/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/cohencu-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 09:32:39,448 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 09:32:39,458 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 09:32:39,502 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 09:32:39,530 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 09:32:39,531 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 09:32:39,531 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 09:32:39,532 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 09:32:39,539 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 09:32:39,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 09:32:39,541 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 09:32:39,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 09:32:39,541 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 09:32:39,541 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 09:32:39,541 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 09:32:39,541 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 09:32:39,542 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 09:32:39,542 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 09:32:39,542 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 09:32:39,542 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 09:32:39,542 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 09:32:39,542 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 09:32:39,543 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 09:32:39,543 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:32:39,543 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 09:32:39,543 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 09:32:39,543 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 09:32:39,543 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 09:32:39,544 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 09:32:39,544 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 09:32:39,544 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 09:32:39,763 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 09:32:39,788 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 09:32:39,789 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 09:32:39,790 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 09:32:39,791 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 09:32:39,792 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound50.c [2022-03-19 09:32:39,840 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a905ee6e1/72cfafd890a943d1803b6b3ebb39c4c1/FLAG22aee3474 [2022-03-19 09:32:40,255 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 09:32:40,255 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_valuebound50.c [2022-03-19 09:32:40,261 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a905ee6e1/72cfafd890a943d1803b6b3ebb39c4c1/FLAG22aee3474 [2022-03-19 09:32:40,663 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a905ee6e1/72cfafd890a943d1803b6b3ebb39c4c1 [2022-03-19 09:32:40,665 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 09:32:40,666 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 09:32:40,669 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 09:32:40,669 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 09:32:40,671 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 09:32:40,672 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:40,673 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@332d6f9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40, skipping insertion in model container [2022-03-19 09:32:40,673 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:40,679 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 09:32:40,690 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 09:32:40,894 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/cohencu-ll_valuebound50.c[588,601] [2022-03-19 09:32:40,930 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:32:40,936 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 09:32:40,947 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/cohencu-ll_valuebound50.c[588,601] [2022-03-19 09:32:40,967 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 09:32:40,982 INFO L208 MainTranslator]: Completed translation [2022-03-19 09:32:40,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40 WrapperNode [2022-03-19 09:32:40,983 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 09:32:40,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 09:32:40,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 09:32:40,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 09:32:40,994 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:40,994 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,009 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,009 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,013 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,016 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,017 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,018 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 09:32:41,019 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 09:32:41,019 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 09:32:41,019 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 09:32:41,024 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (1/1) ... [2022-03-19 09:32:41,030 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 09:32:41,038 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:32:41,052 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 09:32:41,082 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 09:32:41,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 09:32:41,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 09:32:41,102 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 09:32:41,102 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-19 09:32:41,103 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 09:32:41,103 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 09:32:41,103 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 09:32:41,103 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 09:32:41,103 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 09:32:41,104 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 09:32:41,104 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ushort [2022-03-19 09:32:41,104 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-19 09:32:41,104 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 09:32:41,104 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 09:32:41,105 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 09:32:41,106 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 09:32:41,107 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 09:32:41,107 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 09:32:41,107 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 09:32:41,107 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 09:32:41,164 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 09:32:41,165 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 09:32:41,325 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 09:32:41,330 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 09:32:41,330 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-19 09:32:41,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:32:41 BoogieIcfgContainer [2022-03-19 09:32:41,332 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 09:32:41,333 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 09:32:41,333 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 09:32:41,336 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 09:32:41,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 09:32:40" (1/3) ... [2022-03-19 09:32:41,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a6d7fd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:32:41, skipping insertion in model container [2022-03-19 09:32:41,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 09:32:40" (2/3) ... [2022-03-19 09:32:41,337 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a6d7fd2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 09:32:41, skipping insertion in model container [2022-03-19 09:32:41,337 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 09:32:41" (3/3) ... [2022-03-19 09:32:41,338 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_valuebound50.c [2022-03-19 09:32:41,346 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 09:32:41,346 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 09:32:41,412 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 09:32:41,422 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 09:32:41,423 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 09:32:41,436 INFO L276 IsEmpty]: Start isEmpty. Operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-19 09:32:41,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 09:32:41,449 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:41,450 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 09:32:41,450 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:41,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:41,455 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 1 times [2022-03-19 09:32:41,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:41,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1156952167] [2022-03-19 09:32:41,470 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:32:41,470 INFO L85 PathProgramCache]: Analyzing trace with hash 503189915, now seen corresponding path program 2 times [2022-03-19 09:32:41,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:32:41,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158498551] [2022-03-19 09:32:41,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:32:41,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:32:41,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,601 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 09:32:41,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-19 09:32:41,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,617 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 09:32:41,617 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:32:41,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158498551] [2022-03-19 09:32:41,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158498551] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:41,618 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:41,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:32:41,620 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:32:41,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1156952167] [2022-03-19 09:32:41,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1156952167] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:41,621 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:41,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 09:32:41,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454688164] [2022-03-19 09:32:41,622 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:32:41,625 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 09:32:41,625 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:41,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 09:32:41,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 09:32:41,648 INFO L87 Difference]: Start difference. First operand has 36 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 14 states have call successors, (14), 4 states have call predecessors, (14), 4 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) 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 09:32:41,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:32:41,744 INFO L93 Difference]: Finished difference Result 63 states and 101 transitions. [2022-03-19 09:32:41,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 09:32:41,751 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 09:32:41,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:32:41,758 INFO L225 Difference]: With dead ends: 63 [2022-03-19 09:32:41,758 INFO L226 Difference]: Without dead ends: 31 [2022-03-19 09:32:41,761 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 09:32:41,764 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:32:41,764 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 37 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:32:41,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-19 09:32:41,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-19 09:32:41,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 14 states have call successors, (14), 4 states have call predecessors, (14), 3 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-19 09:32:41,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2022-03-19 09:32:41,799 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 17 [2022-03-19 09:32:41,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:32:41,799 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2022-03-19 09:32:41,799 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 09:32:41,800 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2022-03-19 09:32:41,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 09:32:41,800 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:41,800 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 09:32:41,800 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 09:32:41,801 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:41,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:41,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 1 times [2022-03-19 09:32:41,801 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:41,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1038964361] [2022-03-19 09:32:41,802 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:32:41,803 INFO L85 PathProgramCache]: Analyzing trace with hash 1171868123, now seen corresponding path program 2 times [2022-03-19 09:32:41,803 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:32:41,803 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865968856] [2022-03-19 09:32:41,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:32:41,803 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:32:41,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,892 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 09:32:41,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-19 09:32:41,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:32:41,903 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 09:32:41,903 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:32:41,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865968856] [2022-03-19 09:32:41,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865968856] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:41,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:41,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 09:32:41,904 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:32:41,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1038964361] [2022-03-19 09:32:41,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1038964361] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:41,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:41,905 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 09:32:41,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806984882] [2022-03-19 09:32:41,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:32:41,905 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 09:32:41,906 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:41,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 09:32:41,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-03-19 09:32:41,906 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:32:42,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:32:42,112 INFO L93 Difference]: Finished difference Result 37 states and 46 transitions. [2022-03-19 09:32:42,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 09:32:42,113 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2022-03-19 09:32:42,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:32:42,115 INFO L225 Difference]: With dead ends: 37 [2022-03-19 09:32:42,115 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 09:32:42,115 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2022-03-19 09:32:42,116 INFO L912 BasicCegarLoop]: 26 mSDtfsCounter, 22 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 09:32:42,117 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 43 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 09:32:42,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 09:32:42,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-19 09:32:42,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 14 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-19 09:32:42,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2022-03-19 09:32:42,133 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 17 [2022-03-19 09:32:42,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:32:42,134 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2022-03-19 09:32:42,134 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-19 09:32:42,134 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2022-03-19 09:32:42,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 09:32:42,135 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:42,135 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] [2022-03-19 09:32:42,135 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 09:32:42,135 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:42,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:42,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 1 times [2022-03-19 09:32:42,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:42,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1616257210] [2022-03-19 09:32:42,144 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:32:42,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1781524074, now seen corresponding path program 2 times [2022-03-19 09:32:42,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:32:42,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080992874] [2022-03-19 09:32:42,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:32:42,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:32:42,164 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:32:42,165 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1533502593] [2022-03-19 09:32:42,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:32:42,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:32:42,165 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:32:42,175 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 09:32:42,215 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 09:32:42,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:32:42,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:32:42,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 09:32:42,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:32:42,354 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 09:32:42,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:32:42,355 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:32:42,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080992874] [2022-03-19 09:32:42,355 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:32:42,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533502593] [2022-03-19 09:32:42,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533502593] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:42,356 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:42,356 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:42,357 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:32:42,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1616257210] [2022-03-19 09:32:42,358 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1616257210] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:42,358 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:42,358 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:42,358 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803882126] [2022-03-19 09:32:42,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:32:42,359 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:32:42,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:42,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:32:42,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:32:42,361 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 09:32:42,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:32:42,432 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2022-03-19 09:32:42,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:32:42,433 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 22 [2022-03-19 09:32:42,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:32:42,435 INFO L225 Difference]: With dead ends: 54 [2022-03-19 09:32:42,436 INFO L226 Difference]: Without dead ends: 52 [2022-03-19 09:32:42,436 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 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 09:32:42,442 INFO L912 BasicCegarLoop]: 49 mSDtfsCounter, 6 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:32:42,447 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 168 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:32:42,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-19 09:32:42,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 42. [2022-03-19 09:32:42,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 20 states have (on average 1.1) internal successors, (22), 22 states have internal predecessors, (22), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-03-19 09:32:42,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2022-03-19 09:32:42,467 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 22 [2022-03-19 09:32:42,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:32:42,467 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2022-03-19 09:32:42,467 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 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 09:32:42,468 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2022-03-19 09:32:42,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 09:32:42,469 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:42,469 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] [2022-03-19 09:32:42,488 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 09:32:42,675 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:32:42,675 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:42,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:42,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 1 times [2022-03-19 09:32:42,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:42,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [345930723] [2022-03-19 09:32:42,677 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:32:42,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1241120379, now seen corresponding path program 2 times [2022-03-19 09:32:42,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:32:42,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043199927] [2022-03-19 09:32:42,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:32:42,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:32:42,693 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:32:42,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1667942078] [2022-03-19 09:32:42,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:32:42,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:32:42,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:32:42,711 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 09:32:42,712 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 09:32:42,753 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:32:42,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:32:42,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 09:32:42,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:32:42,853 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 09:32:42,853 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:32:42,854 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:32:42,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043199927] [2022-03-19 09:32:42,854 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:32:42,854 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1667942078] [2022-03-19 09:32:42,854 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1667942078] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:42,854 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:42,855 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:42,855 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:32:42,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [345930723] [2022-03-19 09:32:42,855 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [345930723] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:42,856 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:42,856 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:42,856 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503075572] [2022-03-19 09:32:42,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:32:42,857 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:32:42,857 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:42,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:32:42,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:32:42,858 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:32:42,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:32:42,915 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2022-03-19 09:32:42,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:32:42,923 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2022-03-19 09:32:42,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:32:42,924 INFO L225 Difference]: With dead ends: 58 [2022-03-19 09:32:42,925 INFO L226 Difference]: Without dead ends: 56 [2022-03-19 09:32:42,925 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 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 09:32:42,926 INFO L912 BasicCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:32:42,926 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 165 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:32:42,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-19 09:32:42,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 52. [2022-03-19 09:32:42,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 24 states have (on average 1.125) internal successors, (27), 26 states have internal predecessors, (27), 21 states have call successors, (21), 7 states have call predecessors, (21), 6 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2022-03-19 09:32:42,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 67 transitions. [2022-03-19 09:32:42,949 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 67 transitions. Word has length 27 [2022-03-19 09:32:42,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:32:42,950 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 67 transitions. [2022-03-19 09:32:42,950 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-03-19 09:32:42,951 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 67 transitions. [2022-03-19 09:32:42,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 09:32:42,952 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:42,952 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:32:42,978 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 09:32:43,175 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,SelfDestructingSolverStorable3 [2022-03-19 09:32:43,176 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:43,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:43,176 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 1 times [2022-03-19 09:32:43,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:43,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1189497028] [2022-03-19 09:32:43,177 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 09:32:43,177 INFO L85 PathProgramCache]: Analyzing trace with hash 1598126198, now seen corresponding path program 2 times [2022-03-19 09:32:43,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:32:43,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1161271728] [2022-03-19 09:32:43,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:32:43,178 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:32:43,188 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:32:43,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1919494787] [2022-03-19 09:32:43,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 09:32:43,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:32:43,189 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:32:43,193 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 09:32:43,227 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 09:32:43,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 09:32:43,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 09:32:43,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 09:32:43,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:32:43,349 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 09:32:43,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-19 09:32:43,350 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:32:43,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1161271728] [2022-03-19 09:32:43,350 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:32:43,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1919494787] [2022-03-19 09:32:43,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1919494787] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:43,350 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:43,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:43,351 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:32:43,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1189497028] [2022-03-19 09:32:43,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1189497028] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:32:43,351 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:32:43,351 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 09:32:43,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967652676] [2022-03-19 09:32:43,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:32:43,351 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 09:32:43,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:43,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 09:32:43,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-19 09:32:43,352 INFO L87 Difference]: Start difference. First operand 52 states and 67 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-19 09:32:43,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:32:43,423 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2022-03-19 09:32:43,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 09:32:43,424 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-03-19 09:32:43,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:32:43,425 INFO L225 Difference]: With dead ends: 66 [2022-03-19 09:32:43,425 INFO L226 Difference]: Without dead ends: 54 [2022-03-19 09:32:43,426 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 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 09:32:43,427 INFO L912 BasicCegarLoop]: 45 mSDtfsCounter, 6 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 09:32:43,427 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 157 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 09:32:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-19 09:32:43,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-19 09:32:43,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 28 states have internal predecessors, (29), 19 states have call successors, (19), 8 states have call predecessors, (19), 7 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-19 09:32:43,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2022-03-19 09:32:43,444 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 32 [2022-03-19 09:32:43,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:32:43,444 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2022-03-19 09:32:43,445 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-19 09:32:43,445 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2022-03-19 09:32:43,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-19 09:32:43,446 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:32:43,447 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:32:43,473 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 09:32:43,663 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:32:43,664 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:32:43,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:32:43,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1002403483, now seen corresponding path program 1 times [2022-03-19 09:32:43,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:32:43,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1394602595] [2022-03-19 09:33:29,089 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 09:33:29,091 INFO L85 PathProgramCache]: Analyzing trace with hash -1018400594, now seen corresponding path program 1 times [2022-03-19 09:33:29,091 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:33:29,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603825146] [2022-03-19 09:33:29,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:33:29,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:33:29,112 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:33:29,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1877829428] [2022-03-19 09:33:29,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:33:29,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:33:29,113 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:33:29,114 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 09:33:29,119 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 09:33:29,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:33:29,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-19 09:33:29,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:33:29,457 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:33:29,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:33:29,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 09:33:29,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:33:29,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603825146] [2022-03-19 09:33:29,605 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:33:29,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877829428] [2022-03-19 09:33:29,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877829428] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:33:29,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:33:29,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2022-03-19 09:34:23,679 WARN L232 SmtUtils]: Spent 6.06s on a formula simplification. DAG size of input: 28 DAG size of output: 23 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-03-19 09:34:44,169 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:34:44,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1394602595] [2022-03-19 09:34:44,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1394602595] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:34:44,169 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:34:44,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 09:34:44,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719840525] [2022-03-19 09:34:44,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:34:44,170 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 09:34:44,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:34:44,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 09:34:44,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=973, Unknown=28, NotChecked=0, Total=1190 [2022-03-19 09:34:44,175 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-03-19 09:34:50,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:34:50,988 INFO L93 Difference]: Finished difference Result 80 states and 89 transitions. [2022-03-19 09:34:50,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 09:34:50,989 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 49 [2022-03-19 09:34:50,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:34:50,990 INFO L225 Difference]: With dead ends: 80 [2022-03-19 09:34:50,990 INFO L226 Difference]: Without dead ends: 78 [2022-03-19 09:34:50,991 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 42 SyntacticMatches, 7 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 80.7s TimeCoverageRelationStatistics Valid=247, Invalid=1363, Unknown=30, NotChecked=0, Total=1640 [2022-03-19 09:34:50,992 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 25 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 405 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 120 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 09:34:50,992 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 405 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 93 Invalid, 0 Unknown, 120 Unchecked, 0.3s Time] [2022-03-19 09:34:50,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-19 09:34:51,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2022-03-19 09:34:51,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 19 states have call successors, (19), 14 states have call predecessors, (19), 12 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-19 09:34:51,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 85 transitions. [2022-03-19 09:34:51,019 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 85 transitions. Word has length 49 [2022-03-19 09:34:51,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:34:51,020 INFO L478 AbstractCegarLoop]: Abstraction has 76 states and 85 transitions. [2022-03-19 09:34:51,020 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 17 states have internal predecessors, (31), 8 states have call successors, (10), 7 states have call predecessors, (10), 7 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2022-03-19 09:34:51,020 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 85 transitions. [2022-03-19 09:34:51,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-19 09:34:51,021 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:34:51,021 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:34:51,038 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-03-19 09:34:51,223 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:34:51,224 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:34:51,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:34:51,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1130038122, now seen corresponding path program 2 times [2022-03-19 09:34:51,224 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:34:51,224 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [274611141] [2022-03-19 09:41:36,279 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 09:41:36,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1063970467, now seen corresponding path program 1 times [2022-03-19 09:41:36,280 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 09:41:36,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102912641] [2022-03-19 09:41:36,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:36,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 09:41:36,288 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-19 09:41:36,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1110090227] [2022-03-19 09:41:36,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 09:41:36,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:41:36,289 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 09:41:36,295 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 09:41:36,296 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 09:41:36,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 09:41:36,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-19 09:41:36,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 09:41:36,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 09:41:36,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 09:41:38,722 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-19 09:41:38,722 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 09:41:38,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102912641] [2022-03-19 09:41:38,722 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-19 09:41:38,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110090227] [2022-03-19 09:41:38,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110090227] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 09:41:38,722 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-19 09:41:38,723 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 13 [2022-03-19 09:42:57,696 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 09:42:57,696 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [274611141] [2022-03-19 09:42:57,696 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [274611141] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 09:42:57,696 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 09:42:57,696 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 09:42:57,696 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044621972] [2022-03-19 09:42:57,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 09:42:57,697 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 09:42:57,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 09:42:57,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 09:42:57,698 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1058, Unknown=28, NotChecked=0, Total=1260 [2022-03-19 09:42:57,698 INFO L87 Difference]: Start difference. First operand 76 states and 85 transitions. Second operand has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2022-03-19 09:43:06,389 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 09:43:09,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 09:43:09,569 INFO L93 Difference]: Finished difference Result 84 states and 91 transitions. [2022-03-19 09:43:09,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-19 09:43:09,569 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) Word has length 54 [2022-03-19 09:43:09,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 09:43:09,570 INFO L225 Difference]: With dead ends: 84 [2022-03-19 09:43:09,570 INFO L226 Difference]: Without dead ends: 82 [2022-03-19 09:43:09,571 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 52 SyntacticMatches, 7 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 689 ImplicationChecksByTransitivity, 90.0s TimeCoverageRelationStatistics Valid=279, Invalid=1760, Unknown=31, NotChecked=0, Total=2070 [2022-03-19 09:43:09,571 INFO L912 BasicCegarLoop]: 34 mSDtfsCounter, 40 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 46 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 441 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 140 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2022-03-19 09:43:09,572 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 441 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 152 Invalid, 1 Unknown, 140 Unchecked, 2.7s Time] [2022-03-19 09:43:09,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-03-19 09:43:09,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2022-03-19 09:43:09,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 49 states have internal predecessors, (52), 19 states have call successors, (19), 15 states have call predecessors, (19), 14 states have return successors, (17), 17 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-19 09:43:09,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2022-03-19 09:43:09,590 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 54 [2022-03-19 09:43:09,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 09:43:09,590 INFO L478 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2022-03-19 09:43:09,590 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 18 states have internal predecessors, (34), 8 states have call successors, (11), 7 states have call predecessors, (11), 7 states have return successors, (9), 7 states have call predecessors, (9), 8 states have call successors, (9) [2022-03-19 09:43:09,590 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2022-03-19 09:43:09,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 09:43:09,591 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 09:43:09,591 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 09:43:09,614 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 09:43:09,814 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 09:43:09,815 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 09:43:09,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 09:43:09,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1546120389, now seen corresponding path program 3 times [2022-03-19 09:43:09,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 09:43:09,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1427307363]