/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 13:36:06,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 13:36:06,070 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 13:36:06,112 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 13:36:06,138 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 13:36:06,139 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 13:36:06,145 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 13:36:06,146 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 13:36:06,152 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 13:36:06,152 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 13:36:06,153 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 13:36:06,153 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 13:36:06,154 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 13:36:06,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:36:06,155 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 13:36:06,155 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 13:36:06,155 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 13:36:06,155 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 13:36:06,162 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 13:36:06,162 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 13:36:06,162 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 13:36:06,336 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 13:36:06,361 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 13:36:06,362 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 13:36:06,363 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 13:36:06,364 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 13:36:06,365 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2022-03-20 13:36:06,414 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5113de43/1e9f288a92b3455280c8162747598c55/FLAG8b316bb3d [2022-03-20 13:36:06,773 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 13:36:06,773 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/dijkstra-u.c [2022-03-20 13:36:06,785 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5113de43/1e9f288a92b3455280c8162747598c55/FLAG8b316bb3d [2022-03-20 13:36:06,793 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b5113de43/1e9f288a92b3455280c8162747598c55 [2022-03-20 13:36:06,795 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 13:36:06,797 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 13:36:06,798 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 13:36:06,798 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 13:36:06,800 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 13:36:06,800 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:36:06" (1/1) ... [2022-03-20 13:36:06,801 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b2d1299 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:06, skipping insertion in model container [2022-03-20 13:36:06,801 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:36:06" (1/1) ... [2022-03-20 13:36:06,806 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 13:36:06,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 13:36:06,974 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/dijkstra-u.c[525,538] [2022-03-20 13:36:06,992 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:36:06,997 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 13:36:07,004 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/dijkstra-u.c[525,538] [2022-03-20 13:36:07,019 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:36:07,027 INFO L208 MainTranslator]: Completed translation [2022-03-20 13:36:07,028 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07 WrapperNode [2022-03-20 13:36:07,028 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 13:36:07,029 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 13:36:07,029 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 13:36:07,029 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 13:36:07,037 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,037 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,049 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,049 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,052 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,055 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,056 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,057 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 13:36:07,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 13:36:07,058 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 13:36:07,058 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 13:36:07,058 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (1/1) ... [2022-03-20 13:36:07,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:36:07,071 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:07,081 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 13:36:07,095 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 13:36:07,107 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 13:36:07,108 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 13:36:07,147 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 13:36:07,148 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 13:36:07,308 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 13:36:07,313 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 13:36:07,314 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 13:36:07,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:36:07 BoogieIcfgContainer [2022-03-20 13:36:07,320 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 13:36:07,321 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 13:36:07,321 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 13:36:07,323 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 13:36:07,323 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 01:36:06" (1/3) ... [2022-03-20 13:36:07,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9b5484b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:36:07, skipping insertion in model container [2022-03-20 13:36:07,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:36:07" (2/3) ... [2022-03-20 13:36:07,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@9b5484b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:36:07, skipping insertion in model container [2022-03-20 13:36:07,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:36:07" (3/3) ... [2022-03-20 13:36:07,325 INFO L111 eAbstractionObserver]: Analyzing ICFG dijkstra-u.c [2022-03-20 13:36:07,330 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 13:36:07,330 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 13:36:07,358 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 13:36:07,363 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 13:36:07,363 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 13:36:07,373 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2022-03-20 13:36:07,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-20 13:36:07,378 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:07,378 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:07,379 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:07,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:07,384 INFO L85 PathProgramCache]: Analyzing trace with hash 818818098, now seen corresponding path program 1 times [2022-03-20 13:36:07,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:07,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [457955452] [2022-03-20 13:36:07,397 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:36:07,397 INFO L85 PathProgramCache]: Analyzing trace with hash 818818098, now seen corresponding path program 2 times [2022-03-20 13:36:07,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:07,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420632068] [2022-03-20 13:36:07,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:07,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:07,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:07,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:36:07,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:07,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 13:36:07,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:07,583 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:07,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:07,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420632068] [2022-03-20 13:36:07,584 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420632068] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:07,584 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:07,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:36:07,586 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:07,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [457955452] [2022-03-20 13:36:07,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [457955452] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:07,587 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:07,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 13:36:07,587 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467321872] [2022-03-20 13:36:07,587 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:07,590 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 13:36:07,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:07,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 13:36:07,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 13:36:07,616 INFO L87 Difference]: Start difference. First operand has 37 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 13:36:09,693 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 13:36:09,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:09,966 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2022-03-20 13:36:09,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 13:36:09,968 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2022-03-20 13:36:09,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:09,973 INFO L225 Difference]: With dead ends: 65 [2022-03-20 13:36:09,973 INFO L226 Difference]: Without dead ends: 32 [2022-03-20 13:36:09,975 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 [2022-03-20 13:36:09,978 INFO L913 BasicCegarLoop]: 38 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:09,979 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 41 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 10 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-03-20 13:36:09,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-20 13:36:10,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-20 13:36:10,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-03-20 13:36:10,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2022-03-20 13:36:10,012 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2022-03-20 13:36:10,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:10,013 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2022-03-20 13:36:10,013 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 13:36:10,013 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2022-03-20 13:36:10,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-20 13:36:10,014 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:10,014 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:10,014 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 13:36:10,014 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:10,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:10,015 INFO L85 PathProgramCache]: Analyzing trace with hash 1723375776, now seen corresponding path program 1 times [2022-03-20 13:36:10,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:10,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [26778888] [2022-03-20 13:36:10,016 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:36:10,016 INFO L85 PathProgramCache]: Analyzing trace with hash 1723375776, now seen corresponding path program 2 times [2022-03-20 13:36:10,016 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:10,016 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559683574] [2022-03-20 13:36:10,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:10,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:10,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:10,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:36:10,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:10,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 13:36:10,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:10,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:10,206 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:10,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559683574] [2022-03-20 13:36:10,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559683574] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:10,207 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:10,207 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 13:36:10,207 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:10,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [26778888] [2022-03-20 13:36:10,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [26778888] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:10,208 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:10,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 13:36:10,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1961060296] [2022-03-20 13:36:10,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:10,209 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 13:36:10,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:10,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 13:36:10,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-03-20 13:36:10,209 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-03-20 13:36:14,730 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-03-20 13:36:14,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:14,929 INFO L93 Difference]: Finished difference Result 67 states and 96 transitions. [2022-03-20 13:36:14,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-20 13:36:14,930 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 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 19 [2022-03-20 13:36:14,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:14,931 INFO L225 Difference]: With dead ends: 67 [2022-03-20 13:36:14,931 INFO L226 Difference]: Without dead ends: 47 [2022-03-20 13:36:14,932 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2022-03-20 13:36:14,932 INFO L913 BasicCegarLoop]: 29 mSDtfsCounter, 35 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 54 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 233 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:14,933 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 233 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 178 Invalid, 1 Unknown, 0 Unchecked, 4.6s Time] [2022-03-20 13:36:14,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-20 13:36:14,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-20 13:36:14,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 19 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2022-03-20 13:36:14,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 63 transitions. [2022-03-20 13:36:14,951 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 63 transitions. Word has length 19 [2022-03-20 13:36:14,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:14,952 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 63 transitions. [2022-03-20 13:36:14,952 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 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) [2022-03-20 13:36:14,952 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 63 transitions. [2022-03-20 13:36:14,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-20 13:36:14,954 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:14,954 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:14,954 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 13:36:14,955 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:14,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:14,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1182987237, now seen corresponding path program 1 times [2022-03-20 13:36:14,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:14,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [48082506] [2022-03-20 13:36:14,974 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:36:14,974 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 13:36:14,974 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:36:14,974 INFO L85 PathProgramCache]: Analyzing trace with hash -1182987237, now seen corresponding path program 2 times [2022-03-20 13:36:14,974 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:14,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20518838] [2022-03-20 13:36:14,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:14,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:15,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:15,152 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:36:15,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:15,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 13:36:15,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:15,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:15,171 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:15,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20518838] [2022-03-20 13:36:15,172 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20518838] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:36:15,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1942951945] [2022-03-20 13:36:15,172 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:36:15,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:36:15,172 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:15,174 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:36:15,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 13:36:15,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2022-03-20 13:36:15,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:36:15,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-20 13:36:15,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:36:15,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-20 13:36:15,486 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 13:36:15,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1942951945] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:15,486 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 13:36:15,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 10 [2022-03-20 13:36:15,487 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:15,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [48082506] [2022-03-20 13:36:15,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [48082506] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:15,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:15,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-20 13:36:15,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119155316] [2022-03-20 13:36:15,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:15,488 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-20 13:36:15,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:15,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-20 13:36:15,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-03-20 13:36:15,489 INFO L87 Difference]: Start difference. First operand 47 states and 63 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 13:36:16,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:16,358 INFO L93 Difference]: Finished difference Result 76 states and 110 transitions. [2022-03-20 13:36:16,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-20 13:36:16,359 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 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 21 [2022-03-20 13:36:16,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:16,360 INFO L225 Difference]: With dead ends: 76 [2022-03-20 13:36:16,360 INFO L226 Difference]: Without dead ends: 70 [2022-03-20 13:36:16,360 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2022-03-20 13:36:16,363 INFO L913 BasicCegarLoop]: 39 mSDtfsCounter, 12 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:16,363 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 173 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 13:36:16,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-03-20 13:36:16,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 62. [2022-03-20 13:36:16,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 33 states have internal predecessors, (37), 26 states have call successors, (26), 6 states have call predecessors, (26), 5 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23) [2022-03-20 13:36:16,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 86 transitions. [2022-03-20 13:36:16,378 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 86 transitions. Word has length 21 [2022-03-20 13:36:16,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:16,378 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 86 transitions. [2022-03-20 13:36:16,378 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-03-20 13:36:16,378 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 86 transitions. [2022-03-20 13:36:16,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 13:36:16,379 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:16,379 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:16,413 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 13:36:16,579 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 [2022-03-20 13:36:16,580 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:16,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:16,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1777258624, now seen corresponding path program 1 times [2022-03-20 13:36:16,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:16,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1424217291] [2022-03-20 13:36:16,581 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:36:16,581 INFO L85 PathProgramCache]: Analyzing trace with hash -1777258624, now seen corresponding path program 2 times [2022-03-20 13:36:16,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:16,581 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102401595] [2022-03-20 13:36:16,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:16,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:16,589 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:36:16,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1107705067] [2022-03-20 13:36:16,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:36:16,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:36:16,589 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:16,603 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:36:16,610 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 13:36:16,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:36:16,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:36:16,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-20 13:36:16,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:36:16,765 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:36:16,765 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 13:36:16,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:16,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102401595] [2022-03-20 13:36:16,766 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:36:16,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107705067] [2022-03-20 13:36:16,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107705067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:16,766 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:16,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:36:16,766 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:16,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1424217291] [2022-03-20 13:36:16,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1424217291] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:16,772 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:16,773 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:36:16,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679246609] [2022-03-20 13:36:16,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:16,774 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 13:36:16,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:16,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 13:36:16,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 13:36:16,775 INFO L87 Difference]: Start difference. First operand 62 states and 86 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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) [2022-03-20 13:36:17,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:17,632 INFO L93 Difference]: Finished difference Result 73 states and 95 transitions. [2022-03-20 13:36:17,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 13:36:17,633 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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 29 [2022-03-20 13:36:17,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:17,635 INFO L225 Difference]: With dead ends: 73 [2022-03-20 13:36:17,635 INFO L226 Difference]: Without dead ends: 50 [2022-03-20 13:36:17,635 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 13:36:17,636 INFO L913 BasicCegarLoop]: 44 mSDtfsCounter, 6 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:17,636 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 152 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-20 13:36:17,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-20 13:36:17,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-20 13:36:17,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 25 states have (on average 1.24) internal successors, (31), 28 states have internal predecessors, (31), 20 states have call successors, (20), 5 states have call predecessors, (20), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2022-03-20 13:36:17,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 68 transitions. [2022-03-20 13:36:17,643 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 68 transitions. Word has length 29 [2022-03-20 13:36:17,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:17,643 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 68 transitions. [2022-03-20 13:36:17,643 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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) [2022-03-20 13:36:17,643 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 68 transitions. [2022-03-20 13:36:17,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-20 13:36:17,644 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:17,644 INFO L499 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:17,652 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 13:36:17,850 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 [2022-03-20 13:36:17,850 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:17,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:17,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1684913467, now seen corresponding path program 1 times [2022-03-20 13:36:17,850 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:17,850 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [512038168] [2022-03-20 13:36:17,852 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:36:17,852 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 13:36:17,852 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:36:17,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1684913467, now seen corresponding path program 2 times [2022-03-20 13:36:17,852 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:17,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997803909] [2022-03-20 13:36:17,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:17,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:17,867 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:36:17,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1125400576] [2022-03-20 13:36:17,867 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:36:17,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:36:17,868 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:17,872 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:36:17,874 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 13:36:17,940 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 13:36:17,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 13:36:17,941 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 13:36:17,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:36:18,016 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 13:36:18,016 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 13:36:18,017 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:18,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997803909] [2022-03-20 13:36:18,017 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 13:36:18,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125400576] [2022-03-20 13:36:18,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125400576] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:18,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:18,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:36:18,017 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:18,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [512038168] [2022-03-20 13:36:18,017 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [512038168] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:18,017 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:18,017 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 13:36:18,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316356943] [2022-03-20 13:36:18,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:18,018 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 13:36:18,018 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:18,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 13:36:18,018 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 13:36:18,018 INFO L87 Difference]: Start difference. First operand 50 states and 68 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2022-03-20 13:36:18,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:18,528 INFO L93 Difference]: Finished difference Result 67 states and 89 transitions. [2022-03-20 13:36:18,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 13:36:18,529 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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 31 [2022-03-20 13:36:18,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:18,529 INFO L225 Difference]: With dead ends: 67 [2022-03-20 13:36:18,529 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 13:36:18,530 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 13:36:18,530 INFO L913 BasicCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:18,530 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 158 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-20 13:36:18,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 13:36:18,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2022-03-20 13:36:18,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 25 states have call successors, (25), 7 states have call predecessors, (25), 6 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2022-03-20 13:36:18,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 85 transitions. [2022-03-20 13:36:18,540 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 85 transitions. Word has length 31 [2022-03-20 13:36:18,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:18,540 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 85 transitions. [2022-03-20 13:36:18,540 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 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) [2022-03-20 13:36:18,540 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 85 transitions. [2022-03-20 13:36:18,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-03-20 13:36:18,541 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:18,541 INFO L499 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:36:18,552 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 13:36:18,747 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 [2022-03-20 13:36:18,748 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:18,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:18,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1928736347, now seen corresponding path program 1 times [2022-03-20 13:36:18,748 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:18,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1147172733] [2022-03-20 13:36:18,750 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-03-20 13:36:18,750 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-03-20 13:36:18,750 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-03-20 13:36:18,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1928736347, now seen corresponding path program 2 times [2022-03-20 13:36:18,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:18,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989218422] [2022-03-20 13:36:18,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:18,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:18,758 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 13:36:18,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1972835826] [2022-03-20 13:36:18,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 13:36:18,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:36:18,759 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:18,762 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:36:18,763 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process