/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-18 03:15:30,756 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-18 03:15:30,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-18 03:15:30,818 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-18 03:15:30,855 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-18 03:15:30,856 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-18 03:15:30,857 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-18 03:15:30,857 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-18 03:15:30,865 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-18 03:15:30,866 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-18 03:15:30,866 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-18 03:15:30,867 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-18 03:15:30,868 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 03:15:30,868 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-18 03:15:30,868 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-18 03:15:30,869 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-18 03:15:30,869 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-18 03:15:30,869 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-18 03:15:30,869 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-18 03:15:30,869 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-18 03:15:31,061 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-18 03:15:31,077 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-18 03:15:31,079 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-18 03:15:31,080 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-18 03:15:31,080 INFO L275 PluginConnector]: CDTParser initialized [2022-03-18 03:15:31,081 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound1.c [2022-03-18 03:15:31,118 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b53b1cdd/ed5915e570fe496c993c524c2965ab00/FLAG6cae18d28 [2022-03-18 03:15:31,475 INFO L306 CDTParser]: Found 1 translation units. [2022-03-18 03:15:31,476 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound1.c [2022-03-18 03:15:31,481 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b53b1cdd/ed5915e570fe496c993c524c2965ab00/FLAG6cae18d28 [2022-03-18 03:15:31,492 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b53b1cdd/ed5915e570fe496c993c524c2965ab00 [2022-03-18 03:15:31,494 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-18 03:15:31,495 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-18 03:15:31,498 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-18 03:15:31,498 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-18 03:15:31,501 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-18 03:15:31,501 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,502 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c8e395b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31, skipping insertion in model container [2022-03-18 03:15:31,502 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,507 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-18 03:15:31,516 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-18 03:15:31,659 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_unwindbound1.c[538,551] [2022-03-18 03:15:31,677 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 03:15:31,683 INFO L203 MainTranslator]: Completed pre-run [2022-03-18 03:15:31,692 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_unwindbound1.c[538,551] [2022-03-18 03:15:31,706 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-18 03:15:31,717 INFO L208 MainTranslator]: Completed translation [2022-03-18 03:15:31,717 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31 WrapperNode [2022-03-18 03:15:31,717 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-18 03:15:31,718 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-18 03:15:31,718 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-18 03:15:31,719 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-18 03:15:31,725 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,726 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,730 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,730 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,738 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,743 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,749 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,752 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-18 03:15:31,752 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-18 03:15:31,753 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-18 03:15:31,753 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-18 03:15:31,753 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (1/1) ... [2022-03-18 03:15:31,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-18 03:15:31,771 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:15:31,779 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-18 03:15:31,794 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-18 03:15:31,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-18 03:15:31,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-18 03:15:31,811 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-18 03:15:31,811 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-18 03:15:31,811 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-18 03:15:31,812 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-18 03:15:31,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-18 03:15:31,813 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-18 03:15:31,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-18 03:15:31,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-18 03:15:31,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-18 03:15:31,814 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-18 03:15:31,814 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-18 03:15:31,814 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-18 03:15:31,857 INFO L234 CfgBuilder]: Building ICFG [2022-03-18 03:15:31,858 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-18 03:15:32,000 INFO L275 CfgBuilder]: Performing block encoding [2022-03-18 03:15:32,004 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-18 03:15:32,004 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-18 03:15:32,005 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 03:15:32 BoogieIcfgContainer [2022-03-18 03:15:32,005 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-18 03:15:32,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-18 03:15:32,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-18 03:15:32,008 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-18 03:15:32,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.03 03:15:31" (1/3) ... [2022-03-18 03:15:32,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbda9a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 03:15:32, skipping insertion in model container [2022-03-18 03:15:32,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.03 03:15:31" (2/3) ... [2022-03-18 03:15:32,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bbda9a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.03 03:15:32, skipping insertion in model container [2022-03-18 03:15:32,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.03 03:15:32" (3/3) ... [2022-03-18 03:15:32,010 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_unwindbound1.c [2022-03-18 03:15:32,013 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-18 03:15:32,013 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-18 03:15:32,037 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-18 03:15:32,041 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-18 03:15:32,041 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-18 03:15:32,049 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-18 03:15:32,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 03:15:32,054 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:32,054 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:32,054 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:32,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:32,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2022-03-18 03:15:32,062 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1018683317] [2022-03-18 03:15:32,069 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:32,069 INFO L85 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 2 times [2022-03-18 03:15:32,070 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:32,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180575073] [2022-03-18 03:15:32,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:32,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:32,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,222 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 03:15:32,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 03:15:32,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,241 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 03:15:32,242 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:32,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180575073] [2022-03-18 03:15:32,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1180575073] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,243 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 03:15:32,244 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:32,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1018683317] [2022-03-18 03:15:32,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1018683317] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,245 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-18 03:15:32,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403058561] [2022-03-18 03:15:32,245 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:32,250 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-18 03:15:32,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-18 03:15:32,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 03:15:32,271 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 03:15:32,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:32,371 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2022-03-18 03:15:32,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-18 03:15:32,373 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-03-18 03:15:32,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:32,378 INFO L225 Difference]: With dead ends: 66 [2022-03-18 03:15:32,378 INFO L226 Difference]: Without dead ends: 33 [2022-03-18 03:15:32,380 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-18 03:15:32,383 INFO L912 BasicCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:32,385 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 03:15:32,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-18 03:15:32,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-03-18 03:15:32,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 03:15:32,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-03-18 03:15:32,417 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2022-03-18 03:15:32,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:32,417 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-03-18 03:15:32,417 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 03:15:32,417 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-03-18 03:15:32,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-18 03:15:32,418 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:32,418 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:32,419 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-18 03:15:32,419 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:32,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:32,420 INFO L85 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2022-03-18 03:15:32,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [200470525] [2022-03-18 03:15:32,422 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:32,422 INFO L85 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 2 times [2022-03-18 03:15:32,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:32,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141924732] [2022-03-18 03:15:32,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:32,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:32,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 03:15:32,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 03:15:32,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:32,539 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 03:15:32,539 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:32,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141924732] [2022-03-18 03:15:32,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141924732] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,541 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 03:15:32,542 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:32,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [200470525] [2022-03-18 03:15:32,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [200470525] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,542 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 03:15:32,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457618192] [2022-03-18 03:15:32,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:32,544 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 03:15:32,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 03:15:32,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 03:15:32,545 INFO L87 Difference]: Start difference. First operand 32 states and 42 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 03:15:32,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:32,688 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2022-03-18 03:15:32,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 03:15:32,689 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-03-18 03:15:32,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:32,694 INFO L225 Difference]: With dead ends: 47 [2022-03-18 03:15:32,694 INFO L226 Difference]: Without dead ends: 45 [2022-03-18 03:15:32,699 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 03:15:32,701 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 28 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:32,701 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 96 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 03:15:32,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-18 03:15:32,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2022-03-18 03:15:32,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 03:15:32,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2022-03-18 03:15:32,715 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2022-03-18 03:15:32,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:32,716 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2022-03-18 03:15:32,716 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-18 03:15:32,716 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2022-03-18 03:15:32,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-18 03:15:32,716 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:32,716 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:32,717 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-18 03:15:32,717 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:32,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:32,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2022-03-18 03:15:32,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1470520987] [2022-03-18 03:15:32,718 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:32,718 INFO L85 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 2 times [2022-03-18 03:15:32,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:32,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203775524] [2022-03-18 03:15:32,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:32,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:32,727 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:15:32,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1209375930] [2022-03-18 03:15:32,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 03:15:32,728 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:15:32,728 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:15:32,732 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:15:32,733 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-18 03:15:32,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-18 03:15:32,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 03:15:32,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-18 03:15:32,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:15:32,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 03:15:32,864 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:15:32,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:32,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203775524] [2022-03-18 03:15:32,865 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:15:32,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209375930] [2022-03-18 03:15:32,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209375930] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,865 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 03:15:32,866 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:32,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1470520987] [2022-03-18 03:15:32,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1470520987] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:32,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:32,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-18 03:15:32,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939082544] [2022-03-18 03:15:32,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:32,866 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-18 03:15:32,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:32,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-18 03:15:32,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 03:15:32,867 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 03:15:32,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:32,882 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2022-03-18 03:15:32,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-18 03:15:32,882 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-03-18 03:15:32,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:32,883 INFO L225 Difference]: With dead ends: 52 [2022-03-18 03:15:32,883 INFO L226 Difference]: Without dead ends: 38 [2022-03-18 03:15:32,884 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-18 03:15:32,888 INFO L912 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:32,890 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 03:15:32,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-18 03:15:32,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-18 03:15:32,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 03:15:32,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2022-03-18 03:15:32,895 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2022-03-18 03:15:32,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:32,896 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2022-03-18 03:15:32,896 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-18 03:15:32,896 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2022-03-18 03:15:32,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-18 03:15:32,896 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:32,896 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:32,916 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-18 03:15:33,115 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:15:33,116 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:33,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:33,116 INFO L85 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2022-03-18 03:15:33,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [210755724] [2022-03-18 03:15:33,117 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:33,117 INFO L85 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 2 times [2022-03-18 03:15:33,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:33,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804827733] [2022-03-18 03:15:33,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:33,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:33,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:33,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-18 03:15:33,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:33,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-18 03:15:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:33,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-03-18 03:15:33,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:33,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-18 03:15:33,204 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:33,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804827733] [2022-03-18 03:15:33,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804827733] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 03:15:33,204 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:33,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [210755724] [2022-03-18 03:15:33,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [210755724] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-18 03:15:33,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509047637] [2022-03-18 03:15:33,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:33,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-18 03:15:33,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-18 03:15:33,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-18 03:15:33,206 INFO L87 Difference]: Start difference. First operand 38 states and 47 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 03:15:33,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:33,331 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2022-03-18 03:15:33,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-18 03:15:33,332 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-18 03:15:33,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:33,334 INFO L225 Difference]: With dead ends: 52 [2022-03-18 03:15:33,336 INFO L226 Difference]: Without dead ends: 50 [2022-03-18 03:15:33,336 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-18 03:15:33,338 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 23 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:33,339 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 89 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-18 03:15:33,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-18 03:15:33,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2022-03-18 03:15:33,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-18 03:15:33,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-03-18 03:15:33,355 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2022-03-18 03:15:33,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:33,355 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-03-18 03:15:33,355 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, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-18 03:15:33,356 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-03-18 03:15:33,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-18 03:15:33,357 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:33,357 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:33,357 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-18 03:15:33,357 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:33,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:33,357 INFO L85 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2022-03-18 03:15:33,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [15422678] [2022-03-18 03:15:33,358 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:33,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 2 times [2022-03-18 03:15:33,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:33,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128492642] [2022-03-18 03:15:33,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:33,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:33,366 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:15:33,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177913570] [2022-03-18 03:15:33,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 03:15:33,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:15:33,366 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:15:33,367 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:15:33,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-18 03:15:33,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 03:15:33,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 03:15:33,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 03:15:33,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:15:33,469 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 03:15:33,469 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:15:33,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:33,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128492642] [2022-03-18 03:15:33,469 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:15:33,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177913570] [2022-03-18 03:15:33,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177913570] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:15:33,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:33,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [15422678] [2022-03-18 03:15:33,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [15422678] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,470 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:15:33,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917518472] [2022-03-18 03:15:33,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:33,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 03:15:33,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 03:15:33,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 03:15:33,471 INFO L87 Difference]: Start difference. First operand 42 states and 50 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 03:15:33,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:33,510 INFO L93 Difference]: Finished difference Result 71 states and 93 transitions. [2022-03-18 03:15:33,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 03:15:33,510 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-03-18 03:15:33,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:33,511 INFO L225 Difference]: With dead ends: 71 [2022-03-18 03:15:33,511 INFO L226 Difference]: Without dead ends: 56 [2022-03-18 03:15:33,512 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 03:15:33,512 INFO L912 BasicCegarLoop]: 44 mSDtfsCounter, 10 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:33,512 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 154 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 03:15:33,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-18 03:15:33,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2022-03-18 03:15:33,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2022-03-18 03:15:33,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-03-18 03:15:33,520 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 28 [2022-03-18 03:15:33,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:33,530 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-03-18 03:15:33,530 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, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-18 03:15:33,530 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-03-18 03:15:33,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-18 03:15:33,531 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:33,531 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:33,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-18 03:15:33,747 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 [2022-03-18 03:15:33,747 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:33,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:33,748 INFO L85 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2022-03-18 03:15:33,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [798367736] [2022-03-18 03:15:33,750 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-18 03:15:33,750 INFO L85 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 2 times [2022-03-18 03:15:33,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:33,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284763684] [2022-03-18 03:15:33,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:33,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:33,763 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:15:33,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1410547997] [2022-03-18 03:15:33,763 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-18 03:15:33,763 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:15:33,763 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:15:33,764 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:15:33,769 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-18 03:15:33,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-18 03:15:33,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-18 03:15:33,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-18 03:15:33,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:15:33,911 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-18 03:15:33,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:15:33,911 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:33,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284763684] [2022-03-18 03:15:33,911 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:15:33,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410547997] [2022-03-18 03:15:33,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410547997] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,912 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:15:33,912 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:33,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [798367736] [2022-03-18 03:15:33,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [798367736] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:33,912 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:33,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:15:33,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105253285] [2022-03-18 03:15:33,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:33,913 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-18 03:15:33,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:33,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-18 03:15:33,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-18 03:15:33,913 INFO L87 Difference]: Start difference. First operand 56 states and 70 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 03:15:33,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:33,955 INFO L93 Difference]: Finished difference Result 70 states and 89 transitions. [2022-03-18 03:15:33,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-18 03:15:33,955 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, (7), 2 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 36 [2022-03-18 03:15:33,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:33,957 INFO L225 Difference]: With dead ends: 70 [2022-03-18 03:15:33,957 INFO L226 Difference]: Without dead ends: 62 [2022-03-18 03:15:33,957 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-18 03:15:33,958 INFO L912 BasicCegarLoop]: 35 mSDtfsCounter, 11 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:33,959 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 126 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-18 03:15:33,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-18 03:15:33,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-03-18 03:15:33,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 37 states have (on average 1.2432432432432432) internal successors, (46), 39 states have internal predecessors, (46), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 03:15:33,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2022-03-18 03:15:33,979 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 36 [2022-03-18 03:15:33,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:33,980 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2022-03-18 03:15:33,980 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-18 03:15:33,980 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2022-03-18 03:15:33,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-18 03:15:33,985 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:33,985 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:34,001 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-18 03:15:34,201 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 [2022-03-18 03:15:34,201 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:34,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:34,202 INFO L85 PathProgramCache]: Analyzing trace with hash 817878903, now seen corresponding path program 1 times [2022-03-18 03:15:34,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:34,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1678511085] [2022-03-18 03:15:34,671 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 03:15:34,672 INFO L85 PathProgramCache]: Analyzing trace with hash 119537629, now seen corresponding path program 1 times [2022-03-18 03:15:34,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:15:34,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962427207] [2022-03-18 03:15:34,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:34,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:15:34,678 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:15:34,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1658585663] [2022-03-18 03:15:34,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:15:34,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:15:34,678 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:15:34,679 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:15:34,683 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-18 03:15:34,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:15:34,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 03:15:34,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:15:34,769 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 03:15:34,769 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:15:34,769 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:15:34,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962427207] [2022-03-18 03:15:34,769 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:15:34,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658585663] [2022-03-18 03:15:34,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658585663] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:34,770 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:34,770 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:15:35,037 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:15:35,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1678511085] [2022-03-18 03:15:35,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1678511085] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:15:35,037 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:15:35,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-18 03:15:35,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533815395] [2022-03-18 03:15:35,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:15:35,038 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 03:15:35,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:35,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 03:15:35,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-03-18 03:15:35,038 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 20 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 03:15:35,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:15:35,347 INFO L93 Difference]: Finished difference Result 96 states and 120 transitions. [2022-03-18 03:15:35,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-18 03:15:35,348 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 43 [2022-03-18 03:15:35,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:15:35,349 INFO L225 Difference]: With dead ends: 96 [2022-03-18 03:15:35,349 INFO L226 Difference]: Without dead ends: 71 [2022-03-18 03:15:35,350 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2022-03-18 03:15:35,351 INFO L912 BasicCegarLoop]: 39 mSDtfsCounter, 18 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 259 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 03:15:35,351 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 259 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 03:15:35,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-18 03:15:35,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-18 03:15:35,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 45 states have (on average 1.2) internal successors, (54), 47 states have internal predecessors, (54), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-18 03:15:35,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 84 transitions. [2022-03-18 03:15:35,358 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 84 transitions. Word has length 43 [2022-03-18 03:15:35,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:15:35,359 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 84 transitions. [2022-03-18 03:15:35,359 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 13 states have internal predecessors, (28), 6 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-18 03:15:35,359 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 84 transitions. [2022-03-18 03:15:35,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-18 03:15:35,359 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:15:35,359 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:15:35,379 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-18 03:15:35,576 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 [2022-03-18 03:15:35,576 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:15:35,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:15:35,577 INFO L85 PathProgramCache]: Analyzing trace with hash 1861890039, now seen corresponding path program 1 times [2022-03-18 03:15:35,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:15:35,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [995581225] [2022-03-18 03:16:47,736 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 03:16:47,737 INFO L85 PathProgramCache]: Analyzing trace with hash -210838127, now seen corresponding path program 1 times [2022-03-18 03:16:47,737 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:16:47,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092286257] [2022-03-18 03:16:47,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:16:47,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:16:47,744 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:16:47,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2131635229] [2022-03-18 03:16:47,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:16:47,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:16:47,745 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:16:47,752 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:16:47,754 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-18 03:16:47,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:16:47,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 03:16:47,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:16:47,852 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-18 03:16:47,852 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:16:47,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:16:47,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092286257] [2022-03-18 03:16:47,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:16:47,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131635229] [2022-03-18 03:16:47,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131635229] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:16:47,853 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:16:47,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:16:48,130 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:16:48,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [995581225] [2022-03-18 03:16:48,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [995581225] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:16:48,131 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:16:48,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-18 03:16:48,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067851145] [2022-03-18 03:16:48,131 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:16:48,131 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-18 03:16:48,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:16:48,132 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-18 03:16:48,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2022-03-18 03:16:48,132 INFO L87 Difference]: Start difference. First operand 71 states and 84 transitions. Second operand has 20 states, 17 states have (on average 1.588235294117647) internal successors, (27), 13 states have internal predecessors, (27), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-18 03:16:48,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:16:48,468 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2022-03-18 03:16:48,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-18 03:16:48,469 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 1.588235294117647) internal successors, (27), 13 states have internal predecessors, (27), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 46 [2022-03-18 03:16:48,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:16:48,469 INFO L225 Difference]: With dead ends: 111 [2022-03-18 03:16:48,470 INFO L226 Difference]: Without dead ends: 79 [2022-03-18 03:16:48,470 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2022-03-18 03:16:48,470 INFO L912 BasicCegarLoop]: 43 mSDtfsCounter, 30 mSDsluCounter, 362 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-18 03:16:48,471 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 405 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-18 03:16:48,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-18 03:16:48,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-18 03:16:48,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 49 states have (on average 1.183673469387755) internal successors, (58), 51 states have internal predecessors, (58), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 03:16:48,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2022-03-18 03:16:48,478 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 46 [2022-03-18 03:16:48,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:16:48,478 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2022-03-18 03:16:48,478 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 1.588235294117647) internal successors, (27), 13 states have internal predecessors, (27), 5 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-18 03:16:48,478 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2022-03-18 03:16:48,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-18 03:16:48,479 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:16:48,479 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:16:48,497 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-18 03:16:48,692 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 [2022-03-18 03:16:48,693 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:16:48,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:16:48,693 INFO L85 PathProgramCache]: Analyzing trace with hash 940283669, now seen corresponding path program 2 times [2022-03-18 03:16:48,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:16:48,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [386546177] [2022-03-18 03:29:46,086 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-18 03:29:46,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1218658397, now seen corresponding path program 1 times [2022-03-18 03:29:46,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-18 03:29:46,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [837532986] [2022-03-18 03:29:46,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:29:46,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-18 03:29:46,092 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-18 03:29:46,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [772135383] [2022-03-18 03:29:46,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-18 03:29:46,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-18 03:29:46,092 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-18 03:29:46,094 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-18 03:29:46,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-18 03:29:46,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-18 03:29:46,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-18 03:29:46,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-18 03:29:46,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-18 03:29:46,178 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-18 03:29:46,178 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-18 03:29:46,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [837532986] [2022-03-18 03:29:46,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-18 03:29:46,179 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772135383] [2022-03-18 03:29:46,179 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772135383] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:29:46,179 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:29:46,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-18 03:29:50,133 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-18 03:29:50,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [386546177] [2022-03-18 03:29:50,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [386546177] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-18 03:29:50,134 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-18 03:29:50,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-18 03:29:50,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772515796] [2022-03-18 03:29:50,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-18 03:29:50,134 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-18 03:29:50,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-18 03:29:50,134 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-18 03:29:50,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2022-03-18 03:29:50,135 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand has 24 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 16 states have internal predecessors, (33), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-18 03:29:50,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-18 03:29:50,639 INFO L93 Difference]: Finished difference Result 111 states and 135 transitions. [2022-03-18 03:29:50,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-18 03:29:50,639 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 16 states have internal predecessors, (33), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) Word has length 61 [2022-03-18 03:29:50,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-18 03:29:50,640 INFO L225 Difference]: With dead ends: 111 [2022-03-18 03:29:50,640 INFO L226 Difference]: Without dead ends: 86 [2022-03-18 03:29:50,641 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=133, Invalid=797, Unknown=0, NotChecked=0, Total=930 [2022-03-18 03:29:50,641 INFO L912 BasicCegarLoop]: 36 mSDtfsCounter, 28 mSDsluCounter, 238 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-18 03:29:50,641 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 274 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-18 03:29:50,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-18 03:29:50,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2022-03-18 03:29:50,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 52 states have (on average 1.1730769230769231) internal successors, (61), 54 states have internal predecessors, (61), 19 states have call successors, (19), 12 states have call predecessors, (19), 11 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-18 03:29:50,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2022-03-18 03:29:50,655 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 61 [2022-03-18 03:29:50,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-18 03:29:50,655 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2022-03-18 03:29:50,655 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 16 states have internal predecessors, (33), 7 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-18 03:29:50,655 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2022-03-18 03:29:50,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-03-18 03:29:50,657 INFO L492 BasicCegarLoop]: Found error trace [2022-03-18 03:29:50,657 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-18 03:29:50,674 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-18 03:29:50,871 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 [2022-03-18 03:29:50,872 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-18 03:29:50,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-18 03:29:50,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1995039641, now seen corresponding path program 2 times [2022-03-18 03:29:50,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-18 03:29:50,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [556019031]