/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/prod4br-ll_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 22:27:13,794 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 22:27:13,818 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 22:27:13,837 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 22:27:13,856 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 22:27:13,857 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 22:27:13,857 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 22:27:13,858 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 22:27:13,863 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 22:27:13,863 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 22:27:13,864 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 22:27:13,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 22:27:13,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 22:27:13,864 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 22:27:13,864 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 22:27:13,864 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 22:27:13,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 22:27:13,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 22:27:13,865 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 22:27:13,866 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 22:27:14,045 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 22:27:14,061 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 22:27:14,062 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 22:27:14,063 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 22:27:14,064 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 22:27:14,065 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c [2022-03-20 22:27:14,109 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9314edfd/e219ae16b112403896929af9a063199d/FLAG740d24b7d [2022-03-20 22:27:14,392 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 22:27:14,392 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c [2022-03-20 22:27:14,397 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9314edfd/e219ae16b112403896929af9a063199d/FLAG740d24b7d [2022-03-20 22:27:14,836 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9314edfd/e219ae16b112403896929af9a063199d [2022-03-20 22:27:14,838 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 22:27:14,839 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 22:27:14,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 22:27:14,844 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 22:27:14,846 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 22:27:14,846 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 10:27:14" (1/1) ... [2022-03-20 22:27:14,847 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72c02124 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:14, skipping insertion in model container [2022-03-20 22:27:14,847 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 10:27:14" (1/1) ... [2022-03-20 22:27:14,853 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 22:27:14,861 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 22:27:14,976 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c[524,537] [2022-03-20 22:27:14,989 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 22:27:14,994 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 22:27:15,000 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/prod4br-ll_valuebound5.c[524,537] [2022-03-20 22:27:15,005 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 22:27:15,012 INFO L208 MainTranslator]: Completed translation [2022-03-20 22:27:15,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15 WrapperNode [2022-03-20 22:27:15,013 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 22:27:15,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 22:27:15,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 22:27:15,013 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 22:27:15,021 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,024 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,025 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,027 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,029 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,030 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,035 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 22:27:15,036 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 22:27:15,036 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 22:27:15,037 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 22:27:15,037 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (1/1) ... [2022-03-20 22:27:15,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 22:27:15,053 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:15,062 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 22:27:15,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 22:27:15,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 22:27:15,092 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 22:27:15,092 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 22:27:15,092 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 22:27:15,092 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 22:27:15,093 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 22:27:15,093 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 22:27:15,093 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 22:27:15,093 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 22:27:15,094 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 22:27:15,094 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 22:27:15,094 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 22:27:15,095 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 22:27:15,095 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 22:27:15,095 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 22:27:15,097 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 22:27:15,097 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 22:27:15,097 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 22:27:15,097 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 22:27:15,097 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 22:27:15,139 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 22:27:15,140 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 22:27:15,228 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 22:27:15,232 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 22:27:15,232 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 22:27:15,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 10:27:15 BoogieIcfgContainer [2022-03-20 22:27:15,233 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 22:27:15,234 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 22:27:15,234 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 22:27:15,253 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 22:27:15,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 10:27:14" (1/3) ... [2022-03-20 22:27:15,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa5d1f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 10:27:15, skipping insertion in model container [2022-03-20 22:27:15,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 10:27:15" (2/3) ... [2022-03-20 22:27:15,254 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4aa5d1f1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 10:27:15, skipping insertion in model container [2022-03-20 22:27:15,254 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 10:27:15" (3/3) ... [2022-03-20 22:27:15,255 INFO L111 eAbstractionObserver]: Analyzing ICFG prod4br-ll_valuebound5.c [2022-03-20 22:27:15,258 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 22:27:15,258 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 22:27:15,310 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 22:27:15,315 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 22:27:15,315 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 22:27:15,326 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 22:27:15,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 22:27:15,339 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:15,339 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:15,340 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:15,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:15,347 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 1 times [2022-03-20 22:27:15,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:15,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1654008846] [2022-03-20 22:27:15,367 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:15,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1738134960, now seen corresponding path program 2 times [2022-03-20 22:27:15,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:15,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030009644] [2022-03-20 22:27:15,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:15,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:15,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 22:27:15,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 22:27:15,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 22:27:15,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 22:27:15,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 22:27:15,533 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2022-03-20 22:27:15,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 22:27:15,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 22:27:15,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 22:27:15,552 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:15,552 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:15,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030009644] [2022-03-20 22:27:15,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030009644] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:15,553 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:15,553 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 22:27:15,555 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:15,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1654008846] [2022-03-20 22:27:15,556 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1654008846] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:15,556 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:15,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 22:27:15,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405414948] [2022-03-20 22:27:15,557 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:15,560 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 22:27:15,561 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:15,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 22:27:15,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 22:27:15,583 INFO L87 Difference]: Start difference. First operand has 34 states, 20 states have (on average 1.45) internal successors, (29), 21 states have internal predecessors, (29), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 22:27:15,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:15,654 INFO L93 Difference]: Finished difference Result 61 states and 88 transitions. [2022-03-20 22:27:15,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 22:27:15,656 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2022-03-20 22:27:15,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:15,661 INFO L225 Difference]: With dead ends: 61 [2022-03-20 22:27:15,661 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 22:27:15,663 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 22:27:15,669 INFO L913 BasicCegarLoop]: 35 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:15,670 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 38 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 22:27:15,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 22:27:15,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 22:27:15,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 18 states have internal predecessors, (22), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 22:27:15,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-03-20 22:27:15,699 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 28 [2022-03-20 22:27:15,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:15,699 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-03-20 22:27:15,699 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-20 22:27:15,699 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-03-20 22:27:15,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-20 22:27:15,701 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:15,702 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:15,702 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 22:27:15,702 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:15,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:15,705 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 1 times [2022-03-20 22:27:15,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:15,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [658934058] [2022-03-20 22:27:15,708 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:15,708 INFO L85 PathProgramCache]: Analyzing trace with hash 567203544, now seen corresponding path program 2 times [2022-03-20 22:27:15,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:15,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795595686] [2022-03-20 22:27:15,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:15,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:15,741 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:15,743 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [60471102] [2022-03-20 22:27:15,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:15,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:15,744 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:15,745 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:15,746 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 22:27:15,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 22:27:15,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:15,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 22:27:15,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:15,942 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:15,943 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 22:27:15,943 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:15,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795595686] [2022-03-20 22:27:15,943 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:15,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60471102] [2022-03-20 22:27:15,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60471102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:15,943 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:15,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 22:27:15,944 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:15,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [658934058] [2022-03-20 22:27:15,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [658934058] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:15,944 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:15,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 22:27:15,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000814410] [2022-03-20 22:27:15,945 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:15,945 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 22:27:15,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:15,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 22:27:15,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 22:27:15,946 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 22:27:16,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:16,021 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2022-03-20 22:27:16,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 22:27:16,022 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 28 [2022-03-20 22:27:16,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:16,023 INFO L225 Difference]: With dead ends: 43 [2022-03-20 22:27:16,023 INFO L226 Difference]: Without dead ends: 41 [2022-03-20 22:27:16,024 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 22:27:16,024 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 9 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:16,025 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 101 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 22:27:16,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-20 22:27:16,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 35. [2022-03-20 22:27:16,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 23 states have internal predecessors, (26), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 22:27:16,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 42 transitions. [2022-03-20 22:27:16,032 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 42 transitions. Word has length 28 [2022-03-20 22:27:16,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:16,032 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 42 transitions. [2022-03-20 22:27:16,032 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2022-03-20 22:27:16,032 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 42 transitions. [2022-03-20 22:27:16,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-20 22:27:16,036 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:16,037 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:16,054 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:16,243 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:16,244 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:16,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:16,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 1 times [2022-03-20 22:27:16,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:16,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1342416853] [2022-03-20 22:27:16,245 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:16,245 INFO L85 PathProgramCache]: Analyzing trace with hash -1139707498, now seen corresponding path program 2 times [2022-03-20 22:27:16,245 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:16,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975461629] [2022-03-20 22:27:16,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:16,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:16,254 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:16,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [950930463] [2022-03-20 22:27:16,255 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:16,255 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:16,255 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:16,256 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:16,257 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 22:27:16,294 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:16,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:16,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-20 22:27:16,299 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:16,693 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 22:27:16,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:16,894 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:16,894 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:16,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975461629] [2022-03-20 22:27:16,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:16,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [950930463] [2022-03-20 22:27:16,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [950930463] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:16,894 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:16,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 16 [2022-03-20 22:27:16,895 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:16,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1342416853] [2022-03-20 22:27:16,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1342416853] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:16,895 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:16,895 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 22:27:16,895 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900602151] [2022-03-20 22:27:16,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:16,895 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 22:27:16,896 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:16,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 22:27:16,896 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-03-20 22:27:16,897 INFO L87 Difference]: Start difference. First operand 35 states and 42 transitions. Second operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 22:27:18,998 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:21,732 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:21,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:21,773 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2022-03-20 22:27:21,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-20 22:27:21,774 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 34 [2022-03-20 22:27:21,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:21,774 INFO L225 Difference]: With dead ends: 47 [2022-03-20 22:27:21,775 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 22:27:21,775 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2022-03-20 22:27:21,775 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 40 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 16 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:21,776 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 148 Invalid, 227 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 209 Invalid, 2 Unknown, 0 Unchecked, 4.8s Time] [2022-03-20 22:27:21,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 22:27:21,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2022-03-20 22:27:21,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 25 states have (on average 1.24) internal successors, (31), 27 states have internal predecessors, (31), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 22:27:21,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2022-03-20 22:27:21,782 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 34 [2022-03-20 22:27:21,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:21,783 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2022-03-20 22:27:21,783 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 22:27:21,783 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2022-03-20 22:27:21,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-20 22:27:21,784 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:21,784 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:21,805 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:21,995 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 22:27:21,996 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:21,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:21,996 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 1 times [2022-03-20 22:27:21,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:21,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1296642227] [2022-03-20 22:27:21,997 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:21,997 INFO L85 PathProgramCache]: Analyzing trace with hash 412541489, now seen corresponding path program 2 times [2022-03-20 22:27:21,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:21,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111176374] [2022-03-20 22:27:21,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:21,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:22,006 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:22,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1193408692] [2022-03-20 22:27:22,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:22,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:22,007 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:22,008 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:22,009 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 22:27:22,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:22,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:22,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 22:27:22,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:22,756 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:22,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:23,950 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 22:27:23,951 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:23,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111176374] [2022-03-20 22:27:23,951 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:23,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193408692] [2022-03-20 22:27:23,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193408692] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:23,951 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:23,951 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 21 [2022-03-20 22:27:23,952 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:23,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1296642227] [2022-03-20 22:27:23,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1296642227] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:23,952 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:23,952 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 22:27:23,952 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889656003] [2022-03-20 22:27:23,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:23,955 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 22:27:23,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:23,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 22:27:23,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2022-03-20 22:27:23,956 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 22:27:24,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:24,259 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2022-03-20 22:27:24,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 22:27:24,260 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 36 [2022-03-20 22:27:24,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:24,260 INFO L225 Difference]: With dead ends: 63 [2022-03-20 22:27:24,260 INFO L226 Difference]: Without dead ends: 55 [2022-03-20 22:27:24,261 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2022-03-20 22:27:24,261 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 52 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:24,261 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 136 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 22:27:24,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-20 22:27:24,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 49. [2022-03-20 22:27:24,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 33 states have internal predecessors, (38), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 22:27:24,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 58 transitions. [2022-03-20 22:27:24,272 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 58 transitions. Word has length 36 [2022-03-20 22:27:24,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:24,272 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 58 transitions. [2022-03-20 22:27:24,272 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 22:27:24,272 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 58 transitions. [2022-03-20 22:27:24,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 22:27:24,275 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:24,275 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:24,294 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:24,491 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:24,492 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:24,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:24,492 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 1 times [2022-03-20 22:27:24,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:24,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1989050781] [2022-03-20 22:27:24,493 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:24,493 INFO L85 PathProgramCache]: Analyzing trace with hash 2032180221, now seen corresponding path program 2 times [2022-03-20 22:27:24,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:24,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687296559] [2022-03-20 22:27:24,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:24,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:24,502 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:24,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1239573227] [2022-03-20 22:27:24,502 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:24,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:24,502 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:24,503 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:24,519 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 22:27:24,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:24,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:24,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 22:27:24,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:24,696 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 22:27:24,697 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:25,049 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:25,050 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:25,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687296559] [2022-03-20 22:27:25,050 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:25,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239573227] [2022-03-20 22:27:25,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239573227] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:25,050 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:25,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 15 [2022-03-20 22:27:25,050 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:25,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1989050781] [2022-03-20 22:27:25,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1989050781] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:25,050 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:25,050 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 22:27:25,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565764897] [2022-03-20 22:27:25,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:25,051 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 22:27:25,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:25,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 22:27:25,051 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2022-03-20 22:27:25,051 INFO L87 Difference]: Start difference. First operand 49 states and 58 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 22:27:25,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:25,335 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2022-03-20 22:27:25,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 22:27:25,336 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 37 [2022-03-20 22:27:25,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:25,336 INFO L225 Difference]: With dead ends: 78 [2022-03-20 22:27:25,336 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 22:27:25,337 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-03-20 22:27:25,337 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:25,337 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 129 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 22:27:25,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 22:27:25,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 60. [2022-03-20 22:27:25,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 40 states have (on average 1.275) internal successors, (51), 42 states have internal predecessors, (51), 12 states have call successors, (12), 8 states have call predecessors, (12), 7 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 22:27:25,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 73 transitions. [2022-03-20 22:27:25,346 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 73 transitions. Word has length 37 [2022-03-20 22:27:25,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:25,346 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 73 transitions. [2022-03-20 22:27:25,346 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 22:27:25,346 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 73 transitions. [2022-03-20 22:27:25,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 22:27:25,347 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:25,347 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:25,365 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:25,563 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:25,563 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:25,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:25,564 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 1 times [2022-03-20 22:27:25,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:25,564 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [464865675] [2022-03-20 22:27:25,564 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:25,564 INFO L85 PathProgramCache]: Analyzing trace with hash 262800198, now seen corresponding path program 2 times [2022-03-20 22:27:25,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:25,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969849015] [2022-03-20 22:27:25,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:25,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:25,573 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:25,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [166876632] [2022-03-20 22:27:25,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:25,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:25,573 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:25,574 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:25,575 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 22:27:25,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:25,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:25,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-20 22:27:25,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:25,710 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 22:27:25,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:25,798 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-03-20 22:27:25,798 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:25,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969849015] [2022-03-20 22:27:25,799 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:25,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166876632] [2022-03-20 22:27:25,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166876632] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 22:27:25,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:27:25,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2022-03-20 22:27:25,799 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:25,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [464865675] [2022-03-20 22:27:25,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [464865675] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:25,799 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:25,799 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 22:27:25,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010255850] [2022-03-20 22:27:25,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:25,800 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 22:27:25,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:25,800 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 22:27:25,800 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-20 22:27:25,800 INFO L87 Difference]: Start difference. First operand 60 states and 73 transitions. Second operand has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:25,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:25,914 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2022-03-20 22:27:25,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 22:27:25,914 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 39 [2022-03-20 22:27:25,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:25,915 INFO L225 Difference]: With dead ends: 66 [2022-03-20 22:27:25,915 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 22:27:25,915 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2022-03-20 22:27:25,916 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 5 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:25,916 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 128 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 22:27:25,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 22:27:25,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-20 22:27:25,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 38 states have internal predecessors, (47), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 22:27:25,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-03-20 22:27:25,923 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 39 [2022-03-20 22:27:25,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:25,923 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-03-20 22:27:25,923 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.0) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:25,924 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-03-20 22:27:25,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 22:27:25,924 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:25,924 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:25,942 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-20 22:27:26,142 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:26,142 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:26,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:26,143 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 1 times [2022-03-20 22:27:26,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:26,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [321737372] [2022-03-20 22:27:26,143 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:26,143 INFO L85 PathProgramCache]: Analyzing trace with hash 844519116, now seen corresponding path program 2 times [2022-03-20 22:27:26,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:26,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947899542] [2022-03-20 22:27:26,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:26,143 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:26,150 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:26,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1551909808] [2022-03-20 22:27:26,150 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:26,151 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:26,151 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:26,157 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:26,158 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 22:27:26,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:26,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:26,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 30 conjunts are in the unsatisfiable core [2022-03-20 22:27:26,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:26,399 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 22:27:26,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:26,685 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:26,685 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:26,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947899542] [2022-03-20 22:27:26,685 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:26,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551909808] [2022-03-20 22:27:26,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1551909808] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:26,686 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:26,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 14 [2022-03-20 22:27:26,686 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:26,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [321737372] [2022-03-20 22:27:26,686 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [321737372] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:26,686 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:26,686 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 22:27:26,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584883857] [2022-03-20 22:27:26,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:26,686 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 22:27:26,686 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:26,687 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 22:27:26,687 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-03-20 22:27:26,687 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 22:27:26,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:26,889 INFO L93 Difference]: Finished difference Result 79 states and 100 transitions. [2022-03-20 22:27:26,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 22:27:26,889 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2022-03-20 22:27:26,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:26,890 INFO L225 Difference]: With dead ends: 79 [2022-03-20 22:27:26,890 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 22:27:26,890 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-03-20 22:27:26,891 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 32 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 213 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:26,891 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 125 Invalid, 213 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 22:27:26,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 22:27:26,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 22:27:26,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 45 states have (on average 1.288888888888889) internal successors, (58), 46 states have internal predecessors, (58), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 22:27:26,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 78 transitions. [2022-03-20 22:27:26,901 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 78 transitions. Word has length 38 [2022-03-20 22:27:26,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:26,901 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 78 transitions. [2022-03-20 22:27:26,901 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2022-03-20 22:27:26,901 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 78 transitions. [2022-03-20 22:27:26,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-20 22:27:26,902 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:26,902 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:26,920 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:27,118 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:27,118 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:27,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:27,119 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 1 times [2022-03-20 22:27:27,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:27,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1768939991] [2022-03-20 22:27:27,119 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:27,119 INFO L85 PathProgramCache]: Analyzing trace with hash 901777418, now seen corresponding path program 2 times [2022-03-20 22:27:27,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:27,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661045248] [2022-03-20 22:27:27,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:27,120 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:27,127 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:27,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2007831602] [2022-03-20 22:27:27,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:27,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:27,131 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:27,132 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:27,133 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 22:27:27,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:27,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:27,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-20 22:27:27,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:27,754 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:27,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:28,853 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:27:28,854 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:28,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661045248] [2022-03-20 22:27:28,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:28,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007831602] [2022-03-20 22:27:28,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007831602] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:28,854 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:28,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11] total 22 [2022-03-20 22:27:28,854 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:28,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1768939991] [2022-03-20 22:27:28,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1768939991] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:28,854 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:28,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-20 22:27:28,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273799580] [2022-03-20 22:27:28,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:28,855 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-20 22:27:28,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:28,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-20 22:27:28,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2022-03-20 22:27:28,856 INFO L87 Difference]: Start difference. First operand 64 states and 78 transitions. Second operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 22:27:29,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:29,012 INFO L93 Difference]: Finished difference Result 86 states and 107 transitions. [2022-03-20 22:27:29,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 22:27:29,013 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 38 [2022-03-20 22:27:29,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:29,013 INFO L225 Difference]: With dead ends: 86 [2022-03-20 22:27:29,013 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 22:27:29,014 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2022-03-20 22:27:29,014 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 36 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:29,014 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 158 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 22:27:29,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 22:27:29,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2022-03-20 22:27:29,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 51 states have (on average 1.2745098039215685) internal successors, (65), 52 states have internal predecessors, (65), 12 states have call successors, (12), 9 states have call predecessors, (12), 8 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 22:27:29,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 87 transitions. [2022-03-20 22:27:29,023 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 87 transitions. Word has length 38 [2022-03-20 22:27:29,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:29,023 INFO L478 AbstractCegarLoop]: Abstraction has 72 states and 87 transitions. [2022-03-20 22:27:29,024 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 13 states have internal predecessors, (20), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 22:27:29,024 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 87 transitions. [2022-03-20 22:27:29,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 22:27:29,024 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:29,024 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:29,030 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-20 22:27:29,228 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:29,228 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:29,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:29,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 1 times [2022-03-20 22:27:29,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:29,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1136317953] [2022-03-20 22:27:29,229 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:29,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1669465851, now seen corresponding path program 2 times [2022-03-20 22:27:29,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:29,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032453939] [2022-03-20 22:27:29,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:29,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:29,239 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:29,239 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1003347040] [2022-03-20 22:27:29,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:29,239 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:29,239 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:29,244 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:29,245 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 22:27:29,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:29,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:29,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-20 22:27:29,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:29,389 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 22:27:29,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:29,528 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:27:29,528 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:29,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032453939] [2022-03-20 22:27:29,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:29,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1003347040] [2022-03-20 22:27:29,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1003347040] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:29,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:29,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-20 22:27:29,529 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:29,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1136317953] [2022-03-20 22:27:29,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1136317953] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:29,529 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:29,529 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 22:27:29,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043301811] [2022-03-20 22:27:29,529 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:29,529 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 22:27:29,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:29,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 22:27:29,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 22:27:29,530 INFO L87 Difference]: Start difference. First operand 72 states and 87 transitions. Second operand has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:31,880 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:32,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:32,005 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2022-03-20 22:27:32,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 22:27:32,005 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 43 [2022-03-20 22:27:32,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:32,006 INFO L225 Difference]: With dead ends: 85 [2022-03-20 22:27:32,006 INFO L226 Difference]: Without dead ends: 78 [2022-03-20 22:27:32,006 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 75 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-20 22:27:32,007 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 15 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:32,007 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 164 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2022-03-20 22:27:32,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-20 22:27:32,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2022-03-20 22:27:32,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 52 states have (on average 1.25) internal successors, (65), 54 states have internal predecessors, (65), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-03-20 22:27:32,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 89 transitions. [2022-03-20 22:27:32,016 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 89 transitions. Word has length 43 [2022-03-20 22:27:32,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:32,016 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 89 transitions. [2022-03-20 22:27:32,016 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:32,016 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 89 transitions. [2022-03-20 22:27:32,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 22:27:32,017 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:32,017 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:32,033 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-03-20 22:27:32,223 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-03-20 22:27:32,223 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:32,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:32,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 3 times [2022-03-20 22:27:32,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:32,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1427877828] [2022-03-20 22:27:32,224 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:32,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1139704970, now seen corresponding path program 4 times [2022-03-20 22:27:32,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:32,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185595371] [2022-03-20 22:27:32,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:32,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:32,236 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:32,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1989747970] [2022-03-20 22:27:32,237 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:27:32,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:32,237 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:32,248 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:32,249 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 22:27:32,281 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:27:32,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:32,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 46 conjunts are in the unsatisfiable core [2022-03-20 22:27:32,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:34,072 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 6 proven. 15 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 22:27:34,072 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:42,023 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:42,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185595371] [2022-03-20 22:27:42,023 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:42,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989747970] [2022-03-20 22:27:42,023 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989747970] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 22:27:42,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:27:42,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-20 22:27:42,024 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:42,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1427877828] [2022-03-20 22:27:42,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1427877828] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:42,024 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:42,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:27:42,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664296101] [2022-03-20 22:27:42,024 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:42,024 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:27:42,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:42,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:27:42,025 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2022-03-20 22:27:42,025 INFO L87 Difference]: Start difference. First operand 74 states and 89 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:27:42,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:42,405 INFO L93 Difference]: Finished difference Result 104 states and 131 transitions. [2022-03-20 22:27:42,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 22:27:42,406 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 44 [2022-03-20 22:27:42,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:42,406 INFO L225 Difference]: With dead ends: 104 [2022-03-20 22:27:42,406 INFO L226 Difference]: Without dead ends: 88 [2022-03-20 22:27:42,407 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-03-20 22:27:42,407 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:42,407 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 164 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-20 22:27:42,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-03-20 22:27:42,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 85. [2022-03-20 22:27:42,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.2295081967213115) internal successors, (75), 62 states have internal predecessors, (75), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 22:27:42,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 101 transitions. [2022-03-20 22:27:42,419 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 101 transitions. Word has length 44 [2022-03-20 22:27:42,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:42,419 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 101 transitions. [2022-03-20 22:27:42,419 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 13 states have internal predecessors, (27), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:27:42,419 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 101 transitions. [2022-03-20 22:27:42,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 22:27:42,419 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:42,420 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:42,438 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-03-20 22:27:42,635 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-03-20 22:27:42,635 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:42,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:42,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 1 times [2022-03-20 22:27:42,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:42,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1959037997] [2022-03-20 22:27:42,636 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:42,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1372706166, now seen corresponding path program 2 times [2022-03-20 22:27:42,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:42,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038531253] [2022-03-20 22:27:42,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:42,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:42,643 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:42,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [63502503] [2022-03-20 22:27:42,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:42,643 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:42,643 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:42,647 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:42,651 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 22:27:42,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:42,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:42,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-20 22:27:42,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:42,786 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 22:27:42,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:42,901 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:27:42,902 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:42,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038531253] [2022-03-20 22:27:42,902 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:42,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63502503] [2022-03-20 22:27:42,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63502503] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:42,902 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:42,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 11 [2022-03-20 22:27:42,902 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:42,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1959037997] [2022-03-20 22:27:42,902 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1959037997] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:42,902 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:42,902 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 22:27:42,903 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595334774] [2022-03-20 22:27:42,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:42,903 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 22:27:42,903 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:42,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 22:27:42,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2022-03-20 22:27:42,903 INFO L87 Difference]: Start difference. First operand 85 states and 101 transitions. Second operand has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:45,170 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:45,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:45,411 INFO L93 Difference]: Finished difference Result 102 states and 123 transitions. [2022-03-20 22:27:45,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 22:27:45,411 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 44 [2022-03-20 22:27:45,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:45,413 INFO L225 Difference]: With dead ends: 102 [2022-03-20 22:27:45,413 INFO L226 Difference]: Without dead ends: 95 [2022-03-20 22:27:45,413 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-03-20 22:27:45,413 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 14 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:45,414 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 164 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 141 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2022-03-20 22:27:45,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-20 22:27:45,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 85. [2022-03-20 22:27:45,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.2131147540983607) internal successors, (74), 62 states have internal predecessors, (74), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 22:27:45,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 100 transitions. [2022-03-20 22:27:45,423 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 100 transitions. Word has length 44 [2022-03-20 22:27:45,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:45,423 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 100 transitions. [2022-03-20 22:27:45,424 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-03-20 22:27:45,424 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 100 transitions. [2022-03-20 22:27:45,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 22:27:45,424 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:45,424 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:45,440 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:45,635 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 22:27:45,635 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:45,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:45,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 1 times [2022-03-20 22:27:45,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:45,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1222735905] [2022-03-20 22:27:45,636 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:45,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1114540728, now seen corresponding path program 2 times [2022-03-20 22:27:45,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:45,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1307235861] [2022-03-20 22:27:45,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:45,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:45,650 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:45,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [113654622] [2022-03-20 22:27:45,650 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:45,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:45,650 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:45,651 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:45,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 22:27:45,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:45,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:45,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-20 22:27:45,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:46,145 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 9 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 22:27:46,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:46,291 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:27:46,292 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:46,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1307235861] [2022-03-20 22:27:46,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:46,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [113654622] [2022-03-20 22:27:46,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [113654622] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:46,292 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:46,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-20 22:27:46,292 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:46,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1222735905] [2022-03-20 22:27:46,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1222735905] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:46,292 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:46,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:27:46,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955777807] [2022-03-20 22:27:46,292 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:46,293 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:27:46,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:46,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:27:46,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-03-20 22:27:46,293 INFO L87 Difference]: Start difference. First operand 85 states and 100 transitions. Second operand has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:27:48,770 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:51,622 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:53,003 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.36s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:27:53,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:53,138 INFO L93 Difference]: Finished difference Result 94 states and 109 transitions. [2022-03-20 22:27:53,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 22:27:53,138 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 44 [2022-03-20 22:27:53,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:53,139 INFO L225 Difference]: With dead ends: 94 [2022-03-20 22:27:53,139 INFO L226 Difference]: Without dead ends: 87 [2022-03-20 22:27:53,139 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=101, Invalid=451, Unknown=0, NotChecked=0, Total=552 [2022-03-20 22:27:53,140 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 37 mSDsluCounter, 143 mSDsCounter, 0 mSdLazyCounter, 232 mSolverCounterSat, 11 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 162 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 232 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:53,140 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 162 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 232 Invalid, 2 Unknown, 0 Unchecked, 6.4s Time] [2022-03-20 22:27:53,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-20 22:27:53,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2022-03-20 22:27:53,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 62 states have internal predecessors, (73), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 22:27:53,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 99 transitions. [2022-03-20 22:27:53,150 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 99 transitions. Word has length 44 [2022-03-20 22:27:53,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:53,150 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 99 transitions. [2022-03-20 22:27:53,150 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 12 states have internal predecessors, (27), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:27:53,150 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 99 transitions. [2022-03-20 22:27:53,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 22:27:53,150 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:53,150 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:53,167 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:53,359 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-03-20 22:27:53,359 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:53,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:53,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1195555644, now seen corresponding path program 1 times [2022-03-20 22:27:53,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:53,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [123628099] [2022-03-20 22:27:53,360 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:53,360 INFO L85 PathProgramCache]: Analyzing trace with hash -1195555644, now seen corresponding path program 2 times [2022-03-20 22:27:53,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:53,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665591834] [2022-03-20 22:27:53,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:53,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:53,366 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:53,366 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1676372979] [2022-03-20 22:27:53,366 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:27:53,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:53,367 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:53,367 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:53,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 22:27:53,401 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:27:53,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:53,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 22:27:53,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:27:54,570 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 22:27:54,570 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:27:54,989 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:27:54,989 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:27:54,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665591834] [2022-03-20 22:27:54,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:27:54,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676372979] [2022-03-20 22:27:54,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676372979] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:27:54,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:27:54,989 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 17 [2022-03-20 22:27:54,990 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:27:54,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [123628099] [2022-03-20 22:27:54,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [123628099] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:27:54,990 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:27:54,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 22:27:54,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460566544] [2022-03-20 22:27:54,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:27:54,990 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 22:27:54,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:54,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 22:27:54,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2022-03-20 22:27:54,991 INFO L87 Difference]: Start difference. First operand 85 states and 99 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:27:56,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:27:56,102 INFO L93 Difference]: Finished difference Result 113 states and 138 transitions. [2022-03-20 22:27:56,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 22:27:56,102 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 45 [2022-03-20 22:27:56,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:27:56,103 INFO L225 Difference]: With dead ends: 113 [2022-03-20 22:27:56,103 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 22:27:56,103 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-03-20 22:27:56,104 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 54 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 22:27:56,104 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 161 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-20 22:27:56,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 22:27:56,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 86. [2022-03-20 22:27:56,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 62 states have (on average 1.2096774193548387) internal successors, (75), 63 states have internal predecessors, (75), 14 states have call successors, (14), 10 states have call predecessors, (14), 9 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 22:27:56,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 101 transitions. [2022-03-20 22:27:56,127 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 101 transitions. Word has length 45 [2022-03-20 22:27:56,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:27:56,127 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 101 transitions. [2022-03-20 22:27:56,127 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:27:56,127 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 101 transitions. [2022-03-20 22:27:56,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 22:27:56,127 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:27:56,128 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:27:56,145 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-20 22:27:56,343 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-03-20 22:27:56,343 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:27:56,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:27:56,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 3 times [2022-03-20 22:27:56,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:27:56,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2131974032] [2022-03-20 22:27:56,344 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:27:56,344 INFO L85 PathProgramCache]: Analyzing trace with hash -1506299306, now seen corresponding path program 4 times [2022-03-20 22:27:56,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:27:56,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34220115] [2022-03-20 22:27:56,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:27:56,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:27:56,350 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:27:56,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1046287157] [2022-03-20 22:27:56,350 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:27:56,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:27:56,351 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:27:56,352 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:27:56,352 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 22:27:56,384 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:27:56,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:27:56,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 22:27:56,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:28:14,964 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 22:28:14,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:28:23,966 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 22:28:42,156 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:28:42,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34220115] [2022-03-20 22:28:42,156 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:28:42,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1046287157] [2022-03-20 22:28:42,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1046287157] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 22:28:42,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:28:42,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2022-03-20 22:28:42,157 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:28:42,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2131974032] [2022-03-20 22:28:42,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2131974032] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:28:42,157 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:28:42,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 22:28:42,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373631310] [2022-03-20 22:28:42,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:28:42,157 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 22:28:42,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:28:42,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 22:28:42,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2022-03-20 22:28:42,171 INFO L87 Difference]: Start difference. First operand 86 states and 101 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 22:28:44,569 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:47,308 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:49,310 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:51,313 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:53,315 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:55,318 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:57,320 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:28:58,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:28:58,572 INFO L93 Difference]: Finished difference Result 120 states and 147 transitions. [2022-03-20 22:28:58,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 22:28:58,573 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 45 [2022-03-20 22:28:58,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:28:58,574 INFO L225 Difference]: With dead ends: 120 [2022-03-20 22:28:58,574 INFO L226 Difference]: Without dead ends: 102 [2022-03-20 22:28:58,574 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2022-03-20 22:28:58,574 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 34 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 11 mSolverCounterUnsat, 7 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 15.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 195 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 7 IncrementalHoareTripleChecker+Unknown, 12 IncrementalHoareTripleChecker+Unchecked, 15.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:28:58,574 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 195 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 318 Invalid, 7 Unknown, 12 Unchecked, 15.2s Time] [2022-03-20 22:28:58,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-03-20 22:28:58,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 96. [2022-03-20 22:28:58,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 71 states have internal predecessors, (82), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 22:28:58,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2022-03-20 22:28:58,588 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 45 [2022-03-20 22:28:58,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:28:58,589 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2022-03-20 22:28:58,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 12 states have internal predecessors, (28), 4 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-20 22:28:58,589 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2022-03-20 22:28:58,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 22:28:58,589 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:28:58,589 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:28:58,605 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 22:28:58,796 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 22:28:58,796 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:28:58,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:28:58,797 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 1 times [2022-03-20 22:28:58,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:28:58,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1598483215] [2022-03-20 22:28:58,797 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:28:58,797 INFO L85 PathProgramCache]: Analyzing trace with hash -431044891, now seen corresponding path program 2 times [2022-03-20 22:28:58,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:28:58,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407329088] [2022-03-20 22:28:58,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:28:58,797 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:28:58,803 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:28:58,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1319624273] [2022-03-20 22:28:58,803 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:28:58,803 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:28:58,803 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:28:58,819 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:28:58,820 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 22:28:58,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:28:58,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:28:58,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-20 22:28:58,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:29:00,036 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 22:29:00,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:29:00,658 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:29:00,658 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:29:00,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407329088] [2022-03-20 22:29:00,658 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:29:00,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1319624273] [2022-03-20 22:29:00,658 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1319624273] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:29:00,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:29:00,658 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 18 [2022-03-20 22:29:00,658 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:29:00,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1598483215] [2022-03-20 22:29:00,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1598483215] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:29:00,659 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:29:00,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:29:00,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715529167] [2022-03-20 22:29:00,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:29:00,659 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:29:00,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:29:00,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:29:00,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2022-03-20 22:29:00,659 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:29:00,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:29:00,915 INFO L93 Difference]: Finished difference Result 120 states and 143 transitions. [2022-03-20 22:29:00,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 22:29:00,916 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 46 [2022-03-20 22:29:00,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:29:00,917 INFO L225 Difference]: With dead ends: 120 [2022-03-20 22:29:00,917 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 22:29:00,917 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2022-03-20 22:29:00,918 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:29:00,918 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 172 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 22:29:00,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 22:29:00,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2022-03-20 22:29:00,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 71 states have internal predecessors, (82), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 22:29:00,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 112 transitions. [2022-03-20 22:29:00,930 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 112 transitions. Word has length 46 [2022-03-20 22:29:00,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:29:00,930 INFO L478 AbstractCegarLoop]: Abstraction has 96 states and 112 transitions. [2022-03-20 22:29:00,930 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:29:00,930 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 112 transitions. [2022-03-20 22:29:00,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 22:29:00,931 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:29:00,931 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:29:00,946 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 22:29:01,131 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:29:01,131 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:29:01,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:29:01,132 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 1 times [2022-03-20 22:29:01,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:29:01,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1279123347] [2022-03-20 22:29:01,132 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:29:01,132 INFO L85 PathProgramCache]: Analyzing trace with hash -373786589, now seen corresponding path program 2 times [2022-03-20 22:29:01,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:29:01,132 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561609820] [2022-03-20 22:29:01,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:29:01,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:29:01,138 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:29:01,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1079474709] [2022-03-20 22:29:01,138 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:29:01,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:29:01,138 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:29:01,139 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:29:01,140 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 22:29:01,173 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:29:01,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:29:01,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-20 22:29:01,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:29:01,839 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-03-20 22:29:01,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:29:02,009 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2022-03-20 22:29:02,009 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:29:02,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561609820] [2022-03-20 22:29:02,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:29:02,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079474709] [2022-03-20 22:29:02,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079474709] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:29:02,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:29:02,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 7] total 16 [2022-03-20 22:29:02,010 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:29:02,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1279123347] [2022-03-20 22:29:02,010 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1279123347] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:29:02,010 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:29:02,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 22:29:02,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656738257] [2022-03-20 22:29:02,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:29:02,010 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-20 22:29:02,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:29:02,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-20 22:29:02,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2022-03-20 22:29:02,011 INFO L87 Difference]: Start difference. First operand 96 states and 112 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:29:03,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:29:03,520 INFO L93 Difference]: Finished difference Result 110 states and 130 transitions. [2022-03-20 22:29:03,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-20 22:29:03,520 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-20 22:29:03,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:29:03,521 INFO L225 Difference]: With dead ends: 110 [2022-03-20 22:29:03,521 INFO L226 Difference]: Without dead ends: 108 [2022-03-20 22:29:03,521 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2022-03-20 22:29:03,522 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 39 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 349 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 349 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 22:29:03,522 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 173 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 349 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-20 22:29:03,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2022-03-20 22:29:03,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2022-03-20 22:29:03,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 74 states have (on average 1.1756756756756757) internal successors, (87), 77 states have internal predecessors, (87), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 13 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 22:29:03,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 119 transitions. [2022-03-20 22:29:03,548 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 119 transitions. Word has length 46 [2022-03-20 22:29:03,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:29:03,548 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 119 transitions. [2022-03-20 22:29:03,548 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 12 states have internal predecessors, (29), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:29:03,548 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 119 transitions. [2022-03-20 22:29:03,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 22:29:03,549 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:29:03,549 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:29:03,565 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-03-20 22:29:03,750 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 22:29:03,751 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:29:03,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:29:03,751 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 3 times [2022-03-20 22:29:03,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:29:03,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1181664027] [2022-03-20 22:29:03,751 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:29:03,751 INFO L85 PathProgramCache]: Analyzing trace with hash -160879067, now seen corresponding path program 4 times [2022-03-20 22:29:03,751 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:29:03,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752579719] [2022-03-20 22:29:03,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:29:03,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:29:03,756 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:29:03,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1215817197] [2022-03-20 22:29:03,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:29:03,757 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:29:03,757 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:29:03,758 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:29:03,759 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 22:29:03,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:29:03,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:29:03,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 22:29:03,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:29:04,420 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 22:29:04,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:29:27,075 WARN L232 SmtUtils]: Spent 6.05s on a formula simplification that was a NOOP. DAG size: 40 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-20 22:33:01,265 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-03-20 22:33:01,266 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:01,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752579719] [2022-03-20 22:33:01,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:01,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215817197] [2022-03-20 22:33:01,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215817197] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:33:01,266 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:33:01,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 10] total 20 [2022-03-20 22:33:01,266 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:01,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1181664027] [2022-03-20 22:33:01,266 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1181664027] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:01,266 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:01,266 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:33:01,266 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806940312] [2022-03-20 22:33:01,266 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:01,267 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:33:01,267 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:01,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:33:01,267 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=312, Unknown=1, NotChecked=0, Total=380 [2022-03-20 22:33:01,267 INFO L87 Difference]: Start difference. First operand 103 states and 119 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:33:01,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:01,577 INFO L93 Difference]: Finished difference Result 129 states and 154 transitions. [2022-03-20 22:33:01,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 22:33:01,577 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 46 [2022-03-20 22:33:01,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:01,578 INFO L225 Difference]: With dead ends: 129 [2022-03-20 22:33:01,578 INFO L226 Difference]: Without dead ends: 112 [2022-03-20 22:33:01,578 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 72 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=84, Invalid=421, Unknown=1, NotChecked=0, Total=506 [2022-03-20 22:33:01,579 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 46 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:01,579 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 171 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 22:33:01,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-03-20 22:33:01,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 100. [2022-03-20 22:33:01,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 71 states have (on average 1.1690140845070423) internal successors, (83), 75 states have internal predecessors, (83), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 12 states have call predecessors, (15), 15 states have call successors, (15) [2022-03-20 22:33:01,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 115 transitions. [2022-03-20 22:33:01,593 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 115 transitions. Word has length 46 [2022-03-20 22:33:01,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:01,593 INFO L478 AbstractCegarLoop]: Abstraction has 100 states and 115 transitions. [2022-03-20 22:33:01,593 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-03-20 22:33:01,593 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 115 transitions. [2022-03-20 22:33:01,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-20 22:33:01,594 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:01,594 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:01,625 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:01,803 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 22:33:01,803 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:01,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:01,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 3 times [2022-03-20 22:33:01,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:01,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [248732675] [2022-03-20 22:33:01,804 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:01,804 INFO L85 PathProgramCache]: Analyzing trace with hash -1171996317, now seen corresponding path program 4 times [2022-03-20 22:33:01,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:01,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709188551] [2022-03-20 22:33:01,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:01,804 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:01,809 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:01,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1926069697] [2022-03-20 22:33:01,809 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:33:01,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:01,810 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:01,824 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:01,825 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 22:33:01,878 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:33:01,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:01,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-20 22:33:01,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:05,214 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 5 proven. 13 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-03-20 22:33:05,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:20,591 WARN L855 $PredicateComparison]: unable to prove that (let ((.cse1 (* c_main_~b~0 c_main_~p~0 c_main_~a~0))) (or (= (let ((.cse0 (div (+ (- 1) c_main_~a~0) 2))) (+ (* c_main_~p~0 c_main_~a~0) (* (* (div (+ (- 1) c_main_~b~0) 2) c_main_~p~0 .cse0) 4) (* (* c_main_~p~0 .cse0) 4) (* c_main_~b~0 c_main_~p~0))) (+ c_main_~p~0 .cse1)) (not (= (+ c_main_~q~0 .cse1) (* c_main_~x~0 c_main_~y~0))) (not (= (mod (+ c_main_~a~0 1) 2) 0)) (= (mod (+ c_main_~b~0 1) 2) 0) (<= 1 c_main_~b~0))) is different from true [2022-03-20 22:33:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 7 trivial. 4 not checked. [2022-03-20 22:33:22,246 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:22,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709188551] [2022-03-20 22:33:22,246 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:22,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926069697] [2022-03-20 22:33:22,246 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926069697] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:33:22,246 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:33:22,246 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 24 [2022-03-20 22:33:22,247 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:22,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [248732675] [2022-03-20 22:33:22,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [248732675] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:22,247 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:22,247 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:33:22,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138540975] [2022-03-20 22:33:22,247 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:22,247 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:33:22,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:22,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:33:22,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=412, Unknown=1, NotChecked=42, Total=552 [2022-03-20 22:33:22,248 INFO L87 Difference]: Start difference. First operand 100 states and 115 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:33:23,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:23,087 INFO L93 Difference]: Finished difference Result 112 states and 130 transitions. [2022-03-20 22:33:23,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 22:33:23,087 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) Word has length 46 [2022-03-20 22:33:23,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:23,088 INFO L225 Difference]: With dead ends: 112 [2022-03-20 22:33:23,088 INFO L226 Difference]: Without dead ends: 110 [2022-03-20 22:33:23,088 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=115, Invalid=538, Unknown=1, NotChecked=48, Total=702 [2022-03-20 22:33:23,088 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 32 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:23,089 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 201 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 22:33:23,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-03-20 22:33:23,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 92. [2022-03-20 22:33:23,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.1846153846153846) internal successors, (77), 69 states have internal predecessors, (77), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (14), 11 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-20 22:33:23,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2022-03-20 22:33:23,102 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 46 [2022-03-20 22:33:23,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:23,102 INFO L478 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2022-03-20 22:33:23,102 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 13 states have internal predecessors, (26), 5 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 5 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 22:33:23,102 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2022-03-20 22:33:23,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-20 22:33:23,102 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:23,102 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:23,118 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:23,306 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 22:33:23,306 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:23,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:23,307 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 1 times [2022-03-20 22:33:23,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:23,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [946114664] [2022-03-20 22:33:23,307 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:23,307 INFO L85 PathProgramCache]: Analyzing trace with hash 2079436449, now seen corresponding path program 2 times [2022-03-20 22:33:23,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:23,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803633967] [2022-03-20 22:33:23,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:23,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:23,315 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:23,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1709150603] [2022-03-20 22:33:23,315 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:33:23,315 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:23,316 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:23,316 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:23,317 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 22:33:23,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:33:23,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:23,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 22:33:23,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:24,401 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-20 22:33:24,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:24,604 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 13 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 22:33:24,604 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:24,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803633967] [2022-03-20 22:33:24,604 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:24,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1709150603] [2022-03-20 22:33:24,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1709150603] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:33:24,604 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:33:24,604 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 8] total 20 [2022-03-20 22:33:24,605 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:24,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [946114664] [2022-03-20 22:33:24,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [946114664] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:24,605 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:24,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-20 22:33:24,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84290466] [2022-03-20 22:33:24,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:24,605 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-20 22:33:24,605 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:24,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-20 22:33:24,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2022-03-20 22:33:24,606 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 22:33:26,714 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:29,041 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:30,504 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.44s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:33,085 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:33,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:33,241 INFO L93 Difference]: Finished difference Result 138 states and 171 transitions. [2022-03-20 22:33:33,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-20 22:33:33,243 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 52 [2022-03-20 22:33:33,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:33,243 INFO L225 Difference]: With dead ends: 138 [2022-03-20 22:33:33,243 INFO L226 Difference]: Without dead ends: 114 [2022-03-20 22:33:33,245 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=468, Unknown=0, NotChecked=0, Total=552 [2022-03-20 22:33:33,245 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 41 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 18 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:33,245 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 294 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 450 Invalid, 3 Unknown, 0 Unchecked, 8.6s Time] [2022-03-20 22:33:33,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-03-20 22:33:33,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 106. [2022-03-20 22:33:33,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 75 states have (on average 1.1866666666666668) internal successors, (89), 81 states have internal predecessors, (89), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (18), 13 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 22:33:33,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 127 transitions. [2022-03-20 22:33:33,265 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 127 transitions. Word has length 52 [2022-03-20 22:33:33,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:33,265 INFO L478 AbstractCegarLoop]: Abstraction has 106 states and 127 transitions. [2022-03-20 22:33:33,265 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.875) internal successors, (30), 15 states have internal predecessors, (30), 6 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-03-20 22:33:33,266 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 127 transitions. [2022-03-20 22:33:33,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-20 22:33:33,267 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:33,267 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:33,289 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:33,479 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:33,480 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:33,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:33,480 INFO L85 PathProgramCache]: Analyzing trace with hash 967008175, now seen corresponding path program 5 times [2022-03-20 22:33:33,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:33,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1848734521] [2022-03-20 22:33:33,480 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:33,480 INFO L85 PathProgramCache]: Analyzing trace with hash 967008175, now seen corresponding path program 6 times [2022-03-20 22:33:33,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:33,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173516769] [2022-03-20 22:33:33,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:33,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:33,487 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:33,487 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1314854439] [2022-03-20 22:33:33,487 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 22:33:33,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:33,487 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:33,488 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:33,514 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 22:33:33,525 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 22:33:33,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:33,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-20 22:33:33,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:33,590 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-20 22:33:33,714 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 22:33:33,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:33,869 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-03-20 22:33:33,869 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:33,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173516769] [2022-03-20 22:33:33,869 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:33,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314854439] [2022-03-20 22:33:33,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314854439] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:33:33,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:33:33,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-20 22:33:33,870 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:33,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1848734521] [2022-03-20 22:33:33,870 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1848734521] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:33,870 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:33,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 22:33:33,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491537782] [2022-03-20 22:33:33,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:33,870 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 22:33:33,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:33,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 22:33:33,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 22:33:33,871 INFO L87 Difference]: Start difference. First operand 106 states and 127 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-03-20 22:33:35,945 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:38,022 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:40,070 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:40,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:40,949 INFO L93 Difference]: Finished difference Result 128 states and 156 transitions. [2022-03-20 22:33:40,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 22:33:40,949 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) Word has length 53 [2022-03-20 22:33:40,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:40,950 INFO L225 Difference]: With dead ends: 128 [2022-03-20 22:33:40,950 INFO L226 Difference]: Without dead ends: 124 [2022-03-20 22:33:40,950 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 96 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-20 22:33:40,951 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 19 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 8 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.0s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:40,951 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 147 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 118 Invalid, 3 Unknown, 0 Unchecked, 7.0s Time] [2022-03-20 22:33:40,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-03-20 22:33:40,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 108. [2022-03-20 22:33:40,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 77 states have (on average 1.1688311688311688) internal successors, (90), 82 states have internal predecessors, (90), 20 states have call successors, (20), 12 states have call predecessors, (20), 10 states have return successors, (18), 13 states have call predecessors, (18), 18 states have call successors, (18) [2022-03-20 22:33:40,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 128 transitions. [2022-03-20 22:33:40,972 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 128 transitions. Word has length 53 [2022-03-20 22:33:40,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:40,972 INFO L478 AbstractCegarLoop]: Abstraction has 108 states and 128 transitions. [2022-03-20 22:33:40,972 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (6), 2 states have call predecessors, (6), 1 states have call successors, (6) [2022-03-20 22:33:40,972 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 128 transitions. [2022-03-20 22:33:40,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-03-20 22:33:40,973 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:40,973 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:40,993 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:41,187 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:41,187 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:41,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:41,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1563197702, now seen corresponding path program 3 times [2022-03-20 22:33:41,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:41,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1110419961] [2022-03-20 22:33:41,188 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:41,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1563197702, now seen corresponding path program 4 times [2022-03-20 22:33:41,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:41,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27654248] [2022-03-20 22:33:41,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:41,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:41,193 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:41,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [384858077] [2022-03-20 22:33:41,193 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:33:41,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:41,193 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:41,195 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:41,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 22:33:41,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:33:41,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:41,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 22:33:41,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:41,743 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 22:33:41,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:41,853 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:41,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27654248] [2022-03-20 22:33:41,853 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:41,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384858077] [2022-03-20 22:33:41,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384858077] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 22:33:41,853 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:33:41,853 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2022-03-20 22:33:41,854 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:41,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1110419961] [2022-03-20 22:33:41,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1110419961] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:41,854 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:41,854 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 22:33:41,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280959136] [2022-03-20 22:33:41,854 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:41,854 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 22:33:41,854 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:41,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 22:33:41,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2022-03-20 22:33:41,855 INFO L87 Difference]: Start difference. First operand 108 states and 128 transitions. Second operand has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 22:33:42,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:42,142 INFO L93 Difference]: Finished difference Result 156 states and 193 transitions. [2022-03-20 22:33:42,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 22:33:42,143 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 60 [2022-03-20 22:33:42,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:42,143 INFO L225 Difference]: With dead ends: 156 [2022-03-20 22:33:42,143 INFO L226 Difference]: Without dead ends: 135 [2022-03-20 22:33:42,144 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-03-20 22:33:42,144 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 49 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:42,144 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 192 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 339 Invalid, 0 Unknown, 32 Unchecked, 0.2s Time] [2022-03-20 22:33:42,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-03-20 22:33:42,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 127. [2022-03-20 22:33:42,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 93 states have (on average 1.1827956989247312) internal successors, (110), 97 states have internal predecessors, (110), 23 states have call successors, (23), 12 states have call predecessors, (23), 10 states have return successors, (21), 17 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-20 22:33:42,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 154 transitions. [2022-03-20 22:33:42,174 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 154 transitions. Word has length 60 [2022-03-20 22:33:42,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:42,174 INFO L478 AbstractCegarLoop]: Abstraction has 127 states and 154 transitions. [2022-03-20 22:33:42,174 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 2.357142857142857) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 22:33:42,174 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 154 transitions. [2022-03-20 22:33:42,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 22:33:42,175 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:42,175 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:42,191 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:42,379 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-03-20 22:33:42,379 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:42,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:42,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1755220788, now seen corresponding path program 1 times [2022-03-20 22:33:42,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:42,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2021821385] [2022-03-20 22:33:42,380 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:42,380 INFO L85 PathProgramCache]: Analyzing trace with hash 1755220788, now seen corresponding path program 2 times [2022-03-20 22:33:42,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:42,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857979681] [2022-03-20 22:33:42,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:42,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:42,385 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:42,385 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [423825364] [2022-03-20 22:33:42,385 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 22:33:42,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:42,385 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:42,386 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:42,387 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-20 22:33:42,420 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 22:33:42,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:42,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 22:33:42,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:42,544 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-20 22:33:42,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:42,663 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-03-20 22:33:42,663 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:42,663 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857979681] [2022-03-20 22:33:42,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:42,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423825364] [2022-03-20 22:33:42,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423825364] provided 1 perfect and 1 imperfect interpolant sequences [2022-03-20 22:33:42,664 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:33:42,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 6 [2022-03-20 22:33:42,664 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:42,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2021821385] [2022-03-20 22:33:42,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2021821385] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:42,664 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:42,664 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 22:33:42,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067485794] [2022-03-20 22:33:42,664 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:42,665 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 22:33:42,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:42,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 22:33:42,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-20 22:33:42,666 INFO L87 Difference]: Start difference. First operand 127 states and 154 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 22:33:42,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:42,726 INFO L93 Difference]: Finished difference Result 173 states and 219 transitions. [2022-03-20 22:33:42,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 22:33:42,727 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 61 [2022-03-20 22:33:42,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:42,729 INFO L225 Difference]: With dead ends: 173 [2022-03-20 22:33:42,729 INFO L226 Difference]: Without dead ends: 143 [2022-03-20 22:33:42,729 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-03-20 22:33:42,730 INFO L913 BasicCegarLoop]: 37 mSDtfsCounter, 1 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:42,730 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 88 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 22:33:42,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-03-20 22:33:42,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 141. [2022-03-20 22:33:42,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.180952380952381) internal successors, (124), 107 states have internal predecessors, (124), 25 states have call successors, (25), 12 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 22:33:42,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2022-03-20 22:33:42,776 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 61 [2022-03-20 22:33:42,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:42,776 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2022-03-20 22:33:42,776 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-03-20 22:33:42,776 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2022-03-20 22:33:42,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-20 22:33:42,776 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:42,777 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:42,792 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-20 22:33:42,979 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 22:33:42,979 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:42,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:42,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1988072646, now seen corresponding path program 3 times [2022-03-20 22:33:42,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:42,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1641581277] [2022-03-20 22:33:42,980 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:42,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1988072646, now seen corresponding path program 4 times [2022-03-20 22:33:42,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:42,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393989677] [2022-03-20 22:33:42,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:42,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:42,987 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:42,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [57228479] [2022-03-20 22:33:42,987 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-20 22:33:42,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:42,987 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:42,988 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:42,989 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-20 22:33:43,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-20 22:33:43,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:43,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 22:33:43,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:43,580 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 26 proven. 19 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-03-20 22:33:43,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:43,741 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:43,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393989677] [2022-03-20 22:33:43,742 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:43,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57228479] [2022-03-20 22:33:43,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57228479] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 22:33:43,742 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-03-20 22:33:43,742 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2022-03-20 22:33:43,742 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:43,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1641581277] [2022-03-20 22:33:43,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1641581277] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:43,742 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:43,742 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 22:33:43,742 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410084112] [2022-03-20 22:33:43,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:43,742 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-20 22:33:43,743 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:43,743 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-20 22:33:43,743 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=353, Unknown=0, NotChecked=0, Total=420 [2022-03-20 22:33:43,743 INFO L87 Difference]: Start difference. First operand 141 states and 172 transitions. Second operand has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 22:33:44,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:44,262 INFO L93 Difference]: Finished difference Result 153 states and 187 transitions. [2022-03-20 22:33:44,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 22:33:44,263 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) Word has length 61 [2022-03-20 22:33:44,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:44,263 INFO L225 Difference]: With dead ends: 153 [2022-03-20 22:33:44,263 INFO L226 Difference]: Without dead ends: 148 [2022-03-20 22:33:44,264 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-03-20 22:33:44,264 INFO L913 BasicCegarLoop]: 24 mSDtfsCounter, 38 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 331 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 331 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:44,264 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 182 Invalid, 376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 331 Invalid, 0 Unknown, 27 Unchecked, 0.3s Time] [2022-03-20 22:33:44,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-03-20 22:33:44,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-03-20 22:33:44,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 105 states have (on average 1.180952380952381) internal successors, (124), 107 states have internal predecessors, (124), 25 states have call successors, (25), 12 states have call predecessors, (25), 10 states have return successors, (23), 21 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 22:33:44,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 172 transitions. [2022-03-20 22:33:44,300 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 172 transitions. Word has length 61 [2022-03-20 22:33:44,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:44,300 INFO L478 AbstractCegarLoop]: Abstraction has 141 states and 172 transitions. [2022-03-20 22:33:44,300 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 16 states have internal predecessors, (34), 7 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 7 states have call predecessors, (8), 6 states have call successors, (8) [2022-03-20 22:33:44,301 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 172 transitions. [2022-03-20 22:33:44,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-03-20 22:33:44,301 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 22:33:44,301 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 22:33:44,317 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:44,517 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:44,517 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 22:33:44,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 22:33:44,518 INFO L85 PathProgramCache]: Analyzing trace with hash 165486739, now seen corresponding path program 5 times [2022-03-20 22:33:44,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:44,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1997668028] [2022-03-20 22:33:44,518 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 22:33:44,518 INFO L85 PathProgramCache]: Analyzing trace with hash 165486739, now seen corresponding path program 6 times [2022-03-20 22:33:44,518 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 22:33:44,518 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737768616] [2022-03-20 22:33:44,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 22:33:44,518 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 22:33:44,523 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 22:33:44,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [934022824] [2022-03-20 22:33:44,523 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-20 22:33:44,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:44,523 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 22:33:44,526 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 22:33:44,533 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-20 22:33:44,570 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-20 22:33:44,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 22:33:44,571 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 22:33:44,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 22:33:44,685 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-03-20 22:33:44,686 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 22:33:44,823 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2022-03-20 22:33:44,823 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 22:33:44,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737768616] [2022-03-20 22:33:44,823 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 22:33:44,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934022824] [2022-03-20 22:33:44,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934022824] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 22:33:44,823 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 22:33:44,823 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-20 22:33:44,823 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 22:33:44,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1997668028] [2022-03-20 22:33:44,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1997668028] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 22:33:44,823 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 22:33:44,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-20 22:33:44,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692526768] [2022-03-20 22:33:44,824 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 22:33:44,824 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 22:33:44,824 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 22:33:44,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 22:33:44,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-03-20 22:33:44,824 INFO L87 Difference]: Start difference. First operand 141 states and 172 transitions. Second operand has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2022-03-20 22:33:46,923 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2022-03-20 22:33:47,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 22:33:47,614 INFO L93 Difference]: Finished difference Result 141 states and 172 transitions. [2022-03-20 22:33:47,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 22:33:47,614 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) Word has length 62 [2022-03-20 22:33:47,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 22:33:47,614 INFO L225 Difference]: With dead ends: 141 [2022-03-20 22:33:47,614 INFO L226 Difference]: Without dead ends: 0 [2022-03-20 22:33:47,615 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 114 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-20 22:33:47,615 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 9 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-03-20 22:33:47,615 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 118 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2022-03-20 22:33:47,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-03-20 22:33:47,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-03-20 22:33:47,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-03-20 22:33:47,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-03-20 22:33:47,616 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2022-03-20 22:33:47,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 22:33:47,616 INFO L478 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-03-20 22:33:47,616 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 6 states have internal predecessors, (24), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 1 states have call successors, (7) [2022-03-20 22:33:47,616 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-03-20 22:33:47,616 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-03-20 22:33:47,618 INFO L788 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 22:33:47,634 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-20 22:33:47,818 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 22:33:47,820 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.