/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/cohendiv-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 09:41:20,909 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 09:41:20,910 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 09:41:20,985 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 09:41:21,041 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 09:41:21,043 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 09:41:21,044 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 09:41:21,045 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 09:41:21,056 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 09:41:21,057 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 09:41:21,058 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 09:41:21,058 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 09:41:21,059 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 09:41:21,059 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 09:41:21,059 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 09:41:21,059 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 09:41:21,059 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 09:41:21,060 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 09:41:21,060 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 09:41:21,061 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 09:41:21,061 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 09:41:21,061 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 09:41:21,061 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 09:41:21,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:41:21,061 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 09:41:21,061 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 09:41:21,062 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 09:41:21,062 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 09:41:21,062 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 09:41:21,062 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 09:41:21,062 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 09:41:21,251 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 09:41:21,274 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 09:41:21,276 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 09:41:21,277 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 09:41:21,278 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 09:41:21,278 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound50.c [2022-03-19 09:41:21,329 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c655bfe0e/33cc5ae49a0b45f197df260ffb50c886/FLAGd6d2a70de [2022-03-19 09:41:21,684 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 09:41:21,684 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound50.c [2022-03-19 09:41:21,689 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c655bfe0e/33cc5ae49a0b45f197df260ffb50c886/FLAGd6d2a70de [2022-03-19 09:41:21,701 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c655bfe0e/33cc5ae49a0b45f197df260ffb50c886 [2022-03-19 09:41:21,703 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 09:41:21,704 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 09:41:21,705 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 09:41:21,705 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 09:41:21,707 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 09:41:21,708 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,709 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72389fc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21, skipping insertion in model container [2022-03-19 09:41:21,709 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,713 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 09:41:21,724 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 09:41:21,851 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/cohendiv-ll_unwindbound50.c[576,589] [2022-03-19 09:41:21,875 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:41:21,881 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 09:41:21,890 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/cohendiv-ll_unwindbound50.c[576,589] [2022-03-19 09:41:21,896 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:41:21,906 INFO L208 MainTranslator]: Completed translation [2022-03-19 09:41:21,906 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21 WrapperNode [2022-03-19 09:41:21,906 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 09:41:21,907 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 09:41:21,907 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 09:41:21,908 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 09:41:21,916 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,916 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,920 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,921 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,924 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,927 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,928 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,930 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 09:41:21,931 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 09:41:21,931 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 09:41:21,931 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 09:41:21,932 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (1/1) ... [2022-03-19 09:41:21,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:41:21,945 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:21,956 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) [2022-03-19 09:41:21,979 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 [2022-03-19 09:41:21,994 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 09:41:21,994 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 09:41:21,994 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 09:41:21,994 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-19 09:41:21,995 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 09:41:21,995 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 09:41:21,995 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-19 09:41:21,996 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 09:41:21,997 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 09:41:21,997 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 09:41:21,999 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 09:41:21,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 09:41:21,999 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 09:41:21,999 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 09:41:21,999 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 09:41:22,057 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 09:41:22,058 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 09:41:22,226 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 09:41:22,231 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 09:41:22,232 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-19 09:41:22,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:41:22 BoogieIcfgContainer [2022-03-19 09:41:22,233 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 09:41:22,235 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 09:41:22,235 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 09:41:22,238 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 09:41:22,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 09:41:21" (1/3) ... [2022-03-19 09:41:22,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e178b0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:41:22, skipping insertion in model container [2022-03-19 09:41:22,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:41:21" (2/3) ... [2022-03-19 09:41:22,240 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e178b0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:41:22, skipping insertion in model container [2022-03-19 09:41:22,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:41:22" (3/3) ... [2022-03-19 09:41:22,241 INFO L111 eAbstractionObserver]: Analyzing ICFG cohendiv-ll_unwindbound50.c [2022-03-19 09:41:22,245 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 09:41:22,245 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 09:41:22,283 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 09:41:22,289 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 [2022-03-19 09:41:22,289 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 09:41:22,300 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-19 09:41:22,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 09:41:22,307 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:22,307 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:41:22,308 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:22,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:22,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1588022502, now seen corresponding path program 1 times [2022-03-19 09:41:22,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:22,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1399231980] [2022-03-19 09:41:22,326 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:41:22,326 INFO L85 PathProgramCache]: Analyzing trace with hash -1588022502, now seen corresponding path program 2 times [2022-03-19 09:41:22,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:22,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [58222557] [2022-03-19 09:41:22,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:22,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:22,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:41:22,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 09:41:22,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:41:22,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-19 09:41:22,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:41:22,470 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:41:22,471 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:22,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [58222557] [2022-03-19 09:41:22,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [58222557] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:22,472 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:22,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:41:22,474 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:41:22,475 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1399231980] [2022-03-19 09:41:22,475 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1399231980] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:22,476 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:22,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:41:22,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136585851] [2022-03-19 09:41:22,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:41:22,481 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 09:41:22,481 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:22,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 09:41:22,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 09:41:22,510 INFO L87 Difference]: Start difference. First operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:41:22,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:41:22,633 INFO L93 Difference]: Finished difference Result 68 states and 101 transitions. [2022-03-19 09:41:22,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 09:41:22,635 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-19 09:41:22,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:41:22,644 INFO L225 Difference]: With dead ends: 68 [2022-03-19 09:41:22,644 INFO L226 Difference]: Without dead ends: 34 [2022-03-19 09:41:22,648 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 09:41:22,652 INFO L912 BasicCegarLoop]: 45 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:41:22,654 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 49 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:41:22,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-19 09:41:22,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-03-19 09:41:22,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-19 09:41:22,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2022-03-19 09:41:22,709 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 17 [2022-03-19 09:41:22,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:41:22,710 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2022-03-19 09:41:22,710 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:41:22,710 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2022-03-19 09:41:22,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 09:41:22,711 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:22,711 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:41:22,711 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 09:41:22,712 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:22,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:22,714 INFO L85 PathProgramCache]: Analyzing trace with hash 766070672, now seen corresponding path program 1 times [2022-03-19 09:41:22,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:22,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1659169761] [2022-03-19 09:41:22,718 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:41:22,718 INFO L85 PathProgramCache]: Analyzing trace with hash 766070672, now seen corresponding path program 2 times [2022-03-19 09:41:22,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:22,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616898912] [2022-03-19 09:41:22,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:22,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:22,755 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:41:22,756 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [394588574] [2022-03-19 09:41:22,756 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:41:22,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:41:22,756 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:22,763 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) [2022-03-19 09:41:22,765 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 09:41:22,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-19 09:41:22,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:41:22,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-19 09:41:22,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:41:22,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:41:22,895 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:41:22,896 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:22,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616898912] [2022-03-19 09:41:22,896 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:41:22,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394588574] [2022-03-19 09:41:22,897 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394588574] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:22,897 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:22,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 09:41:22,898 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:41:22,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1659169761] [2022-03-19 09:41:22,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1659169761] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:22,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:22,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 09:41:22,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094119425] [2022-03-19 09:41:22,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:41:22,899 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 09:41:22,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:22,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 09:41:22,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 09:41:22,900 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 09:41:22,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:41:22,916 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2022-03-19 09:41:22,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 09:41:22,916 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2022-03-19 09:41:22,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:41:22,917 INFO L225 Difference]: With dead ends: 42 [2022-03-19 09:41:22,917 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 09:41:22,918 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 09:41:22,919 INFO L912 BasicCegarLoop]: 40 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:41:22,919 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 107 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:41:22,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 09:41:22,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-19 09:41:22,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-19 09:41:22,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2022-03-19 09:41:22,928 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 18 [2022-03-19 09:41:22,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:41:22,928 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2022-03-19 09:41:22,928 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-19 09:41:22,928 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2022-03-19 09:41:22,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 09:41:22,929 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:22,929 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:41:22,952 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-03-19 09:41:23,150 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 [2022-03-19 09:41:23,151 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:23,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:23,152 INFO L85 PathProgramCache]: Analyzing trace with hash 767560222, now seen corresponding path program 1 times [2022-03-19 09:41:23,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:23,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [257942188] [2022-03-19 09:41:23,152 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:41:23,152 INFO L85 PathProgramCache]: Analyzing trace with hash 767560222, now seen corresponding path program 2 times [2022-03-19 09:41:23,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:23,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1199822171] [2022-03-19 09:41:23,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:23,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:23,166 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:41:23,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1007557817] [2022-03-19 09:41:23,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:41:23,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:41:23,167 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:23,172 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) [2022-03-19 09:41:23,206 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 09:41:23,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-19 09:41:23,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:41:23,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 09:41:23,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:41:23,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:41:23,305 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:41:23,305 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:23,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1199822171] [2022-03-19 09:41:23,305 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:41:23,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007557817] [2022-03-19 09:41:23,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007557817] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:23,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:23,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:23,306 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:41:23,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [257942188] [2022-03-19 09:41:23,306 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [257942188] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:23,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:23,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:23,307 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [808372932] [2022-03-19 09:41:23,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:41:23,307 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:41:23,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:23,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:41:23,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:41:23,308 INFO L87 Difference]: Start difference. First operand 35 states and 44 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:41:23,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:41:23,361 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2022-03-19 09:41:23,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:41:23,362 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-03-19 09:41:23,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:41:23,363 INFO L225 Difference]: With dead ends: 45 [2022-03-19 09:41:23,363 INFO L226 Difference]: Without dead ends: 43 [2022-03-19 09:41:23,363 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-19 09:41:23,364 INFO L912 BasicCegarLoop]: 41 mSDtfsCounter, 6 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:41:23,365 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 149 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:41:23,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-19 09:41:23,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2022-03-19 09:41:23,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-19 09:41:23,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2022-03-19 09:41:23,373 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 18 [2022-03-19 09:41:23,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:41:23,373 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2022-03-19 09:41:23,373 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, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:41:23,374 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2022-03-19 09:41:23,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 09:41:23,374 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:23,374 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:41:23,402 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 09:41:23,599 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 [2022-03-19 09:41:23,600 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:23,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:23,600 INFO L85 PathProgramCache]: Analyzing trace with hash -1016228092, now seen corresponding path program 1 times [2022-03-19 09:41:23,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:23,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [597842144] [2022-03-19 09:41:23,601 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:41:23,601 INFO L85 PathProgramCache]: Analyzing trace with hash -1016228092, now seen corresponding path program 2 times [2022-03-19 09:41:23,601 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:23,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711005432] [2022-03-19 09:41:23,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:23,601 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:23,612 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:41:23,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1725088128] [2022-03-19 09:41:23,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:41:23,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:41:23,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:23,613 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) [2022-03-19 09:41:23,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 09:41:23,649 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:41:23,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:41:23,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 09:41:23,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:41:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:41:23,723 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:41:23,724 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711005432] [2022-03-19 09:41:23,724 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:41:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725088128] [2022-03-19 09:41:23,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725088128] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:23,724 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:23,724 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:23,725 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:41:23,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [597842144] [2022-03-19 09:41:23,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [597842144] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:23,731 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:23,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:23,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894928833] [2022-03-19 09:41:23,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:41:23,735 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:41:23,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:23,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:41:23,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:41:23,736 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-19 09:41:23,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:41:23,782 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2022-03-19 09:41:23,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:41:23,783 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2022-03-19 09:41:23,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:41:23,784 INFO L225 Difference]: With dead ends: 58 [2022-03-19 09:41:23,784 INFO L226 Difference]: Without dead ends: 55 [2022-03-19 09:41:23,784 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-19 09:41:23,785 INFO L912 BasicCegarLoop]: 42 mSDtfsCounter, 13 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:41:23,786 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 149 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:41:23,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-19 09:41:23,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2022-03-19 09:41:23,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-19 09:41:23,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2022-03-19 09:41:23,797 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 23 [2022-03-19 09:41:23,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:41:23,797 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2022-03-19 09:41:23,797 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-19 09:41:23,798 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2022-03-19 09:41:23,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 09:41:23,798 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:23,798 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:41:23,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 09:41:24,011 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 [2022-03-19 09:41:24,012 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:24,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:24,012 INFO L85 PathProgramCache]: Analyzing trace with hash 2019703110, now seen corresponding path program 1 times [2022-03-19 09:41:24,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:24,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [644732585] [2022-03-19 09:41:24,013 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:41:24,013 INFO L85 PathProgramCache]: Analyzing trace with hash 2019703110, now seen corresponding path program 2 times [2022-03-19 09:41:24,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:24,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396863822] [2022-03-19 09:41:24,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:24,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:24,024 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:41:24,024 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [849573086] [2022-03-19 09:41:24,024 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:41:24,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:41:24,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:24,026 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) [2022-03-19 09:41:24,067 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 09:41:24,083 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:41:24,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:41:24,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 09:41:24,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:41:24,174 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-19 09:41:24,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:41:24,174 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:24,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396863822] [2022-03-19 09:41:24,176 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:41:24,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849573086] [2022-03-19 09:41:24,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849573086] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:24,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:24,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:24,177 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:41:24,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [644732585] [2022-03-19 09:41:24,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [644732585] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:41:24,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:41:24,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:41:24,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023241180] [2022-03-19 09:41:24,178 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:41:24,178 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:41:24,178 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:24,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:41:24,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:41:24,179 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (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) [2022-03-19 09:41:24,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:41:24,257 INFO L93 Difference]: Finished difference Result 83 states and 113 transitions. [2022-03-19 09:41:24,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:41:24,258 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (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 31 [2022-03-19 09:41:24,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:41:24,260 INFO L225 Difference]: With dead ends: 83 [2022-03-19 09:41:24,260 INFO L226 Difference]: Without dead ends: 81 [2022-03-19 09:41:24,260 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-19 09:41:24,261 INFO L912 BasicCegarLoop]: 46 mSDtfsCounter, 13 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:41:24,261 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 160 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:41:24,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-19 09:41:24,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-03-19 09:41:24,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 46 states have internal predecessors, (56), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 09:41:24,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 100 transitions. [2022-03-19 09:41:24,277 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 100 transitions. Word has length 31 [2022-03-19 09:41:24,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:41:24,277 INFO L478 AbstractCegarLoop]: Abstraction has 74 states and 100 transitions. [2022-03-19 09:41:24,277 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (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) [2022-03-19 09:41:24,277 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 100 transitions. [2022-03-19 09:41:24,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 09:41:24,278 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:41:24,278 INFO L500 BasicCegarLoop]: trace histogram [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, 1, 1] [2022-03-19 09:41:24,306 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 09:41:24,503 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 [2022-03-19 09:41:24,504 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:41:24,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:41:24,504 INFO L85 PathProgramCache]: Analyzing trace with hash 202176206, now seen corresponding path program 1 times [2022-03-19 09:41:24,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:41:24,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1032381041] [2022-03-19 09:50:30,215 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 09:50:30,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1923851590, now seen corresponding path program 1 times [2022-03-19 09:50:30,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:50:30,217 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940709564] [2022-03-19 09:50:30,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:50:30,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:50:30,226 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:50:30,227 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [273080087] [2022-03-19 09:50:30,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:50:30,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:50:30,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:50:30,239 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) [2022-03-19 09:50:30,250 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 09:50:30,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:50:30,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 09:50:30,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:50:30,325 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:50:30,326 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:50:30,326 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:50:30,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940709564] [2022-03-19 09:50:30,326 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:50:30,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273080087] [2022-03-19 09:50:30,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273080087] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:50:30,326 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:50:30,326 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 09:50:30,427 WARN L907 QuantifierPusher]: no eliminatee completely removed, nonetheless the elimination was considered successful [2022-03-19 09:50:30,726 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:50:30,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1032381041] [2022-03-19 09:50:30,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1032381041] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:50:30,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:50:30,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 09:50:30,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085144448] [2022-03-19 09:50:30,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:50:30,727 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 09:50:30,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:30,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 09:50:30,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2022-03-19 09:50:30,728 INFO L87 Difference]: Start difference. First operand 74 states and 100 transitions. Second operand has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-19 09:50:32,784 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 [] [2022-03-19 09:50:34,854 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 [] [2022-03-19 09:50:34,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:50:34,951 INFO L93 Difference]: Finished difference Result 113 states and 153 transitions. [2022-03-19 09:50:34,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 09:50:34,951 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2022-03-19 09:50:34,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:50:34,953 INFO L225 Difference]: With dead ends: 113 [2022-03-19 09:50:34,953 INFO L226 Difference]: Without dead ends: 78 [2022-03-19 09:50:34,954 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2022-03-19 09:50:34,955 INFO L912 BasicCegarLoop]: 36 mSDtfsCounter, 12 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 194 mSolverCounterSat, 19 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 194 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-03-19 09:50:34,955 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 263 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 194 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2022-03-19 09:50:34,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-19 09:50:34,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2022-03-19 09:50:34,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 49 states have internal predecessors, (58), 23 states have call successors, (23), 8 states have call predecessors, (23), 7 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 09:50:34,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 102 transitions. [2022-03-19 09:50:34,969 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 102 transitions. Word has length 34 [2022-03-19 09:50:34,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:50:34,969 INFO L478 AbstractCegarLoop]: Abstraction has 78 states and 102 transitions. [2022-03-19 09:50:34,969 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 11 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-19 09:50:34,969 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 102 transitions. [2022-03-19 09:50:34,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 09:50:34,970 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:50:34,970 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:50:34,997 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 09:50:35,183 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 [2022-03-19 09:50:35,183 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:50:35,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:50:35,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1813008070, now seen corresponding path program 1 times [2022-03-19 09:50:35,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:35,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1767632880] [2022-03-19 09:50:35,185 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:50:35,185 INFO L85 PathProgramCache]: Analyzing trace with hash 1813008070, now seen corresponding path program 2 times [2022-03-19 09:50:35,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:50:35,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961051519] [2022-03-19 09:50:35,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:50:35,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:50:35,196 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:50:35,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1968539809] [2022-03-19 09:50:35,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:50:35,197 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:50:35,197 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:50:35,204 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) [2022-03-19 09:50:35,212 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 09:50:35,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:50:35,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:50:35,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 09:50:35,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:50:35,357 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-19 09:50:35,358 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:50:35,358 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:50:35,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [961051519] [2022-03-19 09:50:35,358 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:50:35,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968539809] [2022-03-19 09:50:35,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968539809] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:50:35,358 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:50:35,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 09:50:35,359 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:50:35,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1767632880] [2022-03-19 09:50:35,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1767632880] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:50:35,359 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:50:35,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 09:50:35,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526639045] [2022-03-19 09:50:35,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:50:35,359 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 09:50:35,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:35,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 09:50:35,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-03-19 09:50:35,360 INFO L87 Difference]: Start difference. First operand 78 states and 102 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-19 09:50:35,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:50:35,431 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2022-03-19 09:50:35,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 09:50:35,431 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2022-03-19 09:50:35,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:50:35,432 INFO L225 Difference]: With dead ends: 84 [2022-03-19 09:50:35,432 INFO L226 Difference]: Without dead ends: 82 [2022-03-19 09:50:35,433 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-03-19 09:50:35,433 INFO L912 BasicCegarLoop]: 35 mSDtfsCounter, 20 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:50:35,434 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 203 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:50:35,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-19 09:50:35,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-03-19 09:50:35,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 50 states have (on average 1.22) internal successors, (61), 52 states have internal predecessors, (61), 23 states have call successors, (23), 9 states have call predecessors, (23), 8 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 09:50:35,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 105 transitions. [2022-03-19 09:50:35,448 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 105 transitions. Word has length 41 [2022-03-19 09:50:35,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:50:35,449 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 105 transitions. [2022-03-19 09:50:35,449 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2022-03-19 09:50:35,449 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 105 transitions. [2022-03-19 09:50:35,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 09:50:35,450 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:50:35,450 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:50:35,475 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 09:50:35,674 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 [2022-03-19 09:50:35,675 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:50:35,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:50:35,675 INFO L85 PathProgramCache]: Analyzing trace with hash -683043127, now seen corresponding path program 1 times [2022-03-19 09:50:35,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:35,675 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [304196955] [2022-03-19 09:50:35,676 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:50:35,676 INFO L85 PathProgramCache]: Analyzing trace with hash -683043127, now seen corresponding path program 2 times [2022-03-19 09:50:35,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:50:35,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906728551] [2022-03-19 09:50:35,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:50:35,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:50:35,685 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:50:35,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1327407063] [2022-03-19 09:50:35,685 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:50:35,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:50:35,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:50:35,687 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) [2022-03-19 09:50:35,688 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 09:50:35,732 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:50:35,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:50:35,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 09:50:35,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:50:35,864 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:50:35,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:50:36,043 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-03-19 09:50:36,043 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:50:36,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906728551] [2022-03-19 09:50:36,043 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:50:36,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327407063] [2022-03-19 09:50:36,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327407063] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:50:36,044 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:50:36,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2022-03-19 09:50:36,044 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:50:36,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [304196955] [2022-03-19 09:50:36,044 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [304196955] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:50:36,044 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:50:36,044 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 09:50:36,044 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270454472] [2022-03-19 09:50:36,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:50:36,045 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 09:50:36,045 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:36,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 09:50:36,045 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2022-03-19 09:50:36,046 INFO L87 Difference]: Start difference. First operand 82 states and 105 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-19 09:50:36,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:50:36,143 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2022-03-19 09:50:36,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 09:50:36,144 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 47 [2022-03-19 09:50:36,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:50:36,145 INFO L225 Difference]: With dead ends: 88 [2022-03-19 09:50:36,145 INFO L226 Difference]: Without dead ends: 86 [2022-03-19 09:50:36,146 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-03-19 09:50:36,146 INFO L912 BasicCegarLoop]: 27 mSDtfsCounter, 21 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:50:36,147 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 155 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:50:36,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-03-19 09:50:36,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 86. [2022-03-19 09:50:36,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2022-03-19 09:50:36,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 108 transitions. [2022-03-19 09:50:36,160 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 108 transitions. Word has length 47 [2022-03-19 09:50:36,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:50:36,161 INFO L478 AbstractCegarLoop]: Abstraction has 86 states and 108 transitions. [2022-03-19 09:50:36,161 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-03-19 09:50:36,161 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 108 transitions. [2022-03-19 09:50:36,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 09:50:36,162 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:50:36,162 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:50:36,185 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-03-19 09:50:36,379 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 [2022-03-19 09:50:36,380 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:50:36,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:50:36,380 INFO L85 PathProgramCache]: Analyzing trace with hash -589126939, now seen corresponding path program 1 times [2022-03-19 09:50:36,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:50:36,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [815805866]