/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 17:03:48,379 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 17:03:48,380 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 17:03:48,441 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 17:03:48,478 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 17:03:48,478 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 17:03:48,479 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 17:03:48,480 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 17:03:48,488 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 17:03:48,488 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 17:03:48,489 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 17:03:48,490 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 17:03:48,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 17:03:48,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:03:48,492 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 17:03:48,492 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 17:03:48,677 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 17:03:48,698 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 17:03:48,700 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 17:03:48,700 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 17:03:48,701 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 17:03:48,701 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound50.c [2022-04-06 17:03:48,739 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b61751800/d1ddbaa3ca944dcc93882c7a49920807/FLAGda9e1f2f8 [2022-04-06 17:03:49,081 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 17:03:49,084 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound50.c [2022-04-06 17:03:49,089 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b61751800/d1ddbaa3ca944dcc93882c7a49920807/FLAGda9e1f2f8 [2022-04-06 17:03:49,102 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b61751800/d1ddbaa3ca944dcc93882c7a49920807 [2022-04-06 17:03:49,104 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 17:03:49,106 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 17:03:49,107 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 17:03:49,107 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 17:03:49,124 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 17:03:49,124 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,125 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@291b6a58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49, skipping insertion in model container [2022-04-06 17:03:49,125 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,130 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 17:03:49,141 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 17:03:49,279 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound50.c[538,551] [2022-04-06 17:03:49,296 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:03:49,304 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 17:03:49,312 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_valuebound50.c[538,551] [2022-04-06 17:03:49,326 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 17:03:49,336 INFO L208 MainTranslator]: Completed translation [2022-04-06 17:03:49,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49 WrapperNode [2022-04-06 17:03:49,337 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 17:03:49,338 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 17:03:49,338 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 17:03:49,338 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 17:03:49,346 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,346 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,352 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,360 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,365 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,370 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,373 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 17:03:49,373 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 17:03:49,374 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 17:03:49,374 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 17:03:49,374 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (1/1) ... [2022-04-06 17:03:49,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 17:03:49,387 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:49,433 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 17:03:49,446 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 17:03:49,465 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 17:03:49,466 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 17:03:49,466 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 17:03:49,466 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 17:03:49,466 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 17:03:49,466 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 17:03:49,466 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 17:03:49,466 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 17:03:49,467 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 17:03:49,467 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 17:03:49,467 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-04-06 17:03:49,468 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 17:03:49,468 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 17:03:49,468 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 17:03:49,468 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 17:03:49,468 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 17:03:49,469 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 17:03:49,469 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 17:03:49,469 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 17:03:49,469 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 17:03:49,513 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 17:03:49,515 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 17:03:49,656 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 17:03:49,660 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 17:03:49,660 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-06 17:03:49,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:03:49 BoogieIcfgContainer [2022-04-06 17:03:49,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 17:03:49,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 17:03:49,663 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 17:03:49,681 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 17:03:49,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 05:03:49" (1/3) ... [2022-04-06 17:03:49,682 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92f36ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:03:49, skipping insertion in model container [2022-04-06 17:03:49,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 05:03:49" (2/3) ... [2022-04-06 17:03:49,682 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@92f36ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 05:03:49, skipping insertion in model container [2022-04-06 17:03:49,682 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 05:03:49" (3/3) ... [2022-04-06 17:03:49,683 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_valuebound50.c [2022-04-06 17:03:49,686 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 17:03:49,686 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 17:03:49,713 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 17:03:49,717 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 17:03:49,717 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 17:03:49,726 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-04-06 17:03:49,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 17:03:49,732 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:49,732 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:49,733 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:49,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:49,736 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 1 times [2022-04-06 17:03:49,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:49,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [388387980] [2022-04-06 17:03:49,748 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:49,749 INFO L85 PathProgramCache]: Analyzing trace with hash -1784424332, now seen corresponding path program 2 times [2022-04-06 17:03:49,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:49,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612289855] [2022-04-06 17:03:49,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:49,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:49,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:49,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:03:49,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:49,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:03:49,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:49,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:03:49,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:49,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:03:49,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:49,929 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:03:49,930 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:49,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612289855] [2022-04-06 17:03:49,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [612289855] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:49,930 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:49,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:03:49,932 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:49,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [388387980] [2022-04-06 17:03:49,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [388387980] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:49,933 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:49,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 17:03:49,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204539278] [2022-04-06 17:03:49,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:49,936 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 17:03:49,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:49,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 17:03:49,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 17:03:49,954 INFO L87 Difference]: Start difference. First operand has 38 states, 20 states have (on average 1.5) internal successors, (30), 21 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:03:50,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:50,049 INFO L93 Difference]: Finished difference Result 69 states and 110 transitions. [2022-04-06 17:03:50,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 17:03:50,051 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-04-06 17:03:50,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:50,055 INFO L225 Difference]: With dead ends: 69 [2022-04-06 17:03:50,056 INFO L226 Difference]: Without dead ends: 33 [2022-04-06 17:03:50,059 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 17:03:50,064 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:50,066 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:03:50,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-06 17:03:50,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-04-06 17:03:50,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:03:50,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions. [2022-04-06 17:03:50,099 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 28 [2022-04-06 17:03:50,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:50,099 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 43 transitions. [2022-04-06 17:03:50,099 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-04-06 17:03:50,100 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions. [2022-04-06 17:03:50,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 17:03:50,101 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:50,102 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:50,102 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 17:03:50,102 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:50,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:50,106 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 1 times [2022-04-06 17:03:50,106 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1474800786] [2022-04-06 17:03:50,107 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:50,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1361835634, now seen corresponding path program 2 times [2022-04-06 17:03:50,107 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:50,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947966619] [2022-04-06 17:03:50,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:50,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:50,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:03:50,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,202 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:03:50,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,220 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:03:50,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:03:50,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,233 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:03:50,233 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:50,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947966619] [2022-04-06 17:03:50,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947966619] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:03:50,234 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:50,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1474800786] [2022-04-06 17:03:50,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1474800786] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:03:50,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842869248] [2022-04-06 17:03:50,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:50,235 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:03:50,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:03:50,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:03:50,236 INFO L87 Difference]: Start difference. First operand 33 states and 43 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 17:03:50,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:50,423 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-04-06 17:03:50,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:03:50,424 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-04-06 17:03:50,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:50,425 INFO L225 Difference]: With dead ends: 46 [2022-04-06 17:03:50,425 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 17:03:50,425 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:03:50,426 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 38 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:50,426 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 48 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:03:50,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 17:03:50,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-04-06 17:03:50,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 12 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:03:50,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2022-04-06 17:03:50,435 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 28 [2022-04-06 17:03:50,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:50,435 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2022-04-06 17:03:50,435 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-04-06 17:03:50,435 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2022-04-06 17:03:50,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-04-06 17:03:50,436 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:50,436 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:50,436 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 17:03:50,436 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:50,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:50,437 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 1 times [2022-04-06 17:03:50,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1612495556] [2022-04-06 17:03:50,437 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:50,438 INFO L85 PathProgramCache]: Analyzing trace with hash 1382067636, now seen corresponding path program 2 times [2022-04-06 17:03:50,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:50,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506666126] [2022-04-06 17:03:50,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:50,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:50,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,500 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 17:03:50,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 17:03:50,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,509 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-04-06 17:03:50,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 17:03:50,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2022-04-06 17:03:50,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 17:03:50,523 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 17:03:50,523 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:50,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506666126] [2022-04-06 17:03:50,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506666126] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,524 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:03:50,524 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:50,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1612495556] [2022-04-06 17:03:50,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1612495556] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,525 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:03:50,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12358388] [2022-04-06 17:03:50,525 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:50,525 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:03:50,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,525 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:03:50,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:03:50,526 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 17:03:50,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:50,669 INFO L93 Difference]: Finished difference Result 50 states and 63 transitions. [2022-04-06 17:03:50,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 17:03:50,670 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2022-04-06 17:03:50,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:50,671 INFO L225 Difference]: With dead ends: 50 [2022-04-06 17:03:50,671 INFO L226 Difference]: Without dead ends: 48 [2022-04-06 17:03:50,671 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:03:50,672 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 33 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:50,673 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 48 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:03:50,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-04-06 17:03:50,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-04-06 17:03:50,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-04-06 17:03:50,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-04-06 17:03:50,681 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 33 [2022-04-06 17:03:50,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:50,682 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-04-06 17:03:50,682 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-04-06 17:03:50,682 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-04-06 17:03:50,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-04-06 17:03:50,682 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:50,683 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:50,683 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 17:03:50,683 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:50,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:50,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 1 times [2022-04-06 17:03:50,683 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1850523845] [2022-04-06 17:03:50,684 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:50,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1455208590, now seen corresponding path program 2 times [2022-04-06 17:03:50,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:50,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876509033] [2022-04-06 17:03:50,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:50,685 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:50,694 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:50,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [937488865] [2022-04-06 17:03:50,695 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:50,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:50,695 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:50,703 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:50,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 17:03:50,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:50,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:50,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:03:50,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:50,896 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 17:03:50,896 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:03:50,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:50,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876509033] [2022-04-06 17:03:50,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:50,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937488865] [2022-04-06 17:03:50,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937488865] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:03:50,898 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:50,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1850523845] [2022-04-06 17:03:50,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1850523845] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:50,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:50,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:03:50,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138409396] [2022-04-06 17:03:50,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:50,899 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:03:50,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:50,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:03:50,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:03:50,899 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:03:50,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:50,955 INFO L93 Difference]: Finished difference Result 69 states and 89 transitions. [2022-04-06 17:03:50,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:03:50,955 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 38 [2022-04-06 17:03:50,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:50,957 INFO L225 Difference]: With dead ends: 69 [2022-04-06 17:03:50,957 INFO L226 Difference]: Without dead ends: 55 [2022-04-06 17:03:50,957 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:03:50,958 INFO L913 BasicCegarLoop]: 45 mSDtfsCounter, 8 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:50,958 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 145 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:03:50,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-04-06 17:03:50,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-04-06 17:03:50,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 18 states have call successors, (18), 7 states have call predecessors, (18), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2022-04-06 17:03:50,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2022-04-06 17:03:50,970 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 38 [2022-04-06 17:03:50,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:50,970 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2022-04-06 17:03:50,971 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-04-06 17:03:50,971 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2022-04-06 17:03:50,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-06 17:03:50,972 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:50,972 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:50,999 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:51,196 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:51,196 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:51,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:51,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 1 times [2022-04-06 17:03:51,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:51,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [321046634] [2022-04-06 17:03:51,198 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:51,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1688067263, now seen corresponding path program 2 times [2022-04-06 17:03:51,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:51,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003060676] [2022-04-06 17:03:51,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:51,198 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:51,217 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:51,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674540632] [2022-04-06 17:03:51,217 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:51,217 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:51,218 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:51,232 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:51,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 17:03:51,279 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:51,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:51,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 14 conjunts are in the unsatisfiable core [2022-04-06 17:03:51,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:51,577 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-04-06 17:03:51,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:03:51,742 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 17:03:51,743 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:51,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003060676] [2022-04-06 17:03:51,743 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:51,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674540632] [2022-04-06 17:03:51,743 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674540632] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 17:03:51,743 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:03:51,743 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 11 [2022-04-06 17:03:51,744 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:51,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [321046634] [2022-04-06 17:03:51,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [321046634] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:51,744 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:51,744 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:03:51,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823714368] [2022-04-06 17:03:51,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:51,744 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:03:51,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:51,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:03:51,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:03:51,745 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:03:51,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:51,825 INFO L93 Difference]: Finished difference Result 68 states and 85 transitions. [2022-04-06 17:03:51,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:03:51,826 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 45 [2022-04-06 17:03:51,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:51,827 INFO L225 Difference]: With dead ends: 68 [2022-04-06 17:03:51,827 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 17:03:51,827 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 79 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:03:51,828 INFO L913 BasicCegarLoop]: 42 mSDtfsCounter, 12 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 151 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:51,828 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 151 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:03:51,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 17:03:51,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-04-06 17:03:51,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 38 states have internal predecessors, (43), 20 states have call successors, (20), 8 states have call predecessors, (20), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-04-06 17:03:51,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 80 transitions. [2022-04-06 17:03:51,849 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 80 transitions. Word has length 45 [2022-04-06 17:03:51,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:51,849 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 80 transitions. [2022-04-06 17:03:51,849 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:03:51,849 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 80 transitions. [2022-04-06 17:03:51,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-04-06 17:03:51,850 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:51,850 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:51,867 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:52,050 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:52,051 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:52,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:52,051 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 1 times [2022-04-06 17:03:52,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:52,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1031489221] [2022-04-06 17:03:52,052 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:52,052 INFO L85 PathProgramCache]: Analyzing trace with hash -1471734606, now seen corresponding path program 2 times [2022-04-06 17:03:52,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:52,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204463672] [2022-04-06 17:03:52,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:52,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:52,061 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:52,061 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [881833353] [2022-04-06 17:03:52,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:52,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:52,061 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:52,069 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:52,070 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 17:03:52,105 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:52,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:52,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 18 conjunts are in the unsatisfiable core [2022-04-06 17:03:52,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:52,302 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 4 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-04-06 17:03:52,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:03:52,428 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-04-06 17:03:52,428 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:52,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204463672] [2022-04-06 17:03:52,428 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:52,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881833353] [2022-04-06 17:03:52,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881833353] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 17:03:52,428 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:03:52,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 10 [2022-04-06 17:03:52,429 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:52,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1031489221] [2022-04-06 17:03:52,429 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1031489221] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:52,429 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:52,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:03:52,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61772606] [2022-04-06 17:03:52,429 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:52,430 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:03:52,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:52,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:03:52,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-04-06 17:03:52,430 INFO L87 Difference]: Start difference. First operand 64 states and 80 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:03:52,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:52,487 INFO L93 Difference]: Finished difference Result 76 states and 95 transitions. [2022-04-06 17:03:52,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:03:52,487 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 55 [2022-04-06 17:03:52,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:52,488 INFO L225 Difference]: With dead ends: 76 [2022-04-06 17:03:52,488 INFO L226 Difference]: Without dead ends: 74 [2022-04-06 17:03:52,488 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-04-06 17:03:52,489 INFO L913 BasicCegarLoop]: 41 mSDtfsCounter, 8 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:52,489 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 129 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:03:52,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-04-06 17:03:52,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2022-04-06 17:03:52,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.175) internal successors, (47), 43 states have internal predecessors, (47), 22 states have call successors, (22), 9 states have call predecessors, (22), 8 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-04-06 17:03:52,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 88 transitions. [2022-04-06 17:03:52,500 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 88 transitions. Word has length 55 [2022-04-06 17:03:52,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:52,501 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 88 transitions. [2022-04-06 17:03:52,501 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-04-06 17:03:52,501 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 88 transitions. [2022-04-06 17:03:52,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 17:03:52,502 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:52,502 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:52,528 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:52,717 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:52,717 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:52,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:52,718 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 1 times [2022-04-06 17:03:52,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:52,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [284620503] [2022-04-06 17:03:52,718 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:52,719 INFO L85 PathProgramCache]: Analyzing trace with hash -682689219, now seen corresponding path program 2 times [2022-04-06 17:03:52,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:52,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029602535] [2022-04-06 17:03:52,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:52,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:52,726 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:52,726 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1477124507] [2022-04-06 17:03:52,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:52,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:52,727 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:52,727 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:52,770 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 17:03:52,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:52,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:52,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 17:03:52,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:52,895 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-04-06 17:03:52,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 17:03:52,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:52,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1029602535] [2022-04-06 17:03:52,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:52,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477124507] [2022-04-06 17:03:52,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477124507] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:52,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:52,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:03:52,896 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:52,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [284620503] [2022-04-06 17:03:52,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [284620503] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:52,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:52,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 17:03:52,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690473301] [2022-04-06 17:03:52,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:52,897 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 17:03:52,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:52,897 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 17:03:52,897 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 17:03:52,897 INFO L87 Difference]: Start difference. First operand 71 states and 88 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-04-06 17:03:52,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:52,948 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2022-04-06 17:03:52,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 17:03:52,948 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 56 [2022-04-06 17:03:52,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:52,950 INFO L225 Difference]: With dead ends: 79 [2022-04-06 17:03:52,950 INFO L226 Difference]: Without dead ends: 72 [2022-04-06 17:03:52,950 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:03:52,951 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 8 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:52,951 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 123 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 17:03:52,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-04-06 17:03:52,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2022-04-06 17:03:52,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 41 states have (on average 1.146341463414634) internal successors, (47), 44 states have internal predecessors, (47), 20 states have call successors, (20), 10 states have call predecessors, (20), 9 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2022-04-06 17:03:52,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 85 transitions. [2022-04-06 17:03:52,960 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 85 transitions. Word has length 56 [2022-04-06 17:03:52,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:52,960 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 85 transitions. [2022-04-06 17:03:52,960 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2022-04-06 17:03:52,960 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 85 transitions. [2022-04-06 17:03:52,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-04-06 17:03:52,961 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:52,961 INFO L499 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:52,979 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:53,177 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:53,177 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:53,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:53,178 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 1 times [2022-04-06 17:03:53,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:53,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1144935053] [2022-04-06 17:03:53,178 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:53,178 INFO L85 PathProgramCache]: Analyzing trace with hash 680531353, now seen corresponding path program 2 times [2022-04-06 17:03:53,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:53,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531705476] [2022-04-06 17:03:53,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:53,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:53,186 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:53,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [849347075] [2022-04-06 17:03:53,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:53,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:53,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:53,187 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:53,188 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 17:03:53,243 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:53,243 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:53,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 17:03:53,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:53,810 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-04-06 17:03:53,810 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:03:54,913 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-04-06 17:03:54,914 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:54,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531705476] [2022-04-06 17:03:54,914 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:54,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849347075] [2022-04-06 17:03:54,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849347075] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:03:54,914 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:03:54,914 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-04-06 17:03:54,915 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:54,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1144935053] [2022-04-06 17:03:54,915 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1144935053] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:54,915 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:54,915 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:03:54,915 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513139754] [2022-04-06 17:03:54,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:54,916 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:03:54,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:54,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:03:54,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:03:54,917 INFO L87 Difference]: Start difference. First operand 71 states and 85 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:03:55,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:55,167 INFO L93 Difference]: Finished difference Result 135 states and 165 transitions. [2022-04-06 17:03:55,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:03:55,167 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2022-04-06 17:03:55,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:55,169 INFO L225 Difference]: With dead ends: 135 [2022-04-06 17:03:55,169 INFO L226 Difference]: Without dead ends: 108 [2022-04-06 17:03:55,169 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-04-06 17:03:55,170 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 10 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:55,170 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 234 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-06 17:03:55,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-04-06 17:03:55,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2022-04-06 17:03:55,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 64 states have (on average 1.140625) internal successors, (73), 67 states have internal predecessors, (73), 27 states have call successors, (27), 15 states have call predecessors, (27), 14 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 17:03:55,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 125 transitions. [2022-04-06 17:03:55,183 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 125 transitions. Word has length 75 [2022-04-06 17:03:55,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:55,183 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 125 transitions. [2022-04-06 17:03:55,183 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:03:55,183 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 125 transitions. [2022-04-06 17:03:55,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-04-06 17:03:55,184 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:55,184 INFO L499 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:55,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:55,420 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:55,420 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:55,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:55,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 3 times [2022-04-06 17:03:55,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:55,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1355668131] [2022-04-06 17:03:55,421 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:55,421 INFO L85 PathProgramCache]: Analyzing trace with hash -1566820819, now seen corresponding path program 4 times [2022-04-06 17:03:55,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:55,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008736786] [2022-04-06 17:03:55,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:55,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:55,428 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:55,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1339931999] [2022-04-06 17:03:55,429 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:03:55,429 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:55,429 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:55,430 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:55,431 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 17:03:55,469 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:03:55,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:55,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-06 17:03:55,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:55,648 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-04-06 17:03:55,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:03:57,496 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2022-04-06 17:03:57,497 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:03:57,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2008736786] [2022-04-06 17:03:57,497 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:03:57,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339931999] [2022-04-06 17:03:57,497 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339931999] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:03:57,497 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:03:57,497 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2022-04-06 17:03:57,497 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:03:57,498 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1355668131] [2022-04-06 17:03:57,498 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1355668131] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:03:57,498 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:03:57,498 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 17:03:57,498 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373827515] [2022-04-06 17:03:57,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:03:57,498 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 17:03:57,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:57,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 17:03:57,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-04-06 17:03:57,499 INFO L87 Difference]: Start difference. First operand 106 states and 125 transitions. Second operand has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-04-06 17:03:57,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:03:57,672 INFO L93 Difference]: Finished difference Result 133 states and 159 transitions. [2022-04-06 17:03:57,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 17:03:57,672 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 80 [2022-04-06 17:03:57,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:03:57,673 INFO L225 Difference]: With dead ends: 133 [2022-04-06 17:03:57,673 INFO L226 Difference]: Without dead ends: 110 [2022-04-06 17:03:57,674 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:03:57,674 INFO L913 BasicCegarLoop]: 53 mSDtfsCounter, 11 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:03:57,674 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 222 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:03:57,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-04-06 17:03:57,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2022-04-06 17:03:57,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 66 states have (on average 1.106060606060606) internal successors, (73), 70 states have internal predecessors, (73), 28 states have call successors, (28), 16 states have call predecessors, (28), 15 states have return successors, (25), 23 states have call predecessors, (25), 25 states have call successors, (25) [2022-04-06 17:03:57,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 126 transitions. [2022-04-06 17:03:57,684 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 126 transitions. Word has length 80 [2022-04-06 17:03:57,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:03:57,685 INFO L478 AbstractCegarLoop]: Abstraction has 110 states and 126 transitions. [2022-04-06 17:03:57,685 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.75) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2022-04-06 17:03:57,685 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 126 transitions. [2022-04-06 17:03:57,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-04-06 17:03:57,686 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:03:57,686 INFO L499 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:03:57,721 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 17:03:57,886 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:57,886 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:03:57,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:03:57,887 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 1 times [2022-04-06 17:03:57,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:03:57,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [332041847] [2022-04-06 17:03:57,887 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:03:57,887 INFO L85 PathProgramCache]: Analyzing trace with hash -815356955, now seen corresponding path program 2 times [2022-04-06 17:03:57,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:03:57,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96334792] [2022-04-06 17:03:57,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:03:57,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:03:57,894 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:03:57,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [293385608] [2022-04-06 17:03:57,894 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:03:57,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:03:57,894 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:03:57,896 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:03:57,897 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 17:03:57,936 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:03:57,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:03:57,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 31 conjunts are in the unsatisfiable core [2022-04-06 17:03:57,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:03:58,911 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-04-06 17:03:58,912 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:04:12,030 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 45 proven. 32 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2022-04-06 17:04:12,031 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:04:12,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96334792] [2022-04-06 17:04:12,031 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:04:12,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [293385608] [2022-04-06 17:04:12,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [293385608] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:04:12,031 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:04:12,031 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2022-04-06 17:04:12,031 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:04:12,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [332041847] [2022-04-06 17:04:12,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [332041847] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:04:12,032 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:04:12,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-04-06 17:04:12,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879036440] [2022-04-06 17:04:12,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:04:12,032 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-04-06 17:04:12,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:04:12,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-04-06 17:04:12,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2022-04-06 17:04:12,033 INFO L87 Difference]: Start difference. First operand 110 states and 126 transitions. Second operand has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:04:13,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:04:13,218 INFO L93 Difference]: Finished difference Result 116 states and 131 transitions. [2022-04-06 17:04:13,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 17:04:13,219 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 86 [2022-04-06 17:04:13,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:04:13,220 INFO L225 Difference]: With dead ends: 116 [2022-04-06 17:04:13,220 INFO L226 Difference]: Without dead ends: 88 [2022-04-06 17:04:13,220 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=135, Invalid=567, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:04:13,220 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 17 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 416 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 416 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 17:04:13,221 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 230 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 416 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 17:04:13,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-04-06 17:04:13,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-04-06 17:04:13,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 55 states have internal predecessors, (58), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (21), 19 states have call predecessors, (21), 21 states have call successors, (21) [2022-04-06 17:04:13,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2022-04-06 17:04:13,228 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 86 [2022-04-06 17:04:13,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:04:13,228 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2022-04-06 17:04:13,228 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2022-04-06 17:04:13,228 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2022-04-06 17:04:13,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-04-06 17:04:13,229 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:04:13,229 INFO L499 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:04:13,246 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-06 17:04:13,446 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:04:13,446 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:04:13,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:04:13,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 5 times [2022-04-06 17:04:13,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:04:13,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [365728635] [2022-04-06 17:04:13,447 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:04:13,447 INFO L85 PathProgramCache]: Analyzing trace with hash 1885636697, now seen corresponding path program 6 times [2022-04-06 17:04:13,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:04:13,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011974611] [2022-04-06 17:04:13,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:04:13,447 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:04:13,453 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:04:13,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1279814508] [2022-04-06 17:04:13,453 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:04:13,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:04:13,453 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:04:13,456 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:04:13,457 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 17:04:13,496 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 17:04:13,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:04:13,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 26 conjunts are in the unsatisfiable core [2022-04-06 17:04:13,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:04:26,085 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:04:28,413 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 55 proven. 9 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-04-06 17:04:28,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:05:16,439 WARN L232 SmtUtils]: Spent 27.43s on a formula simplification that was a NOOP. DAG size: 51 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:06:20,233 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 45 proven. 19 refuted. 0 times theorem prover too weak. 207 trivial. 0 not checked. [2022-04-06 17:06:20,233 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:20,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011974611] [2022-04-06 17:06:20,234 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:20,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279814508] [2022-04-06 17:06:20,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279814508] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:06:20,234 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:06:20,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 15 [2022-04-06 17:06:20,234 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:20,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [365728635] [2022-04-06 17:06:20,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [365728635] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:20,234 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:20,234 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:06:20,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479434183] [2022-04-06 17:06:20,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:20,235 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:06:20,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:20,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:06:20,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=162, Unknown=2, NotChecked=0, Total=210 [2022-04-06 17:06:20,235 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:06:22,274 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-04-06 17:06:24,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:24,851 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-04-06 17:06:24,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 17:06:24,852 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 92 [2022-04-06 17:06:24,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:24,853 INFO L225 Difference]: With dead ends: 112 [2022-04-06 17:06:24,853 INFO L226 Difference]: Without dead ends: 100 [2022-04-06 17:06:24,853 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=59, Invalid=210, Unknown=3, NotChecked=0, Total=272 [2022-04-06 17:06:24,853 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 25 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 24 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 304 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:24,854 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 190 Invalid, 304 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 279 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2022-04-06 17:06:24,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-04-06 17:06:24,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2022-04-06 17:06:24,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 59 states have (on average 1.11864406779661) internal successors, (66), 63 states have internal predecessors, (66), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24) [2022-04-06 17:06:24,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 116 transitions. [2022-04-06 17:06:24,861 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 116 transitions. Word has length 92 [2022-04-06 17:06:24,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:24,861 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 116 transitions. [2022-04-06 17:06:24,861 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2022-04-06 17:06:24,862 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 116 transitions. [2022-04-06 17:06:24,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-04-06 17:06:24,862 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:24,862 INFO L499 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:24,882 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 17:06:25,082 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-06 17:06:25,082 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:25,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:25,083 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 7 times [2022-04-06 17:06:25,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:25,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [187182336] [2022-04-06 17:06:25,083 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:25,084 INFO L85 PathProgramCache]: Analyzing trace with hash -278824083, now seen corresponding path program 8 times [2022-04-06 17:06:25,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:25,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137190935] [2022-04-06 17:06:25,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:25,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:25,090 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:25,090 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2017868622] [2022-04-06 17:06:25,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:06:25,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:25,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:25,092 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:06:25,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 17:06:25,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:06:25,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:25,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 23 conjunts are in the unsatisfiable core [2022-04-06 17:06:25,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:25,543 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-04-06 17:06:25,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:06:27,847 INFO L134 CoverageAnalysis]: Checked inductivity of 318 backedges. 24 proven. 18 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2022-04-06 17:06:27,847 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:06:27,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137190935] [2022-04-06 17:06:27,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:06:27,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017868622] [2022-04-06 17:06:27,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017868622] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:06:27,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:06:27,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2022-04-06 17:06:27,848 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:06:27,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [187182336] [2022-04-06 17:06:27,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [187182336] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:06:27,848 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:06:27,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 17:06:27,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415476423] [2022-04-06 17:06:27,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:06:27,849 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 17:06:27,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:27,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 17:06:27,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-04-06 17:06:27,849 INFO L87 Difference]: Start difference. First operand 99 states and 116 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-04-06 17:06:28,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:06:28,191 INFO L93 Difference]: Finished difference Result 177 states and 223 transitions. [2022-04-06 17:06:28,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 17:06:28,192 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 97 [2022-04-06 17:06:28,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:06:28,193 INFO L225 Difference]: With dead ends: 177 [2022-04-06 17:06:28,193 INFO L226 Difference]: Without dead ends: 138 [2022-04-06 17:06:28,193 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 180 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2022-04-06 17:06:28,194 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 13 mSDsluCounter, 244 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:06:28,194 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 306 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:06:28,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2022-04-06 17:06:28,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2022-04-06 17:06:28,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 82 states have (on average 1.1219512195121952) internal successors, (92), 88 states have internal predecessors, (92), 39 states have call successors, (39), 17 states have call predecessors, (39), 16 states have return successors, (36), 32 states have call predecessors, (36), 36 states have call successors, (36) [2022-04-06 17:06:28,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 167 transitions. [2022-04-06 17:06:28,206 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 167 transitions. Word has length 97 [2022-04-06 17:06:28,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:06:28,206 INFO L478 AbstractCegarLoop]: Abstraction has 138 states and 167 transitions. [2022-04-06 17:06:28,206 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 6 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2022-04-06 17:06:28,206 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 167 transitions. [2022-04-06 17:06:28,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-04-06 17:06:28,208 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:06:28,208 INFO L499 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:06:28,227 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 17:06:28,425 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:28,426 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:06:28,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:06:28,426 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 9 times [2022-04-06 17:06:28,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:06:28,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1220265009] [2022-04-06 17:06:28,426 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:06:28,427 INFO L85 PathProgramCache]: Analyzing trace with hash -367001023, now seen corresponding path program 10 times [2022-04-06 17:06:28,427 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:06:28,427 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734366763] [2022-04-06 17:06:28,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:06:28,427 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:06:28,441 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:06:28,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1270424662] [2022-04-06 17:06:28,441 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:06:28,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:06:28,442 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:06:28,442 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:06:28,463 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 17:06:28,491 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:06:28,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:06:28,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 42 conjunts are in the unsatisfiable core [2022-04-06 17:06:28,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:06:29,768 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-04-06 17:06:29,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:07:11,087 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 58 proven. 28 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2022-04-06 17:07:11,088 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:07:11,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734366763] [2022-04-06 17:07:11,088 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:07:11,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270424662] [2022-04-06 17:07:11,088 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270424662] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:07:11,088 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:07:11,088 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2022-04-06 17:07:11,088 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:07:11,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1220265009] [2022-04-06 17:07:11,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1220265009] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:07:11,089 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:07:11,089 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:07:11,089 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602700358] [2022-04-06 17:07:11,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:07:11,089 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:07:11,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:11,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:07:11,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2022-04-06 17:07:11,090 INFO L87 Difference]: Start difference. First operand 138 states and 167 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-04-06 17:07:12,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:07:12,844 INFO L93 Difference]: Finished difference Result 184 states and 208 transitions. [2022-04-06 17:07:12,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:07:12,844 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 105 [2022-04-06 17:07:12,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:07:12,846 INFO L225 Difference]: With dead ends: 184 [2022-04-06 17:07:12,846 INFO L226 Difference]: Without dead ends: 147 [2022-04-06 17:07:12,847 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 13.5s TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:07:12,849 INFO L913 BasicCegarLoop]: 47 mSDtfsCounter, 17 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 716 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 733 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 716 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-04-06 17:07:12,849 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 308 Invalid, 733 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 716 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-04-06 17:07:12,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2022-04-06 17:07:12,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2022-04-06 17:07:12,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 90 states have (on average 1.0888888888888888) internal successors, (98), 95 states have internal predecessors, (98), 36 states have call successors, (36), 21 states have call predecessors, (36), 20 states have return successors, (33), 30 states have call predecessors, (33), 33 states have call successors, (33) [2022-04-06 17:07:12,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 167 transitions. [2022-04-06 17:07:12,879 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 167 transitions. Word has length 105 [2022-04-06 17:07:12,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:07:12,880 INFO L478 AbstractCegarLoop]: Abstraction has 147 states and 167 transitions. [2022-04-06 17:07:12,880 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 8 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2022-04-06 17:07:12,880 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 167 transitions. [2022-04-06 17:07:12,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-04-06 17:07:12,883 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:07:12,883 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:07:12,900 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-04-06 17:07:13,092 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 17:07:13,092 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:07:13,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:07:13,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 11 times [2022-04-06 17:07:13,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:13,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1209092122] [2022-04-06 17:07:13,093 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:07:13,093 INFO L85 PathProgramCache]: Analyzing trace with hash -1683530195, now seen corresponding path program 12 times [2022-04-06 17:07:13,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:07:13,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369204670] [2022-04-06 17:07:13,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:07:13,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:07:13,098 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:07:13,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1049785094] [2022-04-06 17:07:13,099 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:07:13,099 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:13,099 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:07:13,111 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:07:13,111 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 17:07:13,174 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 17:07:13,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:07:13,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 22 conjunts are in the unsatisfiable core [2022-04-06 17:07:13,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:07:13,539 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 96 proven. 4 refuted. 0 times theorem prover too weak. 395 trivial. 0 not checked. [2022-04-06 17:07:13,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:07:13,866 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:07:13,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369204670] [2022-04-06 17:07:13,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:07:13,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049785094] [2022-04-06 17:07:13,867 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049785094] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 17:07:13,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:07:13,867 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2022-04-06 17:07:13,867 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:07:13,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1209092122] [2022-04-06 17:07:13,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1209092122] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:07:13,868 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:07:13,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 17:07:13,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080871219] [2022-04-06 17:07:13,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:07:13,872 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 17:07:13,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:13,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 17:07:13,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-04-06 17:07:13,873 INFO L87 Difference]: Start difference. First operand 147 states and 167 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-04-06 17:07:14,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:07:14,355 INFO L93 Difference]: Finished difference Result 168 states and 190 transitions. [2022-04-06 17:07:14,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 17:07:14,356 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 114 [2022-04-06 17:07:14,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:07:14,357 INFO L225 Difference]: With dead ends: 168 [2022-04-06 17:07:14,357 INFO L226 Difference]: Without dead ends: 156 [2022-04-06 17:07:14,357 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-04-06 17:07:14,357 INFO L913 BasicCegarLoop]: 43 mSDtfsCounter, 20 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 273 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 273 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 17:07:14,357 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 207 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 273 Invalid, 0 Unknown, 62 Unchecked, 0.4s Time] [2022-04-06 17:07:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-04-06 17:07:14,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2022-04-06 17:07:14,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 95 states have (on average 1.0842105263157895) internal successors, (103), 100 states have internal predecessors, (103), 38 states have call successors, (38), 22 states have call predecessors, (38), 21 states have return successors, (35), 32 states have call predecessors, (35), 35 states have call successors, (35) [2022-04-06 17:07:14,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 176 transitions. [2022-04-06 17:07:14,371 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 176 transitions. Word has length 114 [2022-04-06 17:07:14,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:07:14,371 INFO L478 AbstractCegarLoop]: Abstraction has 155 states and 176 transitions. [2022-04-06 17:07:14,371 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-04-06 17:07:14,372 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 176 transitions. [2022-04-06 17:07:14,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-04-06 17:07:14,372 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:07:14,372 INFO L499 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:07:14,388 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-04-06 17:07:14,588 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 17:07:14,588 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:07:14,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:07:14,588 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 3 times [2022-04-06 17:07:14,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:14,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1357279578] [2022-04-06 17:07:14,589 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:07:14,589 INFO L85 PathProgramCache]: Analyzing trace with hash -1619018179, now seen corresponding path program 4 times [2022-04-06 17:07:14,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:07:14,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1776624462] [2022-04-06 17:07:14,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:07:14,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:07:14,597 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:07:14,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1310284356] [2022-04-06 17:07:14,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:07:14,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:14,598 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:07:14,603 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:07:14,604 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 17:07:14,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:07:14,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:07:14,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 43 conjunts are in the unsatisfiable core [2022-04-06 17:07:14,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:07:15,397 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:07:16,428 INFO L134 CoverageAnalysis]: Checked inductivity of 490 backedges. 71 proven. 29 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2022-04-06 17:07:16,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:07:16,540 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-04-06 17:07:25,766 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:07:25,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1776624462] [2022-04-06 17:07:25,766 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:07:25,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310284356] [2022-04-06 17:07:25,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310284356] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 17:07:25,767 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 17:07:25,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-04-06 17:07:25,767 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:07:25,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1357279578] [2022-04-06 17:07:25,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1357279578] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:07:25,767 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:07:25,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-04-06 17:07:25,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629413669] [2022-04-06 17:07:25,767 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:07:25,767 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-04-06 17:07:25,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:25,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-04-06 17:07:25,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=549, Unknown=0, NotChecked=0, Total=702 [2022-04-06 17:07:25,768 INFO L87 Difference]: Start difference. First operand 155 states and 176 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-04-06 17:07:27,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:07:27,406 INFO L93 Difference]: Finished difference Result 161 states and 181 transitions. [2022-04-06 17:07:27,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 17:07:27,407 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) Word has length 116 [2022-04-06 17:07:27,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:07:27,414 INFO L225 Difference]: With dead ends: 161 [2022-04-06 17:07:27,414 INFO L226 Difference]: Without dead ends: 124 [2022-04-06 17:07:27,416 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2022-04-06 17:07:27,417 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 15 mSDsluCounter, 261 mSDsCounter, 0 mSdLazyCounter, 539 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 615 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 539 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-04-06 17:07:27,417 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 305 Invalid, 615 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 539 Invalid, 0 Unknown, 62 Unchecked, 1.4s Time] [2022-04-06 17:07:27,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-04-06 17:07:27,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2022-04-06 17:07:27,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 75 states have (on average 1.0933333333333333) internal successors, (82), 79 states have internal predecessors, (82), 31 states have call successors, (31), 18 states have call predecessors, (31), 17 states have return successors, (29), 26 states have call predecessors, (29), 29 states have call successors, (29) [2022-04-06 17:07:27,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 142 transitions. [2022-04-06 17:07:27,447 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 142 transitions. Word has length 116 [2022-04-06 17:07:27,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:07:27,447 INFO L478 AbstractCegarLoop]: Abstraction has 124 states and 142 transitions. [2022-04-06 17:07:27,447 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 8 states have call successors, (21), 2 states have call predecessors, (21), 2 states have return successors, (19), 7 states have call predecessors, (19), 7 states have call successors, (19) [2022-04-06 17:07:27,447 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 142 transitions. [2022-04-06 17:07:27,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-04-06 17:07:27,448 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:07:27,448 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:07:27,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 17:07:27,667 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-04-06 17:07:27,667 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:07:27,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:07:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 5 times [2022-04-06 17:07:27,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:27,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [919487152] [2022-04-06 17:07:27,668 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:07:27,668 INFO L85 PathProgramCache]: Analyzing trace with hash -1921791003, now seen corresponding path program 6 times [2022-04-06 17:07:27,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:07:27,668 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1852837192] [2022-04-06 17:07:27,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:07:27,668 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:07:27,674 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:07:27,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1331929163] [2022-04-06 17:07:27,674 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:07:27,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:27,674 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:07:27,677 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:07:27,678 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 17:07:27,744 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-04-06 17:07:27,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:07:27,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 6 conjunts are in the unsatisfiable core [2022-04-06 17:07:27,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:07:28,060 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-04-06 17:07:28,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:07:28,290 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 57 proven. 4 refuted. 0 times theorem prover too weak. 497 trivial. 0 not checked. [2022-04-06 17:07:28,290 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:07:28,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1852837192] [2022-04-06 17:07:28,291 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:07:28,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331929163] [2022-04-06 17:07:28,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331929163] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:07:28,291 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:07:28,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2022-04-06 17:07:28,291 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:07:28,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [919487152] [2022-04-06 17:07:28,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [919487152] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:07:28,291 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:07:28,291 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 17:07:28,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372218899] [2022-04-06 17:07:28,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:07:28,292 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 17:07:28,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:28,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 17:07:28,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:07:28,292 INFO L87 Difference]: Start difference. First operand 124 states and 142 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-04-06 17:07:28,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:07:28,376 INFO L93 Difference]: Finished difference Result 150 states and 178 transitions. [2022-04-06 17:07:28,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 17:07:28,376 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) Word has length 120 [2022-04-06 17:07:28,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:07:28,377 INFO L225 Difference]: With dead ends: 150 [2022-04-06 17:07:28,377 INFO L226 Difference]: Without dead ends: 137 [2022-04-06 17:07:28,377 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 230 SyntacticMatches, 5 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2022-04-06 17:07:28,378 INFO L913 BasicCegarLoop]: 66 mSDtfsCounter, 18 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 17:07:28,378 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 138 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 17:07:28,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-04-06 17:07:28,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2022-04-06 17:07:28,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 83 states have (on average 1.108433734939759) internal successors, (92), 87 states have internal predecessors, (92), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (34), 31 states have call predecessors, (34), 34 states have call successors, (34) [2022-04-06 17:07:28,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 162 transitions. [2022-04-06 17:07:28,389 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 162 transitions. Word has length 120 [2022-04-06 17:07:28,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:07:28,389 INFO L478 AbstractCegarLoop]: Abstraction has 137 states and 162 transitions. [2022-04-06 17:07:28,389 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 5 states have call predecessors, (20), 5 states have call successors, (20) [2022-04-06 17:07:28,389 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 162 transitions. [2022-04-06 17:07:28,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-04-06 17:07:28,390 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:07:28,390 INFO L499 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:07:28,419 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-04-06 17:07:28,605 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-04-06 17:07:28,606 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:07:28,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:07:28,606 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 13 times [2022-04-06 17:07:28,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:07:28,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1653874875] [2022-04-06 17:07:28,607 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:07:28,607 INFO L85 PathProgramCache]: Analyzing trace with hash 515319041, now seen corresponding path program 14 times [2022-04-06 17:07:28,607 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:07:28,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807297663] [2022-04-06 17:07:28,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:07:28,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:07:28,615 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:07:28,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1471002093] [2022-04-06 17:07:28,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:07:28,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:07:28,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:07:28,616 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:07:28,617 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-04-06 17:07:28,668 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:07:28,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:07:28,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 41 conjunts are in the unsatisfiable core [2022-04-06 17:07:28,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:07:29,402 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-04-06 17:07:29,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:08:04,176 WARN L232 SmtUtils]: Spent 9.59s on a formula simplification that was a NOOP. DAG size: 142 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:08:40,229 INFO L134 CoverageAnalysis]: Checked inductivity of 563 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2022-04-06 17:08:40,229 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:08:40,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807297663] [2022-04-06 17:08:40,229 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:08:40,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1471002093] [2022-04-06 17:08:40,229 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1471002093] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:08:40,229 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:08:40,229 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2022-04-06 17:08:40,230 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:08:40,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1653874875] [2022-04-06 17:08:40,230 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1653874875] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:08:40,230 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:08:40,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 17:08:40,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813648374] [2022-04-06 17:08:40,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:08:40,230 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 17:08:40,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:40,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 17:08:40,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2022-04-06 17:08:40,231 INFO L87 Difference]: Start difference. First operand 137 states and 162 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-04-06 17:08:41,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:08:41,064 INFO L93 Difference]: Finished difference Result 241 states and 293 transitions. [2022-04-06 17:08:41,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 17:08:41,064 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) Word has length 122 [2022-04-06 17:08:41,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:08:41,065 INFO L225 Difference]: With dead ends: 241 [2022-04-06 17:08:41,066 INFO L226 Difference]: Without dead ends: 195 [2022-04-06 17:08:41,066 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 222 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2022-04-06 17:08:41,066 INFO L913 BasicCegarLoop]: 62 mSDtfsCounter, 12 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 583 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 333 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-06 17:08:41,067 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 333 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 583 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-06 17:08:41,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-04-06 17:08:41,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 192. [2022-04-06 17:08:41,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 192 states, 118 states have (on average 1.1101694915254237) internal successors, (131), 123 states have internal predecessors, (131), 49 states have call successors, (49), 25 states have call predecessors, (49), 24 states have return successors, (47), 43 states have call predecessors, (47), 47 states have call successors, (47) [2022-04-06 17:08:41,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 227 transitions. [2022-04-06 17:08:41,082 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 227 transitions. Word has length 122 [2022-04-06 17:08:41,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:08:41,082 INFO L478 AbstractCegarLoop]: Abstraction has 192 states and 227 transitions. [2022-04-06 17:08:41,082 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (22), 2 states have call predecessors, (22), 1 states have return successors, (20), 7 states have call predecessors, (20), 7 states have call successors, (20) [2022-04-06 17:08:41,083 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 227 transitions. [2022-04-06 17:08:41,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2022-04-06 17:08:41,088 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:08:41,088 INFO L499 BasicCegarLoop]: trace histogram [18, 17, 17, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:08:41,107 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-04-06 17:08:41,303 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:08:41,303 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:08:41,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:08:41,304 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 15 times [2022-04-06 17:08:41,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:41,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [496759184] [2022-04-06 17:08:41,305 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:08:41,305 INFO L85 PathProgramCache]: Analyzing trace with hash -1224833083, now seen corresponding path program 16 times [2022-04-06 17:08:41,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:08:41,305 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51884259] [2022-04-06 17:08:41,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:08:41,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:08:41,312 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:08:41,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [686912346] [2022-04-06 17:08:41,312 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 17:08:41,312 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:08:41,312 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:08:41,313 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:08:41,314 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-04-06 17:08:41,367 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 17:08:41,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:08:41,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 32 conjunts are in the unsatisfiable core [2022-04-06 17:08:41,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:08:41,797 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-04-06 17:08:41,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:08:58,900 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 34 proven. 41 refuted. 0 times theorem prover too weak. 556 trivial. 0 not checked. [2022-04-06 17:08:58,901 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:08:58,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51884259] [2022-04-06 17:08:58,901 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:08:58,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686912346] [2022-04-06 17:08:58,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [686912346] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:08:58,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:08:58,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2022-04-06 17:08:58,901 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:08:58,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [496759184] [2022-04-06 17:08:58,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [496759184] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:08:58,901 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:08:58,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-04-06 17:08:58,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785393742] [2022-04-06 17:08:58,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:08:58,902 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-04-06 17:08:58,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:58,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-04-06 17:08:58,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=251, Unknown=0, NotChecked=0, Total=342 [2022-04-06 17:08:58,902 INFO L87 Difference]: Start difference. First operand 192 states and 227 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:08:59,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:08:59,267 INFO L93 Difference]: Finished difference Result 238 states and 285 transitions. [2022-04-06 17:08:59,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-04-06 17:08:59,268 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 127 [2022-04-06 17:08:59,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:08:59,269 INFO L225 Difference]: With dead ends: 238 [2022-04-06 17:08:59,269 INFO L226 Difference]: Without dead ends: 209 [2022-04-06 17:08:59,269 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 235 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2022-04-06 17:08:59,269 INFO L913 BasicCegarLoop]: 72 mSDtfsCounter, 12 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 432 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 17:08:59,269 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 384 Invalid, 446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 432 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 17:08:59,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-04-06 17:08:59,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 207. [2022-04-06 17:08:59,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 128 states have (on average 1.1015625) internal successors, (141), 135 states have internal predecessors, (141), 52 states have call successors, (52), 27 states have call predecessors, (52), 26 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-04-06 17:08:59,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 242 transitions. [2022-04-06 17:08:59,286 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 242 transitions. Word has length 127 [2022-04-06 17:08:59,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:08:59,286 INFO L478 AbstractCegarLoop]: Abstraction has 207 states and 242 transitions. [2022-04-06 17:08:59,286 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), 8 states have call successors, (23), 2 states have call predecessors, (23), 1 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2022-04-06 17:08:59,286 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 242 transitions. [2022-04-06 17:08:59,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-04-06 17:08:59,287 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:08:59,287 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:08:59,313 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-04-06 17:08:59,503 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-04-06 17:08:59,504 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:08:59,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:08:59,504 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 17 times [2022-04-06 17:08:59,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:08:59,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [219084186] [2022-04-06 17:08:59,504 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:08:59,505 INFO L85 PathProgramCache]: Analyzing trace with hash -243845479, now seen corresponding path program 18 times [2022-04-06 17:08:59,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:08:59,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345990152] [2022-04-06 17:08:59,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:08:59,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:08:59,511 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:08:59,511 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [271817082] [2022-04-06 17:08:59,512 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 17:08:59,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:08:59,512 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:08:59,512 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:08:59,513 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-04-06 17:08:59,798 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-04-06 17:08:59,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:08:59,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 58 conjunts are in the unsatisfiable core [2022-04-06 17:08:59,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:09:00,876 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 42 proven. 51 refuted. 0 times theorem prover too weak. 618 trivial. 0 not checked. [2022-04-06 17:09:00,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:10:13,562 WARN L232 SmtUtils]: Spent 22.17s on a formula simplification that was a NOOP. DAG size: 438 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:13:00,632 WARN L232 SmtUtils]: Spent 1.10m on a formula simplification that was a NOOP. DAG size: 440 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-04-06 17:16:37,395 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2022-04-06 17:16:37,396 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 17:16:37,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345990152] [2022-04-06 17:16:37,396 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 17:16:37,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271817082] [2022-04-06 17:16:37,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271817082] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 17:16:37,396 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-04-06 17:16:37,396 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 29 [2022-04-06 17:16:37,396 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 17:16:37,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [219084186] [2022-04-06 17:16:37,397 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [219084186] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 17:16:37,397 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 17:16:37,397 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-04-06 17:16:37,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283007314] [2022-04-06 17:16:37,397 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 17:16:37,397 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-06 17:16:37,397 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 17:16:37,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-06 17:16:37,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=635, Unknown=0, NotChecked=0, Total=812 [2022-04-06 17:16:37,398 INFO L87 Difference]: Start difference. First operand 207 states and 242 transitions. Second operand has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 9 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) [2022-04-06 17:16:39,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 17:16:39,798 INFO L93 Difference]: Finished difference Result 225 states and 261 transitions. [2022-04-06 17:16:39,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-04-06 17:16:39,799 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 9 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) Word has length 135 [2022-04-06 17:16:39,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 17:16:39,800 INFO L225 Difference]: With dead ends: 225 [2022-04-06 17:16:39,800 INFO L226 Difference]: Without dead ends: 218 [2022-04-06 17:16:39,801 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 241 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 115.0s TimeCoverageRelationStatistics Valid=185, Invalid=745, Unknown=0, NotChecked=0, Total=930 [2022-04-06 17:16:39,801 INFO L913 BasicCegarLoop]: 60 mSDtfsCounter, 34 mSDsluCounter, 234 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-04-06 17:16:39,802 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 294 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 842 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-04-06 17:16:39,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2022-04-06 17:16:39,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 215. [2022-04-06 17:16:39,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 141 states have internal predecessors, (146), 52 states have call successors, (52), 29 states have call predecessors, (52), 28 states have return successors, (49), 44 states have call predecessors, (49), 49 states have call successors, (49) [2022-04-06 17:16:39,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 247 transitions. [2022-04-06 17:16:39,828 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 247 transitions. Word has length 135 [2022-04-06 17:16:39,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 17:16:39,829 INFO L478 AbstractCegarLoop]: Abstraction has 215 states and 247 transitions. [2022-04-06 17:16:39,829 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.9444444444444444) internal successors, (35), 16 states have internal predecessors, (35), 9 states have call successors, (24), 2 states have call predecessors, (24), 2 states have return successors, (22), 9 states have call predecessors, (22), 8 states have call successors, (22) [2022-04-06 17:16:39,829 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 247 transitions. [2022-04-06 17:16:39,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2022-04-06 17:16:39,831 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 17:16:39,831 INFO L499 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 17:16:39,836 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-04-06 17:16:40,039 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:16:40,039 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 17:16:40,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 17:16:40,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1932789221, now seen corresponding path program 1 times [2022-04-06 17:16:40,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 17:16:40,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1176157962] [2022-04-06 17:16:40,041 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 17:16:40,041 INFO L85 PathProgramCache]: Analyzing trace with hash -1932789221, now seen corresponding path program 2 times [2022-04-06 17:16:40,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 17:16:40,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329520977] [2022-04-06 17:16:40,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 17:16:40,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 17:16:40,047 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 17:16:40,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1359034072] [2022-04-06 17:16:40,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 17:16:40,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 17:16:40,047 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 17:16:40,048 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 17:16:40,049 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-04-06 17:16:40,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 17:16:40,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 17:16:40,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 47 conjunts are in the unsatisfiable core [2022-04-06 17:16:40,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 17:16:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 711 backedges. 36 proven. 51 refuted. 0 times theorem prover too weak. 624 trivial. 0 not checked. [2022-04-06 17:16:41,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 17:17:47,069 WARN L232 SmtUtils]: Spent 20.36s on a formula simplification that was a NOOP. DAG size: 432 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)