,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 87. [2022-03-20 16:30:48,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 65 states have internal predecessors, (77), 17 states have call successors, (17), 9 states have call predecessors, (17), 8 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 16:30:48,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2022-03-20 16:30:48,565 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 44 [2022-03-20 16:30:48,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:30:48,565 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2022-03-20 16:30:48,565 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:30:48,565 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2022-03-20 16:30:48,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 16:30:48,566 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:30:48,566 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:30:48,584 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 16:30:48,779 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 16:30:48,779 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:30:48,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:30:48,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 1 times [2022-03-20 16:30:48,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:48,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [5815747] [2022-03-20 16:30:48,780 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:30:48,780 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 2 times [2022-03-20 16:30:48,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:30:48,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1891258815] [2022-03-20 16:30:48,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:30:48,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:30:48,788 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:30:48,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6150613] [2022-03-20 16:30:48,789 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:30:48,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:30:48,789 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:30:48,790 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:30:48,792 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 16:30:48,838 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:30:48,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:30:48,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 16:30:48,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:30:49,397 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 16:30:49,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:30:49,583 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:30:49,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:30:49,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1891258815] [2022-03-20 16:30:49,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:30:49,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6150613] [2022-03-20 16:30:49,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6150613] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:30:49,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:30:49,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-20 16:30:49,584 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:30:49,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [5815747] [2022-03-20 16:30:49,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [5815747] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:30:49,584 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:30:49,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 16:30:49,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785327076] [2022-03-20 16:30:49,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:30:49,584 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 16:30:49,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:49,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 16:30:49,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:30:49,585 INFO L87 Difference]: Start difference. First operand 87 states and 109 transitions. Second operand has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:30:50,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:30:50,948 INFO L93 Difference]: Finished difference Result 98 states and 123 transitions. [2022-03-20 16:30:50,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 16:30:50,949 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 44 [2022-03-20 16:30:50,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:30:50,949 INFO L225 Difference]: With dead ends: 98 [2022-03-20 16:30:50,949 INFO L226 Difference]: Without dead ends: 91 [2022-03-20 16:30:50,950 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2022-03-20 16:30:50,950 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 38 mSDsluCounter, 170 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:30:50,950 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 191 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 16:30:50,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-20 16:30:50,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 87. [2022-03-20 16:30:50,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 61 states have (on average 1.2622950819672132) internal successors, (77), 65 states have internal predecessors, (77), 17 states have call successors, (17), 9 states have call predecessors, (17), 8 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 16:30:50,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 109 transitions. [2022-03-20 16:30:50,963 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 109 transitions. Word has length 44 [2022-03-20 16:30:50,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:30:50,963 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 109 transitions. [2022-03-20 16:30:50,963 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:30:50,963 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 109 transitions. [2022-03-20 16:30:50,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 16:30:50,964 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:30:50,964 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 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] [2022-03-20 16:30:50,980 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 16:30:51,178 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 16:30:51,178 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:30:51,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:30:51,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 1 times [2022-03-20 16:30:51,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:30:51,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1026891065] [2022-03-20 16:30:51,179 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:30:51,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 2 times [2022-03-20 16:30:51,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:30:51,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124192698] [2022-03-20 16:30:51,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:30:51,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:30:51,184 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:30:51,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [725693280] [2022-03-20 16:30:51,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:30:51,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:30:51,185 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:30:51,192 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:30:51,193 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 16:30:51,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:30:51,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:30:51,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-20 16:30:51,325 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:30:54,783 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 16:30:54,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:31:10,065 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 16:31:10,066 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:31:10,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124192698] [2022-03-20 16:31:10,066 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:31:10,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725693280] [2022-03-20 16:31:10,066 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725693280] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:31:10,066 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:31:10,066 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 14] total 24 [2022-03-20 16:31:10,067 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:31:10,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1026891065] [2022-03-20 16:31:10,067 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1026891065] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:31:10,067 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:31:10,067 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 16:31:10,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288322063] [2022-03-20 16:31:10,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:31:10,068 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 16:31:10,068 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:10,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 16:31:10,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2022-03-20 16:31:10,068 INFO L87 Difference]: Start difference. First operand 87 states and 109 transitions. Second operand has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:31:12,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:31:12,179 INFO L93 Difference]: Finished difference Result 125 states and 160 transitions. [2022-03-20 16:31:12,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 16:31:12,179 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 45 [2022-03-20 16:31:12,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:31:12,180 INFO L225 Difference]: With dead ends: 125 [2022-03-20 16:31:12,180 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 16:31:12,181 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-03-20 16:31:12,181 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 44 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:31:12,181 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 169 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:31:12,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 16:31:12,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2022-03-20 16:31:12,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 58 states have (on average 1.206896551724138) internal successors, (70), 62 states have internal predecessors, (70), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 16:31:12,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 100 transitions. [2022-03-20 16:31:12,196 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 100 transitions. Word has length 45 [2022-03-20 16:31:12,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:31:12,196 INFO L478 AbstractCegarLoop]: Abstraction has 84 states and 100 transitions. [2022-03-20 16:31:12,196 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 13 states have internal predecessors, (22), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 16:31:12,196 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 100 transitions. [2022-03-20 16:31:12,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 16:31:12,197 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:31:12,197 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 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] [2022-03-20 16:31:12,216 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 16:31:12,414 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 16:31:12,415 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:31:12,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:31:12,415 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 1 times [2022-03-20 16:31:12,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:12,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [107992401] [2022-03-20 16:31:12,415 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:31:12,415 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 2 times [2022-03-20 16:31:12,415 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:31:12,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561152014] [2022-03-20 16:31:12,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:31:12,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:31:12,420 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:31:12,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1967176344] [2022-03-20 16:31:12,421 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:31:12,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:31:12,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:31:12,426 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:31:12,427 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 16:31:12,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:31:12,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:31:12,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 39 conjunts are in the unsatisfiable core [2022-03-20 16:31:12,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:31:12,863 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 16:31:12,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:31:13,021 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:31:13,021 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:31:13,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561152014] [2022-03-20 16:31:13,021 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:31:13,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1967176344] [2022-03-20 16:31:13,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1967176344] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:31:13,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:31:13,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 14 [2022-03-20 16:31:13,021 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:31:13,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [107992401] [2022-03-20 16:31:13,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [107992401] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:31:13,022 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:31:13,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-20 16:31:13,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720338980] [2022-03-20 16:31:13,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:31:13,022 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-20 16:31:13,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:13,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-20 16:31:13,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:31:13,022 INFO L87 Difference]: Start difference. First operand 84 states and 100 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:31:13,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:31:13,271 INFO L93 Difference]: Finished difference Result 104 states and 125 transitions. [2022-03-20 16:31:13,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 16:31:13,272 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), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-20 16:31:13,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:31:13,273 INFO L225 Difference]: With dead ends: 104 [2022-03-20 16:31:13,273 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 16:31:13,273 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-03-20 16:31:13,273 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 129 mSDsCounter, 0 mSdLazyCounter, 323 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 323 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:31:13,273 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 151 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 323 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:31:13,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 16:31:13,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 92. [2022-03-20 16:31:13,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.2307692307692308) internal successors, (80), 68 states have internal predecessors, (80), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 12 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 16:31:13,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 110 transitions. [2022-03-20 16:31:13,286 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 110 transitions. Word has length 46 [2022-03-20 16:31:13,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:31:13,286 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 110 transitions. [2022-03-20 16:31:13,286 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), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:31:13,286 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 110 transitions. [2022-03-20 16:31:13,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 16:31:13,287 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:31:13,287 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 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] [2022-03-20 16:31:13,317 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 16:31:13,499 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:31:13,499 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:31:13,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:31:13,500 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 1 times [2022-03-20 16:31:13,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:13,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [8907930] [2022-03-20 16:31:13,500 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:31:13,500 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 2 times [2022-03-20 16:31:13,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:31:13,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689464242] [2022-03-20 16:31:13,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:31:13,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:31:13,507 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:31:13,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1325002431] [2022-03-20 16:31:13,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:31:13,507 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:31:13,507 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:31:13,508 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:31:13,509 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 16:31:13,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:31:13,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:31:13,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 16:31:13,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:31:15,518 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:31:15,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:31:15,662 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:31:15,662 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:31:15,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689464242] [2022-03-20 16:31:15,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:31:15,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325002431] [2022-03-20 16:31:15,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325002431] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:31:15,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:31:15,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 16 [2022-03-20 16:31:15,662 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:31:15,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [8907930] [2022-03-20 16:31:15,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [8907930] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:31:15,663 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:31:15,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:31:15,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221294742] [2022-03-20 16:31:15,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:31:15,664 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:31:15,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:15,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:31:15,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:31:15,665 INFO L87 Difference]: Start difference. First operand 92 states and 110 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:31:15,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:31:15,996 INFO L93 Difference]: Finished difference Result 105 states and 127 transitions. [2022-03-20 16:31:15,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:31:15,996 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-20 16:31:15,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:31:15,998 INFO L225 Difference]: With dead ends: 105 [2022-03-20 16:31:15,998 INFO L226 Difference]: Without dead ends: 103 [2022-03-20 16:31:15,998 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-03-20 16:31:15,999 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:31:15,999 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 144 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 16:31:15,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-20 16:31:16,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 98. [2022-03-20 16:31:16,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 69 states have (on average 1.2173913043478262) internal successors, (84), 73 states have internal predecessors, (84), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 16:31:16,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 116 transitions. [2022-03-20 16:31:16,013 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 116 transitions. Word has length 46 [2022-03-20 16:31:16,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:31:16,013 INFO L478 AbstractCegarLoop]: Abstraction has 98 states and 116 transitions. [2022-03-20 16:31:16,014 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 16:31:16,014 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 116 transitions. [2022-03-20 16:31:16,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 16:31:16,014 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:31:16,014 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 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] [2022-03-20 16:31:16,030 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 16:31:16,227 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 16:31:16,227 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:31:16,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:31:16,228 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 3 times [2022-03-20 16:31:16,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:16,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [399346946] [2022-03-20 16:31:16,229 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:31:16,229 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 4 times [2022-03-20 16:31:16,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:31:16,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666906670] [2022-03-20 16:31:16,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:31:16,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:31:16,238 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:31:16,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1598043779] [2022-03-20 16:31:16,239 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:31:16,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:31:16,239 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:31:16,240 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:31:16,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 16:31:16,448 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:31:16,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:31:16,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 16:31:16,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:31:21,249 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 16:31:21,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:31:24,592 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 16:31:24,592 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:31:24,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666906670] [2022-03-20 16:31:24,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:31:24,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598043779] [2022-03-20 16:31:24,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598043779] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:31:24,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:31:24,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2022-03-20 16:31:24,594 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:31:24,594 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [399346946] [2022-03-20 16:31:24,594 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [399346946] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:31:24,595 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:31:24,595 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 16:31:24,595 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830517233] [2022-03-20 16:31:24,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:31:24,596 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 16:31:24,596 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:24,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 16:31:24,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:31:24,596 INFO L87 Difference]: Start difference. First operand 98 states and 116 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:31:25,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:31:25,703 INFO L93 Difference]: Finished difference Result 125 states and 153 transitions. [2022-03-20 16:31:25,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 16:31:25,703 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-03-20 16:31:25,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:31:25,708 INFO L225 Difference]: With dead ends: 125 [2022-03-20 16:31:25,708 INFO L226 Difference]: Without dead ends: 109 [2022-03-20 16:31:25,708 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:31:25,709 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 21 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 243 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 211 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:31:25,709 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 211 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 243 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-20 16:31:25,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-03-20 16:31:25,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 99. [2022-03-20 16:31:25,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 70 states have (on average 1.2142857142857142) internal successors, (85), 74 states have internal predecessors, (85), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 16:31:25,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2022-03-20 16:31:25,728 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 46 [2022-03-20 16:31:25,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:31:25,728 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2022-03-20 16:31:25,729 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:31:25,729 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2022-03-20 16:31:25,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 16:31:25,729 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:31:25,730 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 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] [2022-03-20 16:31:25,750 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 16:31:25,947 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 16:31:25,948 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:31:25,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:31:25,948 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 3 times [2022-03-20 16:31:25,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:31:25,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1236808317] [2022-03-20 16:31:25,949 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:31:25,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 4 times [2022-03-20 16:31:25,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:31:25,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152923150] [2022-03-20 16:31:25,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:31:25,949 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:31:25,967 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:31:25,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1296451038] [2022-03-20 16:31:25,968 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:31:25,968 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:31:25,968 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:31:25,969 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:31:25,970 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 16:31:26,028 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:31:26,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:31:26,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 16:31:26,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:31:50,087 WARN L855 $PredicateComparison]: unable to prove that (exists ((v_main_~y~0_BEFORE_CALL_62 Int) (v_main_~x~0_BEFORE_CALL_77 Int) (aux_div_v_main_~q~0_BEFORE_CALL_43_40 Int) (aux_div_aux_mod_v_main_~b~0_62_52_33 Int) (aux_mod_v_main_~q~0_BEFORE_CALL_43_40 Int) (v_main_~a~0_BEFORE_CALL_52 Int)) (let ((.cse2 (* aux_div_aux_mod_v_main_~b~0_62_52_33 2)) (.cse0 (* aux_div_v_main_~q~0_BEFORE_CALL_43_40 2)) (.cse1 (* v_main_~y~0_BEFORE_CALL_62 v_main_~x~0_BEFORE_CALL_77))) (and (<= aux_mod_v_main_~q~0_BEFORE_CALL_43_40 0) (or (not (= (+ .cse0 aux_mod_v_main_~q~0_BEFORE_CALL_43_40 (* 4 (* v_main_~a~0_BEFORE_CALL_52 (div (+ .cse0 (* aux_div_aux_mod_v_main_~b~0_62_52_33 (- 2)) (- 2) aux_mod_v_main_~q~0_BEFORE_CALL_43_40 (* v_main_~a~0_BEFORE_CALL_52 (- 2))) 2)))) (+ .cse1 1))) (<= 1 |c___VERIFIER_assert_#in~cond|)) (< .cse2 2) (<= 1 v_main_~y~0_BEFORE_CALL_62) (<= (+ .cse2 v_main_~y~0_BEFORE_CALL_62 (* v_main_~a~0_BEFORE_CALL_52 2) 1) (+ .cse0 aux_mod_v_main_~q~0_BEFORE_CALL_43_40)) (<= 0 .cse2) (<= 0 aux_mod_v_main_~q~0_BEFORE_CALL_43_40) (= (+ .cse0 aux_mod_v_main_~q~0_BEFORE_CALL_43_40 (* (* v_main_~a~0_BEFORE_CALL_52 aux_mod_v_main_~q~0_BEFORE_CALL_43_40) 2) (* (* aux_div_aux_mod_v_main_~b~0_62_52_33 aux_mod_v_main_~q~0_BEFORE_CALL_43_40) 2) (* (* v_main_~a~0_BEFORE_CALL_52 aux_div_v_main_~q~0_BEFORE_CALL_43_40) 4) (* (* aux_div_aux_mod_v_main_~b~0_62_52_33 aux_div_v_main_~q~0_BEFORE_CALL_43_40) 4)) (+ (* (* aux_div_aux_mod_v_main_~b~0_62_52_33 v_main_~a~0_BEFORE_CALL_52) 8) (* (* aux_div_aux_mod_v_main_~b~0_62_52_33 aux_div_aux_mod_v_main_~b~0_62_52_33) 4) (* v_main_~a~0_BEFORE_CALL_52 4) (* aux_div_aux_mod_v_main_~b~0_62_52_33 4) .cse1 (* (* v_main_~a~0_BEFORE_CALL_52 v_main_~a~0_BEFORE_CALL_52) 4) 1))))) is different from true [2022-03-20 16:31:56,831 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 16:31:56,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:01,483 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152923150] [2022-03-20 16:32:01,483 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:01,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296451038] [2022-03-20 16:32:01,483 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296451038] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 16:32:01,483 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:32:01,483 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2022-03-20 16:32:01,484 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:01,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1236808317] [2022-03-20 16:32:01,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1236808317] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:01,484 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:01,484 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 16:32:01,484 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147957521] [2022-03-20 16:32:01,484 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:01,484 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 16:32:01,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:01,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 16:32:01,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=255, Unknown=2, NotChecked=32, Total=342 [2022-03-20 16:32:01,485 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:01,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:01,867 INFO L93 Difference]: Finished difference Result 113 states and 135 transitions. [2022-03-20 16:32:01,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:32:01,868 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 46 [2022-03-20 16:32:01,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:01,868 INFO L225 Difference]: With dead ends: 113 [2022-03-20 16:32:01,868 INFO L226 Difference]: Without dead ends: 111 [2022-03-20 16:32:01,869 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=70, Invalid=352, Unknown=2, NotChecked=38, Total=462 [2022-03-20 16:32:01,869 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 16 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 207 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 95 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:01,869 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 198 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 207 Invalid, 0 Unknown, 95 Unchecked, 0.3s Time] [2022-03-20 16:32:01,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-20 16:32:01,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 109. [2022-03-20 16:32:01,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 77 states have (on average 1.2077922077922079) internal successors, (93), 82 states have internal predecessors, (93), 19 states have call successors, (19), 13 states have call predecessors, (19), 12 states have return successors, (17), 13 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 16:32:01,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 129 transitions. [2022-03-20 16:32:01,885 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 129 transitions. Word has length 46 [2022-03-20 16:32:01,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:01,885 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 129 transitions. [2022-03-20 16:32:01,885 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:01,885 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 129 transitions. [2022-03-20 16:32:01,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 16:32:01,886 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:01,886 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 16:32:01,902 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-03-20 16:32:02,099 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 16:32:02,100 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:02,100 INFO L85 PathProgramCache]: Analyzing trace with hash 156148491, now seen corresponding path program 1 times [2022-03-20 16:32:02,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:02,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1023143651] [2022-03-20 16:32:02,100 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:02,100 INFO L85 PathProgramCache]: Analyzing trace with hash 156148491, now seen corresponding path program 2 times [2022-03-20 16:32:02,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:02,101 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282267887] [2022-03-20 16:32:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:02,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:02,105 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:02,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [254822144] [2022-03-20 16:32:02,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:02,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:02,106 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:02,106 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:02,107 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 16:32:02,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:02,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:02,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 16:32:02,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:02,328 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:32:02,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:02,629 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:32:02,629 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:02,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282267887] [2022-03-20 16:32:02,629 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:02,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254822144] [2022-03-20 16:32:02,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254822144] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:02,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:02,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 15 [2022-03-20 16:32:02,629 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:02,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1023143651] [2022-03-20 16:32:02,629 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1023143651] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:02,629 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:02,630 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 16:32:02,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158880912] [2022-03-20 16:32:02,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:02,630 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 16:32:02,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:02,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 16:32:02,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:32:02,630 INFO L87 Difference]: Start difference. First operand 109 states and 129 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:03,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:03,003 INFO L93 Difference]: Finished difference Result 166 states and 214 transitions. [2022-03-20 16:32:03,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 16:32:03,003 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 47 [2022-03-20 16:32:03,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:03,004 INFO L225 Difference]: With dead ends: 166 [2022-03-20 16:32:03,004 INFO L226 Difference]: Without dead ends: 139 [2022-03-20 16:32:03,004 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2022-03-20 16:32:03,005 INFO L913 BasicCegarLoop]: 30 mSDtfsCounter, 34 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 170 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:03,005 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 201 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 170 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:32:03,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-03-20 16:32:03,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 132. [2022-03-20 16:32:03,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 95 states have (on average 1.2526315789473683) internal successors, (119), 101 states have internal predecessors, (119), 24 states have call successors, (24), 13 states have call predecessors, (24), 12 states have return successors, (22), 17 states have call predecessors, (22), 22 states have call successors, (22) [2022-03-20 16:32:03,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 165 transitions. [2022-03-20 16:32:03,028 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 165 transitions. Word has length 47 [2022-03-20 16:32:03,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:03,028 INFO L478 AbstractCegarLoop]: Abstraction has 132 states and 165 transitions. [2022-03-20 16:32:03,028 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:03,029 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 165 transitions. [2022-03-20 16:32:03,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:32:03,029 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:03,029 INFO L499 BasicCegarLoop]: trace histogram [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, 1] [2022-03-20 16:32:03,048 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 16:32:03,247 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:03,248 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:03,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:03,248 INFO L85 PathProgramCache]: Analyzing trace with hash -399563010, now seen corresponding path program 1 times [2022-03-20 16:32:03,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:03,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [716164873] [2022-03-20 16:32:03,248 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:03,248 INFO L85 PathProgramCache]: Analyzing trace with hash -399563010, now seen corresponding path program 2 times [2022-03-20 16:32:03,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:03,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784092033] [2022-03-20 16:32:03,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:03,249 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:03,253 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:03,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1800302735] [2022-03-20 16:32:03,254 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:03,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:03,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:03,256 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:03,260 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 16:32:03,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:03,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:03,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 16:32:03,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:03,388 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 16:32:03,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:03,495 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 16:32:03,496 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:03,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784092033] [2022-03-20 16:32:03,496 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:03,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800302735] [2022-03-20 16:32:03,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800302735] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 16:32:03,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 16:32:03,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2022-03-20 16:32:03,496 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:03,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [716164873] [2022-03-20 16:32:03,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [716164873] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:03,496 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:03,496 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 16:32:03,496 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120275478] [2022-03-20 16:32:03,496 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:03,497 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 16:32:03,497 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:03,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 16:32:03,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-20 16:32:03,497 INFO L87 Difference]: Start difference. First operand 132 states and 165 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 3 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) [2022-03-20 16:32:03,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:03,548 INFO L93 Difference]: Finished difference Result 163 states and 209 transitions. [2022-03-20 16:32:03,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 16:32:03,548 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 3 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 48 [2022-03-20 16:32:03,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:03,551 INFO L225 Difference]: With dead ends: 163 [2022-03-20 16:32:03,551 INFO L226 Difference]: Without dead ends: 137 [2022-03-20 16:32:03,553 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-20 16:32:03,557 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 3 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:03,558 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 65 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 16:32:03,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-03-20 16:32:03,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 134. [2022-03-20 16:32:03,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 96 states have (on average 1.2604166666666667) internal successors, (121), 102 states have internal predecessors, (121), 25 states have call successors, (25), 13 states have call predecessors, (25), 12 states have return successors, (23), 18 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 16:32:03,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 169 transitions. [2022-03-20 16:32:03,619 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 169 transitions. Word has length 48 [2022-03-20 16:32:03,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:03,620 INFO L478 AbstractCegarLoop]: Abstraction has 134 states and 169 transitions. [2022-03-20 16:32:03,620 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 4 states have internal predecessors, (25), 3 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) [2022-03-20 16:32:03,620 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 169 transitions. [2022-03-20 16:32:03,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:32:03,620 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:03,620 INFO L499 BasicCegarLoop]: trace histogram [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, 1] [2022-03-20 16:32:03,640 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 16:32:03,840 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:03,840 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:03,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:03,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1477889666, now seen corresponding path program 3 times [2022-03-20 16:32:03,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:03,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2130005101] [2022-03-20 16:32:03,841 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:03,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1477889666, now seen corresponding path program 4 times [2022-03-20 16:32:03,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:03,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059561792] [2022-03-20 16:32:03,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:03,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:03,846 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:03,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1036137076] [2022-03-20 16:32:03,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:32:03,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:03,846 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:03,847 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:03,848 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 16:32:03,917 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:32:03,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:03,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 16:32:03,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:05,031 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 16:32:05,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:05,764 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 16:32:05,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:05,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059561792] [2022-03-20 16:32:05,765 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:05,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036137076] [2022-03-20 16:32:05,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036137076] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:05,765 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:05,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2022-03-20 16:32:05,765 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:05,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2130005101] [2022-03-20 16:32:05,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2130005101] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:05,765 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:05,765 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 16:32:05,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774274942] [2022-03-20 16:32:05,766 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:05,766 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 16:32:05,766 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:05,766 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 16:32:05,766 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2022-03-20 16:32:05,766 INFO L87 Difference]: Start difference. First operand 134 states and 169 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:06,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:06,292 INFO L93 Difference]: Finished difference Result 169 states and 216 transitions. [2022-03-20 16:32:06,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 16:32:06,293 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 48 [2022-03-20 16:32:06,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:06,294 INFO L225 Difference]: With dead ends: 169 [2022-03-20 16:32:06,294 INFO L226 Difference]: Without dead ends: 144 [2022-03-20 16:32:06,294 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:32:06,294 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 13 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:06,294 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 222 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 16:32:06,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-03-20 16:32:06,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 144. [2022-03-20 16:32:06,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 104 states have (on average 1.25) internal successors, (130), 110 states have internal predecessors, (130), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 19 states have call predecessors, (24), 24 states have call successors, (24) [2022-03-20 16:32:06,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 180 transitions. [2022-03-20 16:32:06,326 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 180 transitions. Word has length 48 [2022-03-20 16:32:06,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:06,326 INFO L478 AbstractCegarLoop]: Abstraction has 144 states and 180 transitions. [2022-03-20 16:32:06,326 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:06,326 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 180 transitions. [2022-03-20 16:32:06,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-20 16:32:06,327 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:06,327 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:06,344 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-03-20 16:32:06,543 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 16:32:06,544 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:06,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:06,544 INFO L85 PathProgramCache]: Analyzing trace with hash -1420631364, now seen corresponding path program 3 times [2022-03-20 16:32:06,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:06,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1101328032] [2022-03-20 16:32:06,544 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:06,544 INFO L85 PathProgramCache]: Analyzing trace with hash -1420631364, now seen corresponding path program 4 times [2022-03-20 16:32:06,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:06,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636364501] [2022-03-20 16:32:06,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:06,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:06,550 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:06,550 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1246794463] [2022-03-20 16:32:06,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:32:06,550 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:06,550 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:06,551 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:06,552 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 16:32:06,581 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:32:06,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:06,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 16:32:06,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:06,766 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:32:06,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:07,016 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 16:32:07,016 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:07,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636364501] [2022-03-20 16:32:07,016 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:07,016 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246794463] [2022-03-20 16:32:07,016 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246794463] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:07,016 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:07,016 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2022-03-20 16:32:07,017 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:07,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1101328032] [2022-03-20 16:32:07,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1101328032] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:07,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:07,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 16:32:07,017 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962710940] [2022-03-20 16:32:07,017 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:07,017 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 16:32:07,017 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:07,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 16:32:07,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2022-03-20 16:32:07,018 INFO L87 Difference]: Start difference. First operand 144 states and 180 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:07,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:07,292 INFO L93 Difference]: Finished difference Result 173 states and 221 transitions. [2022-03-20 16:32:07,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 16:32:07,292 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 48 [2022-03-20 16:32:07,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:07,293 INFO L225 Difference]: With dead ends: 173 [2022-03-20 16:32:07,293 INFO L226 Difference]: Without dead ends: 148 [2022-03-20 16:32:07,293 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=256, Unknown=0, NotChecked=0, Total=342 [2022-03-20 16:32:07,294 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 16 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:07,294 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 132 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 16:32:07,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-20 16:32:07,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 126. [2022-03-20 16:32:07,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 90 states have (on average 1.1888888888888889) internal successors, (107), 96 states have internal predecessors, (107), 22 states have call successors, (22), 14 states have call predecessors, (22), 13 states have return successors, (20), 15 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-20 16:32:07,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 149 transitions. [2022-03-20 16:32:07,316 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 149 transitions. Word has length 48 [2022-03-20 16:32:07,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:07,316 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 149 transitions. [2022-03-20 16:32:07,316 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 16:32:07,316 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 149 transitions. [2022-03-20 16:32:07,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 16:32:07,317 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:07,317 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 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] [2022-03-20 16:32:07,333 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-20 16:32:07,533 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 16:32:07,533 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:07,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:07,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1275543934, now seen corresponding path program 1 times [2022-03-20 16:32:07,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:07,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [910156930] [2022-03-20 16:32:07,534 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:07,534 INFO L85 PathProgramCache]: Analyzing trace with hash -1275543934, now seen corresponding path program 2 times [2022-03-20 16:32:07,534 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:07,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486396937] [2022-03-20 16:32:07,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:07,534 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:07,538 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:07,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1504319046] [2022-03-20 16:32:07,538 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:07,538 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:07,538 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:07,540 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:07,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 16:32:07,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:07,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:07,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 16:32:07,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:07,714 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 16:32:07,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:07,858 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:32:07,858 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:07,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [486396937] [2022-03-20 16:32:07,858 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:07,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504319046] [2022-03-20 16:32:07,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504319046] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:07,858 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:07,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-20 16:32:07,858 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:07,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [910156930] [2022-03-20 16:32:07,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [910156930] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:07,858 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:07,858 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 16:32:07,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995609785] [2022-03-20 16:32:07,859 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:07,859 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 16:32:07,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:07,859 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 16:32:07,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 16:32:07,859 INFO L87 Difference]: Start difference. First operand 126 states and 149 transitions. Second operand has 9 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:32:09,886 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:12,305 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:13,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:13,113 INFO L93 Difference]: Finished difference Result 139 states and 164 transitions. [2022-03-20 16:32:13,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 16:32:13,114 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 51 [2022-03-20 16:32:13,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:13,114 INFO L225 Difference]: With dead ends: 139 [2022-03-20 16:32:13,114 INFO L226 Difference]: Without dead ends: 132 [2022-03-20 16:32:13,115 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:32:13,115 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 15 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 2 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:13,115 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 174 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 132 Invalid, 2 Unknown, 0 Unchecked, 5.2s Time] [2022-03-20 16:32:13,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-03-20 16:32:13,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 126. [2022-03-20 16:32:13,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 90 states have (on average 1.1777777777777778) internal successors, (106), 96 states have internal predecessors, (106), 22 states have call successors, (22), 14 states have call predecessors, (22), 13 states have return successors, (20), 15 states have call predecessors, (20), 20 states have call successors, (20) [2022-03-20 16:32:13,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 148 transitions. [2022-03-20 16:32:13,137 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 148 transitions. Word has length 51 [2022-03-20 16:32:13,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:13,137 INFO L478 AbstractCegarLoop]: Abstraction has 126 states and 148 transitions. [2022-03-20 16:32:13,137 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:32:13,137 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 148 transitions. [2022-03-20 16:32:13,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 16:32:13,138 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:13,138 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:13,154 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-20 16:32:13,353 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:13,354 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:13,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:13,354 INFO L85 PathProgramCache]: Analyzing trace with hash 38714851, now seen corresponding path program 5 times [2022-03-20 16:32:13,354 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:13,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1294489649] [2022-03-20 16:32:13,355 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:13,355 INFO L85 PathProgramCache]: Analyzing trace with hash 38714851, now seen corresponding path program 6 times [2022-03-20 16:32:13,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:13,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2147071630] [2022-03-20 16:32:13,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:13,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:13,360 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:13,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2064502220] [2022-03-20 16:32:13,362 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:32:13,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:13,362 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:13,363 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:13,364 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 16:32:13,401 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 16:32:13,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:13,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-20 16:32:13,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:13,605 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:32:34,322 WARN L232 SmtUtils]: Spent 14.13s on a formula simplification. DAG size of input: 48 DAG size of output: 34 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:32:36,497 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 11 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 16:32:36,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:36,722 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:32:36,723 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:36,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2147071630] [2022-03-20 16:32:36,723 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:36,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064502220] [2022-03-20 16:32:36,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064502220] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:36,723 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:36,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2022-03-20 16:32:36,723 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:36,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1294489649] [2022-03-20 16:32:36,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1294489649] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:36,723 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:36,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-20 16:32:36,723 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256320499] [2022-03-20 16:32:36,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:36,724 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-20 16:32:36,724 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:36,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-20 16:32:36,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-03-20 16:32:36,724 INFO L87 Difference]: Start difference. First operand 126 states and 148 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 16:32:38,768 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:41,018 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:43,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:43,021 INFO L93 Difference]: Finished difference Result 144 states and 169 transitions. [2022-03-20 16:32:43,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 16:32:43,021 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 52 [2022-03-20 16:32:43,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:43,022 INFO L225 Difference]: With dead ends: 144 [2022-03-20 16:32:43,022 INFO L226 Difference]: Without dead ends: 142 [2022-03-20 16:32:43,022 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 14.5s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2022-03-20 16:32:43,023 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 20 mSDsluCounter, 138 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 6 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:43,023 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 165 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 187 Invalid, 2 Unknown, 0 Unchecked, 6.2s Time] [2022-03-20 16:32:43,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-03-20 16:32:43,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 134. [2022-03-20 16:32:43,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 96 states have (on average 1.1770833333333333) internal successors, (113), 102 states have internal predecessors, (113), 23 states have call successors, (23), 15 states have call predecessors, (23), 14 states have return successors, (21), 16 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 16:32:43,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 157 transitions. [2022-03-20 16:32:43,046 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 157 transitions. Word has length 52 [2022-03-20 16:32:43,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:43,046 INFO L478 AbstractCegarLoop]: Abstraction has 134 states and 157 transitions. [2022-03-20 16:32:43,046 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 16:32:43,046 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 157 transitions. [2022-03-20 16:32:43,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 16:32:43,046 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:43,046 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 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] [2022-03-20 16:32:43,063 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 16:32:43,249 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:43,249 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:43,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:43,249 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 1 times [2022-03-20 16:32:43,249 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:43,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1444686209] [2022-03-20 16:32:43,249 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:43,250 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 2 times [2022-03-20 16:32:43,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:43,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311601762] [2022-03-20 16:32:43,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:43,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:43,262 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:43,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [48273792] [2022-03-20 16:32:43,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:32:43,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:43,262 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:43,270 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:43,271 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-20 16:32:43,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:32:43,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:43,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-20 16:32:43,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:32:43,810 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:32:43,811 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:32:43,995 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:32:43,996 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:32:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311601762] [2022-03-20 16:32:43,996 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:32:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48273792] [2022-03-20 16:32:43,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48273792] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:32:43,996 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:32:43,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-20 16:32:43,996 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:32:43,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1444686209] [2022-03-20 16:32:43,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1444686209] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:32:43,996 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:32:43,996 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 16:32:43,996 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221083575] [2022-03-20 16:32:43,996 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:32:43,996 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 16:32:43,997 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:43,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 16:32:43,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2022-03-20 16:32:43,997 INFO L87 Difference]: Start difference. First operand 134 states and 157 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 16:32:46,370 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:48,630 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:50,602 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.79s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:52,647 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:54,670 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:32:54,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:32:54,767 INFO L93 Difference]: Finished difference Result 164 states and 197 transitions. [2022-03-20 16:32:54,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 16:32:54,768 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 52 [2022-03-20 16:32:54,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:32:54,769 INFO L225 Difference]: With dead ends: 164 [2022-03-20 16:32:54,769 INFO L226 Difference]: Without dead ends: 157 [2022-03-20 16:32:54,769 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-03-20 16:32:54,769 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 50 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 25 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2022-03-20 16:32:54,769 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 143 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 232 Invalid, 4 Unknown, 0 Unchecked, 10.4s Time] [2022-03-20 16:32:54,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-03-20 16:32:54,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 138. [2022-03-20 16:32:54,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 100 states have (on average 1.2) internal successors, (120), 105 states have internal predecessors, (120), 23 states have call successors, (23), 15 states have call predecessors, (23), 14 states have return successors, (21), 17 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 16:32:54,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 164 transitions. [2022-03-20 16:32:54,797 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 164 transitions. Word has length 52 [2022-03-20 16:32:54,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:32:54,797 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 164 transitions. [2022-03-20 16:32:54,797 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 16:32:54,797 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 164 transitions. [2022-03-20 16:32:54,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 16:32:54,798 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:32:54,798 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:32:54,814 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-20 16:32:55,014 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-03-20 16:32:55,014 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:32:55,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:32:55,015 INFO L85 PathProgramCache]: Analyzing trace with hash -966510965, now seen corresponding path program 3 times [2022-03-20 16:32:55,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:32:55,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [431477242] [2022-03-20 16:32:55,015 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:32:55,015 INFO L85 PathProgramCache]: Analyzing trace with hash -966510965, now seen corresponding path program 4 times [2022-03-20 16:32:55,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:32:55,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197259386] [2022-03-20 16:32:55,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:32:55,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:32:55,019 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:32:55,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [693833509] [2022-03-20 16:32:55,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 16:32:55,019 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:32:55,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:32:55,021 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:32:55,021 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-20 16:32:55,098 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 16:32:55,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:32:55,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 16:32:55,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:25,442 WARN L232 SmtUtils]: Spent 5.82s on a formula simplification. DAG size of input: 11 DAG size of output: 1 (called from [L1067] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2022-03-20 16:33:34,889 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 17 proven. 19 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 16:33:34,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:35,574 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:33:35,574 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:35,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197259386] [2022-03-20 16:33:35,575 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:35,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693833509] [2022-03-20 16:33:35,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693833509] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:35,575 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:35,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 17 [2022-03-20 16:33:35,575 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:35,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [431477242] [2022-03-20 16:33:35,575 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [431477242] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:35,575 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:35,575 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 16:33:35,575 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821133185] [2022-03-20 16:33:35,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:35,575 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 16:33:35,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:35,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 16:33:35,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-03-20 16:33:35,576 INFO L87 Difference]: Start difference. First operand 138 states and 164 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-03-20 16:33:36,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:36,182 INFO L93 Difference]: Finished difference Result 178 states and 216 transitions. [2022-03-20 16:33:36,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:33:36,182 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) Word has length 53 [2022-03-20 16:33:36,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:36,183 INFO L225 Difference]: With dead ends: 178 [2022-03-20 16:33:36,183 INFO L226 Difference]: Without dead ends: 156 [2022-03-20 16:33:36,183 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 87 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2022-03-20 16:33:36,183 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 35 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:36,184 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 258 Invalid, 462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 16:33:36,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-03-20 16:33:36,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 147. [2022-03-20 16:33:36,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 107 states have (on average 1.205607476635514) internal successors, (129), 112 states have internal predecessors, (129), 24 states have call successors, (24), 16 states have call predecessors, (24), 15 states have return successors, (22), 18 states have call predecessors, (22), 22 states have call successors, (22) [2022-03-20 16:33:36,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 175 transitions. [2022-03-20 16:33:36,222 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 175 transitions. Word has length 53 [2022-03-20 16:33:36,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:36,222 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 175 transitions. [2022-03-20 16:33:36,222 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 5 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 4 states have call successors, (7) [2022-03-20 16:33:36,222 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 175 transitions. [2022-03-20 16:33:36,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 16:33:36,222 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:36,222 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:36,240 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-20 16:33:36,425 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-03-20 16:33:36,425 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:36,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:36,425 INFO L85 PathProgramCache]: Analyzing trace with hash -1920594434, now seen corresponding path program 5 times [2022-03-20 16:33:36,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:36,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [747916396] [2022-03-20 16:33:36,426 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:33:36,426 INFO L85 PathProgramCache]: Analyzing trace with hash -1920594434, now seen corresponding path program 6 times [2022-03-20 16:33:36,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:36,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1958862284] [2022-03-20 16:33:36,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:36,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:36,430 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:36,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [657808836] [2022-03-20 16:33:36,430 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:33:36,430 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:36,430 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:36,433 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:33:36,434 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-20 16:33:36,484 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 16:33:36,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:36,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 16:33:36,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:36,668 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:33:36,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:37,033 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:33:37,033 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:37,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1958862284] [2022-03-20 16:33:37,034 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:37,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657808836] [2022-03-20 16:33:37,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657808836] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:37,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:37,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-03-20 16:33:37,034 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:37,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [747916396] [2022-03-20 16:33:37,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [747916396] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:37,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:37,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 16:33:37,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490644197] [2022-03-20 16:33:37,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:37,034 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 16:33:37,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:37,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 16:33:37,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2022-03-20 16:33:37,035 INFO L87 Difference]: Start difference. First operand 147 states and 175 transitions. Second operand has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:33:38,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:38,160 INFO L93 Difference]: Finished difference Result 165 states and 195 transitions. [2022-03-20 16:33:38,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 16:33:38,160 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 54 [2022-03-20 16:33:38,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:38,161 INFO L225 Difference]: With dead ends: 165 [2022-03-20 16:33:38,161 INFO L226 Difference]: Without dead ends: 163 [2022-03-20 16:33:38,161 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:33:38,162 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 18 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:38,162 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 160 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 16:33:38,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2022-03-20 16:33:38,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 147. [2022-03-20 16:33:38,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 108 states have (on average 1.2222222222222223) internal successors, (132), 112 states have internal predecessors, (132), 23 states have call successors, (23), 16 states have call predecessors, (23), 15 states have return successors, (21), 18 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 16:33:38,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 176 transitions. [2022-03-20 16:33:38,194 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 176 transitions. Word has length 54 [2022-03-20 16:33:38,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:38,194 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 176 transitions. [2022-03-20 16:33:38,194 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 16:33:38,195 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 176 transitions. [2022-03-20 16:33:38,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 16:33:38,195 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:38,195 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:38,217 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-03-20 16:33:38,410 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-03-20 16:33:38,410 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:38,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:38,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1863336132, now seen corresponding path program 5 times [2022-03-20 16:33:38,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:38,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [215533284] [2022-03-20 16:33:38,411 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:33:38,411 INFO L85 PathProgramCache]: Analyzing trace with hash -1863336132, now seen corresponding path program 6 times [2022-03-20 16:33:38,411 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:38,411 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682782350] [2022-03-20 16:33:38,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:38,411 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:38,415 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:38,415 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1420805874] [2022-03-20 16:33:38,415 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 16:33:38,415 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:38,416 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:38,418 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:33:38,419 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-20 16:33:38,489 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 16:33:38,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:38,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 16:33:38,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:39,328 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 13 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-20 16:33:39,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:33:39,744 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 16:33:39,745 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:33:39,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682782350] [2022-03-20 16:33:39,745 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:33:39,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420805874] [2022-03-20 16:33:39,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420805874] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:33:39,745 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:33:39,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2022-03-20 16:33:39,745 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:33:39,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [215533284] [2022-03-20 16:33:39,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [215533284] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:33:39,745 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:33:39,745 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 16:33:39,745 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555095636] [2022-03-20 16:33:39,745 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:33:39,745 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 16:33:39,746 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:39,746 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 16:33:39,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2022-03-20 16:33:39,746 INFO L87 Difference]: Start difference. First operand 147 states and 176 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 16:33:44,632 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:46,329 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.32s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:48,331 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:33:49,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:33:49,047 INFO L93 Difference]: Finished difference Result 167 states and 198 transitions. [2022-03-20 16:33:49,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 16:33:49,047 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 54 [2022-03-20 16:33:49,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:33:49,048 INFO L225 Difference]: With dead ends: 167 [2022-03-20 16:33:49,048 INFO L226 Difference]: Without dead ends: 165 [2022-03-20 16:33:49,048 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2022-03-20 16:33:49,048 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 23 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 7 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 184 SdHoareTripleChecker+Invalid, 220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2022-03-20 16:33:49,049 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 184 Invalid, 220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 211 Invalid, 2 Unknown, 0 Unchecked, 9.2s Time] [2022-03-20 16:33:49,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2022-03-20 16:33:49,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 153. [2022-03-20 16:33:49,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 112 states have (on average 1.2142857142857142) internal successors, (136), 117 states have internal predecessors, (136), 24 states have call successors, (24), 17 states have call predecessors, (24), 16 states have return successors, (22), 18 states have call predecessors, (22), 22 states have call successors, (22) [2022-03-20 16:33:49,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 182 transitions. [2022-03-20 16:33:49,080 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 182 transitions. Word has length 54 [2022-03-20 16:33:49,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:33:49,081 INFO L478 AbstractCegarLoop]: Abstraction has 153 states and 182 transitions. [2022-03-20 16:33:49,081 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 16:33:49,081 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 182 transitions. [2022-03-20 16:33:49,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 16:33:49,081 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:33:49,081 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:33:49,098 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-20 16:33:49,297 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-03-20 16:33:49,297 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:33:49,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:33:49,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1650428610, now seen corresponding path program 7 times [2022-03-20 16:33:49,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:33:49,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1808855807] [2022-03-20 16:33:49,298 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:33:49,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1650428610, now seen corresponding path program 8 times [2022-03-20 16:33:49,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:33:49,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802331283] [2022-03-20 16:33:49,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:33:49,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:33:49,309 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:33:49,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [967243109] [2022-03-20 16:33:49,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:33:49,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:33:49,309 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:33:49,310 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:33:49,311 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-20 16:33:49,359 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:33:49,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:33:49,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 16:33:49,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 16:33:54,732 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:34:31,556 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-03-20 16:34:31,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 16:34:48,404 WARN L232 SmtUtils]: Spent 8.06s on a formula simplification that was a NOOP. DAG size: 35 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 16:34:52,636 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 16:34:52,880 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 23 proven. 3 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-03-20 16:34:52,880 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 16:34:52,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802331283] [2022-03-20 16:34:52,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 16:34:52,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967243109] [2022-03-20 16:34:52,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967243109] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 16:34:52,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 16:34:52,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 20 [2022-03-20 16:34:52,881 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 16:34:52,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1808855807] [2022-03-20 16:34:52,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1808855807] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 16:34:52,881 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 16:34:52,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 16:34:52,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901673409] [2022-03-20 16:34:52,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 16:34:52,881 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 16:34:52,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 16:34:52,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 16:34:52,881 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=316, Unknown=1, NotChecked=0, Total=380 [2022-03-20 16:34:52,882 INFO L87 Difference]: Start difference. First operand 153 states and 182 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 16:34:58,403 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:35:00,408 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:35:02,001 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.59s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 16:35:04,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 16:35:04,591 INFO L93 Difference]: Finished difference Result 177 states and 211 transitions. [2022-03-20 16:35:04,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 16:35:04,592 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 54 [2022-03-20 16:35:04,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 16:35:04,593 INFO L225 Difference]: With dead ends: 177 [2022-03-20 16:35:04,593 INFO L226 Difference]: Without dead ends: 175 [2022-03-20 16:35:04,593 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=80, Invalid=425, Unknown=1, NotChecked=0, Total=506 [2022-03-20 16:35:04,593 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 60 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 412 mSolverCounterSat, 31 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 412 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.6s IncrementalHoareTripleChecker+Time [2022-03-20 16:35:04,593 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 188 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 412 Invalid, 2 Unknown, 0 Unchecked, 11.6s Time] [2022-03-20 16:35:04,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-03-20 16:35:04,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2022-03-20 16:35:04,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 125 states have (on average 1.2) internal successors, (150), 132 states have internal predecessors, (150), 27 states have call successors, (27), 19 states have call predecessors, (27), 18 states have return successors, (25), 19 states have call predecessors, (25), 25 states have call successors, (25) [2022-03-20 16:35:04,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 202 transitions. [2022-03-20 16:35:04,632 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 202 transitions. Word has length 54 [2022-03-20 16:35:04,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 16:35:04,632 INFO L478 AbstractCegarLoop]: Abstraction has 171 states and 202 transitions. [2022-03-20 16:35:04,632 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 14 states have internal predecessors, (29), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 16:35:04,632 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 202 transitions. [2022-03-20 16:35:04,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 16:35:04,633 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 16:35:04,633 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 16:35:04,665 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-03-20 16:35:04,849 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-03-20 16:35:04,850 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 16:35:04,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 16:35:04,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1633421436, now seen corresponding path program 7 times [2022-03-20 16:35:04,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 16:35:04,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1486913209] [2022-03-20 16:35:04,851 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 16:35:04,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1633421436, now seen corresponding path program 8 times [2022-03-20 16:35:04,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 16:35:04,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277066127] [2022-03-20 16:35:04,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 16:35:04,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 16:35:04,858 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 16:35:04,858 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [836496818] [2022-03-20 16:35:04,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 16:35:04,858 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 16:35:04,858 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 16:35:04,859 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 16:35:04,860 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-20 16:35:04,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 16:35:04,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 16:35:04,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-20 16:35:04,904 INFO L286 TraceCheckSpWp]: Computing forward predicates...