/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/ps5-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 21:25:31,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 21:25:31,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 21:25:31,356 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 21:25:31,401 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 21:25:31,410 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 21:25:31,410 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 21:25:31,411 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 21:25:31,411 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 21:25:31,411 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 21:25:31,411 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 21:25:31,412 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 21:25:31,412 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 21:25:31,412 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 21:25:31,412 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 21:25:31,412 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 21:25:31,413 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:25:31,413 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 21:25:31,413 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 21:25:31,630 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 21:25:31,646 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 21:25:31,648 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 21:25:31,649 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 21:25:31,650 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 21:25:31,651 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps5-ll.c [2022-04-06 21:25:31,711 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f7188db/22e2c6d0f97645979e4704e93d38c376/FLAGc9ab1f218 [2022-04-06 21:25:32,073 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 21:25:32,074 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps5-ll.c [2022-04-06 21:25:32,079 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f7188db/22e2c6d0f97645979e4704e93d38c376/FLAGc9ab1f218 [2022-04-06 21:25:32,094 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92f7188db/22e2c6d0f97645979e4704e93d38c376 [2022-04-06 21:25:32,096 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 21:25:32,097 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 21:25:32,100 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 21:25:32,100 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 21:25:32,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 21:25:32,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,104 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@614700ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32, skipping insertion in model container [2022-04-06 21:25:32,105 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,109 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 21:25:32,121 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 21:25:32,236 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/ps5-ll.c[458,471] [2022-04-06 21:25:32,247 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:25:32,252 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 21:25:32,259 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/ps5-ll.c[458,471] [2022-04-06 21:25:32,265 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 21:25:32,274 INFO L208 MainTranslator]: Completed translation [2022-04-06 21:25:32,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32 WrapperNode [2022-04-06 21:25:32,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 21:25:32,275 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 21:25:32,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 21:25:32,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 21:25:32,282 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,288 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,288 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,299 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,302 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,313 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 21:25:32,314 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 21:25:32,315 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 21:25:32,315 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 21:25:32,315 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (1/1) ... [2022-04-06 21:25:32,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 21:25:32,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:32,337 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-06 21:25:32,344 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-06 21:25:32,366 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 21:25:32,366 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 21:25:32,366 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 21:25:32,366 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 21:25:32,367 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 21:25:32,367 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 21:25:32,367 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 21:25:32,368 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 21:25:32,410 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 21:25:32,411 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 21:25:32,553 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 21:25:32,558 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 21:25:32,558 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 21:25:32,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:25:32 BoogieIcfgContainer [2022-04-06 21:25:32,559 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 21:25:32,560 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 21:25:32,560 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 21:25:32,581 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 21:25:32,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 09:25:32" (1/3) ... [2022-04-06 21:25:32,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f916634 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:25:32, skipping insertion in model container [2022-04-06 21:25:32,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 09:25:32" (2/3) ... [2022-04-06 21:25:32,582 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f916634 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 09:25:32, skipping insertion in model container [2022-04-06 21:25:32,582 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 09:25:32" (3/3) ... [2022-04-06 21:25:32,583 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll.c [2022-04-06 21:25:32,586 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 21:25:32,586 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 21:25:32,637 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 21:25:32,642 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-06 21:25:32,642 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 21:25:32,660 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 21:25:32,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 21:25:32,666 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:32,666 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:32,666 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:32,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:32,679 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 1 times [2022-04-06 21:25:32,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:32,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [391946609] [2022-04-06 21:25:32,696 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:25:32,696 INFO L85 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 2 times [2022-04-06 21:25:32,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:32,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859495313] [2022-04-06 21:25:32,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:32,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:32,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:32,843 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 21:25:32,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:32,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 21:25:32,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 21:25:32,868 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:32,868 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:32,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859495313] [2022-04-06 21:25:32,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859495313] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:32,869 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:32,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:25:32,871 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:32,873 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [391946609] [2022-04-06 21:25:32,873 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [391946609] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:32,873 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:32,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 21:25:32,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57071992] [2022-04-06 21:25:32,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:32,877 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 21:25:32,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:32,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 21:25:32,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 21:25:32,904 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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) [2022-04-06 21:25:32,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:32,973 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2022-04-06 21:25:32,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 21:25:32,975 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 [2022-04-06 21:25:32,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:32,981 INFO L225 Difference]: With dead ends: 47 [2022-04-06 21:25:32,982 INFO L226 Difference]: Without dead ends: 23 [2022-04-06 21:25:32,985 INFO L912 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 [2022-04-06 21:25:32,990 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:32,993 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:33,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-04-06 21:25:33,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-04-06 21:25:33,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 21:25:33,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-06 21:25:33,035 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2022-04-06 21:25:33,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:33,036 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-06 21:25:33,037 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) [2022-04-06 21:25:33,037 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-06 21:25:33,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 21:25:33,038 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:33,038 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:33,038 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 21:25:33,038 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:33,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:33,039 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 1 times [2022-04-06 21:25:33,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:33,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1680177397] [2022-04-06 21:25:33,046 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 21:25:33,046 INFO L85 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 2 times [2022-04-06 21:25:33,046 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:33,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676025959] [2022-04-06 21:25:33,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:33,047 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:33,058 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:33,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [958751244] [2022-04-06 21:25:33,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:33,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:33,060 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:33,062 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:33,063 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 21:25:33,102 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-04-06 21:25:33,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:33,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 21:25:33,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:33,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:33,204 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 21:25:33,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:33,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676025959] [2022-04-06 21:25:33,205 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:33,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958751244] [2022-04-06 21:25:33,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [958751244] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:33,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:33,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:33,206 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:33,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1680177397] [2022-04-06 21:25:33,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1680177397] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:33,206 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:33,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:33,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364505089] [2022-04-06 21:25:33,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:33,208 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:25:33,208 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:33,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:25:33,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 21:25:33,210 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-04-06 21:25:33,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:33,287 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-04-06 21:25:33,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:25:33,287 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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 17 [2022-04-06 21:25:33,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:33,288 INFO L225 Difference]: With dead ends: 34 [2022-04-06 21:25:33,288 INFO L226 Difference]: Without dead ends: 30 [2022-04-06 21:25:33,289 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-04-06 21:25:33,289 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 6 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:33,290 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 77 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:33,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-04-06 21:25:33,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-04-06 21:25:33,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 21:25:33,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-04-06 21:25:33,296 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2022-04-06 21:25:33,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:33,297 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-04-06 21:25:33,297 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 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) [2022-04-06 21:25:33,297 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-04-06 21:25:33,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-04-06 21:25:33,297 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:33,298 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:33,315 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-04-06 21:25:33,498 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 [2022-04-06 21:25:33,499 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:33,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:33,499 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 1 times [2022-04-06 21:25:33,499 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:33,499 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [950276001] [2022-04-06 21:25:33,523 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:33,524 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:33,524 INFO L85 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 2 times [2022-04-06 21:25:33,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:33,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932442278] [2022-04-06 21:25:33,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:33,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:33,552 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:33,552 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1170314518] [2022-04-06 21:25:33,552 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:33,552 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:33,552 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:33,553 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:33,554 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 21:25:33,879 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:33,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:33,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 21:25:33,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:34,014 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 21:25:34,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:34,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-06 21:25:34,266 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:34,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932442278] [2022-04-06 21:25:34,266 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:34,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170314518] [2022-04-06 21:25:34,267 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170314518] provided 1 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:34,267 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:34,267 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7 [2022-04-06 21:25:34,267 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:34,267 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [950276001] [2022-04-06 21:25:34,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [950276001] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:34,268 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:34,268 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 21:25:34,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121401942] [2022-04-06 21:25:34,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:34,268 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 21:25:34,268 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:34,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 21:25:34,269 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-04-06 21:25:34,269 INFO L87 Difference]: Start difference. First operand 30 states and 32 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) [2022-04-06 21:25:34,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:34,382 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2022-04-06 21:25:34,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 21:25:34,383 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 24 [2022-04-06 21:25:34,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:34,384 INFO L225 Difference]: With dead ends: 36 [2022-04-06 21:25:34,384 INFO L226 Difference]: Without dead ends: 32 [2022-04-06 21:25:34,385 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-04-06 21:25:34,386 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:34,386 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 67 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:34,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-04-06 21:25:34,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-04-06 21:25:34,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 7 states have call successors, (7), 6 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 21:25:34,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2022-04-06 21:25:34,393 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 24 [2022-04-06 21:25:34,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:34,393 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2022-04-06 21:25:34,393 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) [2022-04-06 21:25:34,394 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2022-04-06 21:25:34,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-06 21:25:34,394 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:34,394 INFO L499 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:34,404 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:34,595 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 [2022-04-06 21:25:34,595 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:34,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:34,596 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 1 times [2022-04-06 21:25:34,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:34,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [22534450] [2022-04-06 21:25:34,599 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:34,599 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:34,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1106328449, now seen corresponding path program 2 times [2022-04-06 21:25:34,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:34,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123224346] [2022-04-06 21:25:34,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:34,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:34,608 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:34,608 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2122042492] [2022-04-06 21:25:34,609 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 21:25:34,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:34,609 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:34,610 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:34,611 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 21:25:34,642 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 21:25:34,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:34,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 21:25:34,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:34,803 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 21:25:34,804 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:34,982 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:34,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123224346] [2022-04-06 21:25:34,983 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:34,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2122042492] [2022-04-06 21:25:34,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2122042492] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:34,983 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:34,983 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2022-04-06 21:25:34,983 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:34,983 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [22534450] [2022-04-06 21:25:34,984 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [22534450] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:34,984 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:34,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 21:25:34,984 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5391255] [2022-04-06 21:25:34,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:34,984 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 21:25:34,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:34,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 21:25:34,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2022-04-06 21:25:34,985 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 21:25:35,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:35,058 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2022-04-06 21:25:35,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 21:25:35,058 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 35 [2022-04-06 21:25:35,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:35,059 INFO L225 Difference]: With dead ends: 41 [2022-04-06 21:25:35,059 INFO L226 Difference]: Without dead ends: 35 [2022-04-06 21:25:35,060 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2022-04-06 21:25:35,061 INFO L913 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:35,061 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 125 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 21:25:35,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-04-06 21:25:35,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-04-06 21:25:35,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-04-06 21:25:35,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-04-06 21:25:35,068 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 35 [2022-04-06 21:25:35,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:35,068 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-04-06 21:25:35,068 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-04-06 21:25:35,068 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-04-06 21:25:35,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-04-06 21:25:35,069 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:35,069 INFO L499 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:35,086 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-04-06 21:25:35,286 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 [2022-04-06 21:25:35,286 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:35,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:35,287 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 3 times [2022-04-06 21:25:35,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:35,287 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1840084824] [2022-04-06 21:25:35,289 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:35,289 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:35,290 INFO L85 PathProgramCache]: Analyzing trace with hash 1564024736, now seen corresponding path program 4 times [2022-04-06 21:25:35,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:35,290 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202249953] [2022-04-06 21:25:35,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:35,290 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:35,297 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:35,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1908426116] [2022-04-06 21:25:35,298 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 21:25:35,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:35,298 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:35,304 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:35,305 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 21:25:35,337 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 21:25:35,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 21:25:35,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 16 conjunts are in the unsatisfiable core [2022-04-06 21:25:35,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 21:25:35,492 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 8 proven. 9 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-04-06 21:25:35,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 21:25:35,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 21:25:35,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202249953] [2022-04-06 21:25:35,605 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-04-06 21:25:35,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1908426116] [2022-04-06 21:25:35,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1908426116] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 21:25:35,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2022-04-06 21:25:35,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2022-04-06 21:25:35,606 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 21:25:35,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1840084824] [2022-04-06 21:25:35,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1840084824] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 21:25:35,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 21:25:35,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 21:25:35,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320789406] [2022-04-06 21:25:35,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 21:25:35,607 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 21:25:35,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:35,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 21:25:35,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-04-06 21:25:35,607 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 21:25:35,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 21:25:35,694 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-04-06 21:25:35,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 21:25:35,694 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 42 [2022-04-06 21:25:35,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 21:25:35,695 INFO L225 Difference]: With dead ends: 44 [2022-04-06 21:25:35,695 INFO L226 Difference]: Without dead ends: 38 [2022-04-06 21:25:35,696 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-04-06 21:25:35,696 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 2 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 21:25:35,696 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 154 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 21:25:35,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-04-06 21:25:35,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-04-06 21:25:35,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 9 states have call successors, (9), 6 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-04-06 21:25:35,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2022-04-06 21:25:35,703 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 42 [2022-04-06 21:25:35,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 21:25:35,703 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2022-04-06 21:25:35,704 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 7 states have internal predecessors, (19), 5 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-04-06 21:25:35,704 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2022-04-06 21:25:35,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-04-06 21:25:35,705 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 21:25:35,705 INFO L499 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 21:25:35,725 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 21:25:35,905 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 [2022-04-06 21:25:35,905 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 21:25:35,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 21:25:35,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 5 times [2022-04-06 21:25:35,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 21:25:35,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1160654024] [2022-04-06 21:25:35,908 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Cannot deal with arrays. [2022-04-06 21:25:35,908 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 21:25:35,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1951214241, now seen corresponding path program 6 times [2022-04-06 21:25:35,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 21:25:35,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618474838] [2022-04-06 21:25:35,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 21:25:35,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 21:25:35,916 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-04-06 21:25:35,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1286191153] [2022-04-06 21:25:35,916 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 21:25:35,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 21:25:35,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 21:25:35,917 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 21:25:35,918 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process