/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/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 14:33:53,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 14:33:53,922 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 14:33:53,966 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 14:33:54,001 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 14:33:54,007 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 14:33:54,007 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 14:33:54,011 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 14:33:54,011 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 14:33:54,011 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 14:33:54,011 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 14:33:54,011 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 14:33:54,012 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 14:33:54,012 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 14:33:54,013 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 14:33:54,013 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 14:33:54,013 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 14:33:54,013 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 14:33:54,013 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 14:33:54,013 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 14:33:54,013 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 14:33:54,159 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 14:33:54,182 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 14:33:54,184 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 14:33:54,185 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 14:33:54,186 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 14:33:54,186 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2022-04-06 14:33:54,241 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8c54f4e0/a265ebb04af84a2aa5d9313bc50a79d3/FLAG24942dc56 [2022-04-06 14:33:54,585 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 14:33:54,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2022-04-06 14:33:54,590 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8c54f4e0/a265ebb04af84a2aa5d9313bc50a79d3/FLAG24942dc56 [2022-04-06 14:33:55,003 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8c54f4e0/a265ebb04af84a2aa5d9313bc50a79d3 [2022-04-06 14:33:55,005 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 14:33:55,006 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 14:33:55,007 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 14:33:55,007 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 14:33:55,013 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 14:33:55,014 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,015 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6173675f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55, skipping insertion in model container [2022-04-06 14:33:55,015 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,020 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 14:33:55,030 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 14:33:55,120 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2022-04-06 14:33:55,134 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 14:33:55,139 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 14:33:55,156 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2022-04-06 14:33:55,159 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 14:33:55,192 INFO L208 MainTranslator]: Completed translation [2022-04-06 14:33:55,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55 WrapperNode [2022-04-06 14:33:55,193 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 14:33:55,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 14:33:55,193 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 14:33:55,193 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 14:33:55,201 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,208 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,208 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,211 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,214 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,215 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,216 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 14:33:55,216 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 14:33:55,217 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 14:33:55,217 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 14:33:55,218 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (1/1) ... [2022-04-06 14:33:55,222 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 14:33:55,231 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:55,248 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 14:33:55,267 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 14:33:55,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 14:33:55,297 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 14:33:55,297 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 14:33:55,297 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 14:33:55,297 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 14:33:55,297 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 14:33:55,297 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 14:33:55,298 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 14:33:55,298 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 14:33:55,298 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 14:33:55,299 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 14:33:55,299 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 14:33:55,300 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 14:33:55,300 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 14:33:55,300 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 14:33:55,300 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 14:33:55,300 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 14:33:55,341 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 14:33:55,342 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 14:33:55,416 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 14:33:55,420 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 14:33:55,420 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-04-06 14:33:55,421 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 02:33:55 BoogieIcfgContainer [2022-04-06 14:33:55,421 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 14:33:55,422 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 14:33:55,422 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 14:33:55,427 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 14:33:55,427 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 02:33:55" (1/3) ... [2022-04-06 14:33:55,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e1191b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 02:33:55, skipping insertion in model container [2022-04-06 14:33:55,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:33:55" (2/3) ... [2022-04-06 14:33:55,428 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e1191b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 02:33:55, skipping insertion in model container [2022-04-06 14:33:55,428 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 02:33:55" (3/3) ... [2022-04-06 14:33:55,429 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2022-04-06 14:33:55,432 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 14:33:55,432 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 14:33:55,458 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 14:33:55,462 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 14:33:55,464 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 14:33:55,472 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 14:33:55,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-06 14:33:55,476 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:55,477 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:55,477 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:55,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:55,480 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2022-04-06 14:33:55,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:55,485 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [406361465] [2022-04-06 14:33:55,492 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 14:33:55,493 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 2 times [2022-04-06 14:33:55,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:55,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092515845] [2022-04-06 14:33:55,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:55,496 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:55,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:55,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,637 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 14:33:55,637 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:55,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092515845] [2022-04-06 14:33:55,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092515845] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:55,638 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:55,638 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 14:33:55,640 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:55,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [406361465] [2022-04-06 14:33:55,641 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [406361465] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:55,641 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:55,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-06 14:33:55,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013000441] [2022-04-06 14:33:55,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:55,644 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-06 14:33:55,644 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:55,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-06 14:33:55,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-06 14:33:55,675 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:55,721 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-04-06 14:33:55,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-06 14:33:55,725 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-06 14:33:55,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:55,730 INFO L225 Difference]: With dead ends: 29 [2022-04-06 14:33:55,730 INFO L226 Difference]: Without dead ends: 12 [2022-04-06 14:33:55,732 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 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 14:33:55,735 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:55,736 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:55,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-04-06 14:33:55,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-04-06 14:33:55,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-04-06 14:33:55,766 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2022-04-06 14:33:55,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:55,766 INFO L478 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-04-06 14:33:55,767 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,767 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-04-06 14:33:55,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-04-06 14:33:55,768 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:55,768 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:55,769 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 14:33:55,769 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:55,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:55,771 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2022-04-06 14:33:55,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:55,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1770580855] [2022-04-06 14:33:55,774 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 14:33:55,774 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 2 times [2022-04-06 14:33:55,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:55,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567145876] [2022-04-06 14:33:55,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:55,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:55,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,850 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,864 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 14:33:55,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:55,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567145876] [2022-04-06 14:33:55,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567145876] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:55,865 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:55,865 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 14:33:55,865 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:55,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1770580855] [2022-04-06 14:33:55,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1770580855] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:55,866 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:55,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 14:33:55,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269032142] [2022-04-06 14:33:55,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:55,867 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 14:33:55,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:55,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 14:33:55,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 14:33:55,867 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:55,893 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-04-06 14:33:55,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 14:33:55,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-04-06 14:33:55,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:55,894 INFO L225 Difference]: With dead ends: 18 [2022-04-06 14:33:55,894 INFO L226 Difference]: Without dead ends: 13 [2022-04-06 14:33:55,895 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 14:33:55,896 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:55,897 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:55,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-04-06 14:33:55,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-04-06 14:33:55,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-04-06 14:33:55,901 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-04-06 14:33:55,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:55,901 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-04-06 14:33:55,901 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:55,901 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-04-06 14:33:55,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-06 14:33:55,901 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:55,902 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:55,902 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 14:33:55,902 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:55,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:55,903 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2022-04-06 14:33:55,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:55,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [160277754] [2022-04-06 14:33:55,916 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:55,916 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:55,917 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:55,917 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 2 times [2022-04-06 14:33:55,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:55,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30023643] [2022-04-06 14:33:55,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:55,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:55,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:55,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:55,972 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:55,972 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:55,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30023643] [2022-04-06 14:33:55,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30023643] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:33:55,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572053203] [2022-04-06 14:33:55,973 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:33:55,973 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:55,973 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:55,992 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 14:33:56,005 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 14:33:56,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:33:56,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:33:56,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2022-04-06 14:33:56,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:33:56,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:56,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:33:56,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:56,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572053203] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:33:56,235 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:33:56,235 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 11 [2022-04-06 14:33:56,236 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:56,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [160277754] [2022-04-06 14:33:56,236 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [160277754] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:56,236 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:56,236 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 14:33:56,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852433087] [2022-04-06 14:33:56,237 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:56,237 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 14:33:56,237 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:56,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 14:33:56,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2022-04-06 14:33:56,244 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:56,285 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2022-04-06 14:33:56,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 14:33:56,286 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-06 14:33:56,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:56,286 INFO L225 Difference]: With dead ends: 19 [2022-04-06 14:33:56,286 INFO L226 Difference]: Without dead ends: 14 [2022-04-06 14:33:56,287 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2022-04-06 14:33:56,288 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:56,288 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:56,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-04-06 14:33:56,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-04-06 14:33:56,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-04-06 14:33:56,291 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-04-06 14:33:56,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:56,291 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-04-06 14:33:56,291 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,291 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-04-06 14:33:56,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-04-06 14:33:56,292 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:56,292 INFO L499 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:56,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 14:33:56,509 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 [2022-04-06 14:33:56,509 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:56,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:56,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 3 times [2022-04-06 14:33:56,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:56,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [919107671] [2022-04-06 14:33:56,512 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:56,512 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:56,512 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:56,512 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 4 times [2022-04-06 14:33:56,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:56,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644245273] [2022-04-06 14:33:56,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:56,513 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:56,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:56,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:56,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:56,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:56,619 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:56,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644245273] [2022-04-06 14:33:56,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644245273] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:33:56,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409502624] [2022-04-06 14:33:56,619 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:33:56,619 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:56,620 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:56,620 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 14:33:56,636 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 14:33:56,659 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:33:56,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:33:56,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-06 14:33:56,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:33:56,722 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:56,722 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:33:56,799 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:56,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409502624] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:33:56,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:33:56,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 14 [2022-04-06 14:33:56,800 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:56,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [919107671] [2022-04-06 14:33:56,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [919107671] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:56,801 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:56,801 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 14:33:56,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630452915] [2022-04-06 14:33:56,801 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:56,801 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 14:33:56,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:56,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 14:33:56,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-04-06 14:33:56,802 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:56,855 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-04-06 14:33:56,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 14:33:56,855 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-04-06 14:33:56,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:56,855 INFO L225 Difference]: With dead ends: 20 [2022-04-06 14:33:56,856 INFO L226 Difference]: Without dead ends: 15 [2022-04-06 14:33:56,856 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2022-04-06 14:33:56,857 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:56,857 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:56,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-04-06 14:33:56,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-04-06 14:33:56,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-04-06 14:33:56,860 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-04-06 14:33:56,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:56,860 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-04-06 14:33:56,860 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:56,860 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-04-06 14:33:56,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-06 14:33:56,861 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:56,861 INFO L499 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:56,877 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-04-06 14:33:57,077 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 [2022-04-06 14:33:57,077 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:57,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:57,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 5 times [2022-04-06 14:33:57,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:57,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [460035573] [2022-04-06 14:33:57,080 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:57,080 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:57,080 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:57,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 6 times [2022-04-06 14:33:57,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:57,080 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800457110] [2022-04-06 14:33:57,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:57,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:57,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:57,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:57,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:57,167 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,167 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:57,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800457110] [2022-04-06 14:33:57,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1800457110] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:33:57,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497795068] [2022-04-06 14:33:57,168 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 14:33:57,168 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:57,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:57,174 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 14:33:57,175 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 14:33:57,200 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-04-06 14:33:57,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:33:57,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 11 conjunts are in the unsatisfiable core [2022-04-06 14:33:57,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:33:57,260 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,261 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:33:57,347 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497795068] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:33:57,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:33:57,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 17 [2022-04-06 14:33:57,348 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:57,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [460035573] [2022-04-06 14:33:57,348 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [460035573] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:57,348 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:57,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 14:33:57,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110596411] [2022-04-06 14:33:57,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:57,349 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 14:33:57,349 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:57,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 14:33:57,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2022-04-06 14:33:57,349 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:57,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:57,417 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-04-06 14:33:57,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 14:33:57,418 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-04-06 14:33:57,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:57,418 INFO L225 Difference]: With dead ends: 21 [2022-04-06 14:33:57,418 INFO L226 Difference]: Without dead ends: 16 [2022-04-06 14:33:57,419 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-04-06 14:33:57,419 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:57,419 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:57,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-04-06 14:33:57,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-04-06 14:33:57,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:57,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-04-06 14:33:57,422 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-04-06 14:33:57,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:57,422 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-04-06 14:33:57,422 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:57,423 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-04-06 14:33:57,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-06 14:33:57,423 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:57,423 INFO L499 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:57,444 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 14:33:57,639 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 [2022-04-06 14:33:57,640 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:57,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:57,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 7 times [2022-04-06 14:33:57,640 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:57,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [763634353] [2022-04-06 14:33:57,642 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:57,642 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:57,642 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:57,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 8 times [2022-04-06 14:33:57,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:57,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803959349] [2022-04-06 14:33:57,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:57,642 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:57,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:57,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:57,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:57,703 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,703 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:57,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803959349] [2022-04-06 14:33:57,703 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803959349] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:33:57,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680169171] [2022-04-06 14:33:57,703 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:33:57,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:57,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:57,708 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 14:33:57,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:33:57,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:33:57,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-06 14:33:57,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:33:57,761 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 14:33:57,822 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:33:57,932 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:57,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680169171] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:33:57,932 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:33:57,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 20 [2022-04-06 14:33:57,933 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:57,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [763634353] [2022-04-06 14:33:57,933 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [763634353] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:57,933 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:57,933 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 14:33:57,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693535875] [2022-04-06 14:33:57,933 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:57,933 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 14:33:57,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:57,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 14:33:57,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2022-04-06 14:33:57,934 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:58,017 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-04-06 14:33:58,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 14:33:58,017 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-06 14:33:58,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:58,018 INFO L225 Difference]: With dead ends: 22 [2022-04-06 14:33:58,018 INFO L226 Difference]: Without dead ends: 17 [2022-04-06 14:33:58,018 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2022-04-06 14:33:58,019 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:58,019 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:58,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-06 14:33:58,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-06 14:33:58,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-04-06 14:33:58,022 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-04-06 14:33:58,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:58,022 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-04-06 14:33:58,022 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,022 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-04-06 14:33:58,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-04-06 14:33:58,022 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:58,022 INFO L499 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:58,041 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-04-06 14:33:58,240 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:58,241 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:58,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:58,241 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 9 times [2022-04-06 14:33:58,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:58,241 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1034512975] [2022-04-06 14:33:58,243 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:58,243 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:58,243 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:58,243 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 10 times [2022-04-06 14:33:58,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:58,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934329404] [2022-04-06 14:33:58,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:58,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:58,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:58,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:33:58,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:33:58,326 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:58,326 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:33:58,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934329404] [2022-04-06 14:33:58,326 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934329404] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:33:58,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624140319] [2022-04-06 14:33:58,326 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:33:58,326 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:58,327 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:33:58,327 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 14:33:58,370 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:33:58,370 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:33:58,370 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 14:33:58,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 14:33:58,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:33:58,466 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:58,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:33:58,648 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 14:33:58,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624140319] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:33:58,649 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:33:58,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 23 [2022-04-06 14:33:58,649 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:33:58,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1034512975] [2022-04-06 14:33:58,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1034512975] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:33:58,649 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:33:58,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 14:33:58,650 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990416855] [2022-04-06 14:33:58,650 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:33:58,650 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 14:33:58,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:58,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 14:33:58,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-04-06 14:33:58,651 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:33:58,754 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-04-06 14:33:58,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 14:33:58,755 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-04-06 14:33:58,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:33:58,755 INFO L225 Difference]: With dead ends: 23 [2022-04-06 14:33:58,755 INFO L226 Difference]: Without dead ends: 18 [2022-04-06 14:33:58,756 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=699, Unknown=0, NotChecked=0, Total=812 [2022-04-06 14:33:58,756 INFO L913 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:33:58,756 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:33:58,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-04-06 14:33:58,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-04-06 14:33:58,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-04-06 14:33:58,759 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-04-06 14:33:58,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:33:58,759 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-04-06 14:33:58,759 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:33:58,759 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-04-06 14:33:58,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 14:33:58,760 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:33:58,760 INFO L499 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:33:58,776 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-06 14:33:58,967 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:33:58,967 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:33:58,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:33:58,968 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 11 times [2022-04-06 14:33:58,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:33:58,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1906762017] [2022-04-06 14:33:58,969 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:33:58,969 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2022-04-06 14:33:58,969 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:33:58,970 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 12 times [2022-04-06 14:33:58,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:33:58,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641940467] [2022-04-06 14:33:58,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:33:58,970 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:33:58,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 14:33:58,980 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-04-06 14:33:58,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 14:33:58,999 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-04-06 14:33:58,999 INFO L130 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found a feasible trace [2022-04-06 14:33:58,999 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-04-06 14:33:59,000 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-04-06 14:33:59,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-04-06 14:33:59,004 INFO L719 BasicCegarLoop]: Path program histogram: [12, 2, 2] [2022-04-06 14:33:59,005 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-04-06 14:33:59,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 02:33:59 BoogieIcfgContainer [2022-04-06 14:33:59,012 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-04-06 14:33:59,012 INFO L158 Benchmark]: Toolchain (without parser) took 4005.90ms. Allocated memory was 221.2MB in the beginning and 271.6MB in the end (delta: 50.3MB). Free memory was 195.1MB in the beginning and 203.7MB in the end (delta: -8.6MB). Peak memory consumption was 41.9MB. Max. memory is 8.0GB. [2022-04-06 14:33:59,012 INFO L158 Benchmark]: CDTParser took 0.09ms. Allocated memory is still 221.2MB. Free memory is still 183.4MB. There was no memory consumed. Max. memory is 8.0GB. [2022-04-06 14:33:59,012 INFO L158 Benchmark]: CACSL2BoogieTranslator took 185.92ms. Allocated memory is still 221.2MB. Free memory was 194.9MB in the beginning and 195.6MB in the end (delta: -659.2kB). Peak memory consumption was 10.1MB. Max. memory is 8.0GB. [2022-04-06 14:33:59,012 INFO L158 Benchmark]: Boogie Preprocessor took 22.66ms. Allocated memory is still 221.2MB. Free memory was 195.6MB in the beginning and 194.1MB in the end (delta: 1.5MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-04-06 14:33:59,013 INFO L158 Benchmark]: RCFGBuilder took 204.59ms. Allocated memory is still 221.2MB. Free memory was 194.1MB in the beginning and 184.6MB in the end (delta: 9.4MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. [2022-04-06 14:33:59,013 INFO L158 Benchmark]: TraceAbstraction took 3589.62ms. Allocated memory was 221.2MB in the beginning and 271.6MB in the end (delta: 50.3MB). Free memory was 184.1MB in the beginning and 203.7MB in the end (delta: -19.6MB). Peak memory consumption was 31.8MB. Max. memory is 8.0GB. [2022-04-06 14:33:59,013 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09ms. Allocated memory is still 221.2MB. Free memory is still 183.4MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 185.92ms. Allocated memory is still 221.2MB. Free memory was 194.9MB in the beginning and 195.6MB in the end (delta: -659.2kB). Peak memory consumption was 10.1MB. Max. memory is 8.0GB. * Boogie Preprocessor took 22.66ms. Allocated memory is still 221.2MB. Free memory was 195.6MB in the beginning and 194.1MB in the end (delta: 1.5MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 204.59ms. Allocated memory is still 221.2MB. Free memory was 194.1MB in the beginning and 184.6MB in the end (delta: 9.4MB). Peak memory consumption was 9.4MB. Max. memory is 8.0GB. * TraceAbstraction took 3589.62ms. Allocated memory was 221.2MB in the beginning and 271.6MB in the end (delta: 50.3MB). Free memory was 184.1MB in the beginning and 203.7MB in the end (delta: -19.6MB). Peak memory consumption was 31.8MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L21] CALL __VERIFIER_assert(y != 64) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.5s, OverallIterations: 8, TraceHistogramMax: 6, PathProgramHistogramMax: 12, EmptinessCheckTime: 0.0s, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 46 SdHoareTripleChecker+Valid, 0.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 45 mSDsluCounter, 188 SdHoareTripleChecker+Invalid, 0.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 105 mSDsCounter, 50 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 176 IncrementalHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 50 mSolverCounterUnsat, 83 mSDtfsCounter, 176 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 205 GetRequests, 101 SyntacticMatches, 5 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=18occurred in iteration=0, InterpolantAutomatonStates: 42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-04-06 14:33:59,024 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request...