/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 19:30:39,822 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 19:30:39,824 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 19:30:39,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-04-06 19:30:39,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 19:30:39,929 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 19:30:39,931 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 19:30:39,932 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-04-06 19:30:39,946 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 19:30:39,947 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 19:30:39,948 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 19:30:39,948 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 19:30:39,948 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 19:30:39,949 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 19:30:39,949 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 19:30:39,949 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 19:30:39,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 19:30:39,950 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 19:30:39,950 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 19:30:39,950 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 19:30:39,950 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 19:30:39,951 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 19:30:39,951 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 19:30:39,952 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-04-06 19:30:39,952 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 19:30:40,163 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 19:30:40,199 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 19:30:40,201 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 19:30:40,202 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 19:30:40,202 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 19:30:40,204 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2022-04-06 19:30:40,262 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d48125ef5/1bc40b84c1e04065b94a8415e166a542/FLAG9d95c895e [2022-04-06 19:30:40,690 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 19:30:40,691 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2022-04-06 19:30:40,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d48125ef5/1bc40b84c1e04065b94a8415e166a542/FLAG9d95c895e [2022-04-06 19:30:41,078 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d48125ef5/1bc40b84c1e04065b94a8415e166a542 [2022-04-06 19:30:41,080 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 19:30:41,082 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 19:30:41,083 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 19:30:41,084 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 19:30:41,086 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 19:30:41,087 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,088 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b567855 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41, skipping insertion in model container [2022-04-06 19:30:41,088 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,094 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 19:30:41,107 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 19:30:41,262 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2022-04-06 19:30:41,300 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 19:30:41,309 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 19:30:41,325 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2022-04-06 19:30:41,350 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 19:30:41,366 INFO L208 MainTranslator]: Completed translation [2022-04-06 19:30:41,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41 WrapperNode [2022-04-06 19:30:41,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 19:30:41,368 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 19:30:41,368 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 19:30:41,369 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 19:30:41,379 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,393 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,393 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,408 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,413 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,423 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 19:30:41,424 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 19:30:41,424 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 19:30:41,424 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 19:30:41,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (1/1) ... [2022-04-06 19:30:41,432 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 19:30:41,442 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 19:30:41,461 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 19:30:41,486 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 19:30:41,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 19:30:41,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 19:30:41,502 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 19:30:41,503 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-04-06 19:30:41,503 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 19:30:41,503 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 19:30:41,503 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 19:30:41,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 19:30:41,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-04-06 19:30:41,503 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-04-06 19:30:41,504 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 19:30:41,504 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 19:30:41,504 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-04-06 19:30:41,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 19:30:41,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-04-06 19:30:41,506 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 19:30:41,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 19:30:41,593 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 19:30:41,595 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 19:30:41,778 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 19:30:41,783 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 19:30:41,784 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2022-04-06 19:30:41,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 07:30:41 BoogieIcfgContainer [2022-04-06 19:30:41,785 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 19:30:41,787 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 19:30:41,787 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 19:30:41,790 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 19:30:41,790 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 07:30:41" (1/3) ... [2022-04-06 19:30:41,791 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a938e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 07:30:41, skipping insertion in model container [2022-04-06 19:30:41,791 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 07:30:41" (2/3) ... [2022-04-06 19:30:41,792 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a938e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 07:30:41, skipping insertion in model container [2022-04-06 19:30:41,792 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 07:30:41" (3/3) ... [2022-04-06 19:30:41,793 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2022-04-06 19:30:41,797 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 19:30:41,798 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 19:30:41,859 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 19:30:41,865 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 19:30:41,865 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 19:30:41,885 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 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 19:30:41,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-04-06 19:30:41,903 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:41,904 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:41,906 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:41,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:41,915 INFO L85 PathProgramCache]: Analyzing trace with hash 739829093, now seen corresponding path program 1 times [2022-04-06 19:30:41,924 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:41,925 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [318081743] [2022-04-06 19:30:41,936 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 19:30:41,936 INFO L85 PathProgramCache]: Analyzing trace with hash 739829093, now seen corresponding path program 2 times [2022-04-06 19:30:41,939 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:41,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667956840] [2022-04-06 19:30:41,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:41,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:42,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:42,180 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 19:30:42,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:42,193 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 19:30:42,194 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 19:30:42,194 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667956840] [2022-04-06 19:30:42,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1667956840] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:42,195 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:42,195 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 19:30:42,198 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 19:30:42,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [318081743] [2022-04-06 19:30:42,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [318081743] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:42,199 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:42,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 19:30:42,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886498848] [2022-04-06 19:30:42,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 19:30:42,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 19:30:42,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:42,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 19:30:42,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 19:30:42,236 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 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 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 19:30:42,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 19:30:42,416 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2022-04-06 19:30:42,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 19:30:42,418 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 22 [2022-04-06 19:30:42,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 19:30:42,425 INFO L225 Difference]: With dead ends: 73 [2022-04-06 19:30:42,426 INFO L226 Difference]: Without dead ends: 36 [2022-04-06 19:30:42,428 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 19:30:42,431 INFO L913 BasicCegarLoop]: 36 mSDtfsCounter, 47 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 19:30:42,433 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 45 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 19:30:42,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-04-06 19:30:42,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2022-04-06 19:30:42,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 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 19:30:42,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2022-04-06 19:30:42,466 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2022-04-06 19:30:42,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 19:30:42,467 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2022-04-06 19:30:42,467 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 19:30:42,467 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2022-04-06 19:30:42,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-04-06 19:30:42,468 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:42,468 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:42,468 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 19:30:42,469 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:42,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:42,469 INFO L85 PathProgramCache]: Analyzing trace with hash -1075962823, now seen corresponding path program 1 times [2022-04-06 19:30:42,470 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:42,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [474108194] [2022-04-06 19:30:42,477 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-04-06 19:30:42,477 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 19:30:42,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1075962823, now seen corresponding path program 2 times [2022-04-06 19:30:42,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:42,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613152428] [2022-04-06 19:30:42,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:42,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:42,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:42,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 19:30:42,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:42,553 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 19:30:42,553 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 19:30:42,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613152428] [2022-04-06 19:30:42,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613152428] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 19:30:42,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228726211] [2022-04-06 19:30:42,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 19:30:42,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:42,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 19:30:42,557 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 19:30:42,571 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 19:30:42,638 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 19:30:42,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 19:30:42,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2022-04-06 19:30:42,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 19:30:42,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 19:30:42,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 19:30:42,826 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 19:30:42,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228726211] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 19:30:42,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 19:30:42,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-06 19:30:42,828 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 19:30:42,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [474108194] [2022-04-06 19:30:42,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [474108194] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:42,829 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:42,829 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 19:30:42,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027183797] [2022-04-06 19:30:42,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 19:30:42,830 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 19:30:42,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:42,830 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 19:30:42,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-04-06 19:30:42,831 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 19:30:42,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 19:30:42,916 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2022-04-06 19:30:42,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 19:30:42,916 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 28 [2022-04-06 19:30:42,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 19:30:42,917 INFO L225 Difference]: With dead ends: 65 [2022-04-06 19:30:42,918 INFO L226 Difference]: Without dead ends: 44 [2022-04-06 19:30:42,918 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-04-06 19:30:42,919 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 48 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 19:30:42,920 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 32 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 19:30:42,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-04-06 19:30:42,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2022-04-06 19:30:42,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 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 19:30:42,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2022-04-06 19:30:42,936 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2022-04-06 19:30:42,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 19:30:42,936 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2022-04-06 19:30:42,936 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 19:30:42,936 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2022-04-06 19:30:42,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-04-06 19:30:42,937 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:42,937 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:42,979 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 19:30:43,175 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:43,176 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:43,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:43,176 INFO L85 PathProgramCache]: Analyzing trace with hash 875420793, now seen corresponding path program 3 times [2022-04-06 19:30:43,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:43,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1652701735] [2022-04-06 19:30:43,178 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-04-06 19:30:43,178 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 19:30:43,178 INFO L85 PathProgramCache]: Analyzing trace with hash 875420793, now seen corresponding path program 4 times [2022-04-06 19:30:43,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:43,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015628893] [2022-04-06 19:30:43,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:43,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:43,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:43,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 19:30:43,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:43,255 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 19:30:43,256 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 19:30:43,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015628893] [2022-04-06 19:30:43,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015628893] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 19:30:43,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329226610] [2022-04-06 19:30:43,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 19:30:43,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:43,257 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 19:30:43,258 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 19:30:43,283 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 19:30:43,341 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 19:30:43,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 19:30:43,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-06 19:30:43,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 19:30:43,415 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 19:30:43,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 19:30:43,493 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 19:30:43,493 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329226610] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 19:30:43,494 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 19:30:43,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2022-04-06 19:30:43,494 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 19:30:43,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1652701735] [2022-04-06 19:30:43,494 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1652701735] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:43,495 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:43,495 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 19:30:43,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334068530] [2022-04-06 19:30:43,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 19:30:43,495 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 19:30:43,495 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:43,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 19:30:43,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-04-06 19:30:43,496 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 19:30:43,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 19:30:43,597 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2022-04-06 19:30:43,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 19:30:43,597 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 32 [2022-04-06 19:30:43,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 19:30:43,598 INFO L225 Difference]: With dead ends: 75 [2022-04-06 19:30:43,598 INFO L226 Difference]: Without dead ends: 52 [2022-04-06 19:30:43,599 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=77, Unknown=0, NotChecked=0, Total=132 [2022-04-06 19:30:43,600 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 63 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 19:30:43,601 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 32 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 19:30:43,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-06 19:30:43,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2022-04-06 19:30:43,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 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 19:30:43,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2022-04-06 19:30:43,609 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2022-04-06 19:30:43,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 19:30:43,609 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2022-04-06 19:30:43,610 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 19:30:43,610 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2022-04-06 19:30:43,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-04-06 19:30:43,610 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:43,611 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:43,638 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 19:30:43,827 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-04-06 19:30:43,828 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:43,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:43,828 INFO L85 PathProgramCache]: Analyzing trace with hash 133934009, now seen corresponding path program 5 times [2022-04-06 19:30:43,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:43,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1007595852] [2022-04-06 19:30:43,830 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-04-06 19:30:43,830 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 19:30:43,831 INFO L85 PathProgramCache]: Analyzing trace with hash 133934009, now seen corresponding path program 6 times [2022-04-06 19:30:43,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:43,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978868976] [2022-04-06 19:30:43,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:43,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:43,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:43,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 19:30:43,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:43,909 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 19:30:43,910 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 19:30:43,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978868976] [2022-04-06 19:30:43,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978868976] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 19:30:43,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639055293] [2022-04-06 19:30:43,910 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 19:30:43,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:43,911 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 19:30:43,912 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 19:30:43,913 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 19:30:43,985 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-04-06 19:30:43,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 19:30:43,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-06 19:30:43,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 19:30:44,051 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 19:30:44,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 19:30:44,124 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 19:30:44,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639055293] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 19:30:44,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 19:30:44,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 9 [2022-04-06 19:30:44,125 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 19:30:44,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1007595852] [2022-04-06 19:30:44,125 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1007595852] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:44,125 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:44,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 19:30:44,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848161995] [2022-04-06 19:30:44,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 19:30:44,126 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 19:30:44,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:44,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 19:30:44,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-04-06 19:30:44,127 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 19:30:44,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 19:30:44,266 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2022-04-06 19:30:44,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 19:30:44,267 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 36 [2022-04-06 19:30:44,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 19:30:44,269 INFO L225 Difference]: With dead ends: 85 [2022-04-06 19:30:44,269 INFO L226 Difference]: Without dead ends: 60 [2022-04-06 19:30:44,270 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2022-04-06 19:30:44,274 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 82 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 19:30:44,275 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 32 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 19:30:44,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-06 19:30:44,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2022-04-06 19:30:44,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 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 19:30:44,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2022-04-06 19:30:44,297 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2022-04-06 19:30:44,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 19:30:44,297 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2022-04-06 19:30:44,297 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 19:30:44,297 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2022-04-06 19:30:44,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-04-06 19:30:44,298 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:44,298 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:44,325 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 19:30:44,499 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:44,499 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:44,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:44,500 INFO L85 PathProgramCache]: Analyzing trace with hash 173558265, now seen corresponding path program 7 times [2022-04-06 19:30:44,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:44,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1898374559] [2022-04-06 19:30:44,501 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-04-06 19:30:44,501 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 19:30:44,502 INFO L85 PathProgramCache]: Analyzing trace with hash 173558265, now seen corresponding path program 8 times [2022-04-06 19:30:44,502 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:44,502 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [766169707] [2022-04-06 19:30:44,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:44,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:44,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:44,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 19:30:44,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 19:30:44,604 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 19:30:44,605 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 19:30:44,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [766169707] [2022-04-06 19:30:44,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [766169707] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 19:30:44,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23775661] [2022-04-06 19:30:44,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 19:30:44,606 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:44,606 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 19:30:44,607 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 19:30:44,608 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 19:30:44,685 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 19:30:44,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 19:30:44,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 6 conjunts are in the unsatisfiable core [2022-04-06 19:30:44,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 19:30:44,765 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 19:30:44,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 19:30:44,843 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 19:30:44,843 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23775661] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 19:30:44,843 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 19:30:44,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 9 [2022-04-06 19:30:44,844 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 19:30:44,844 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1898374559] [2022-04-06 19:30:44,844 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1898374559] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 19:30:44,844 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 19:30:44,844 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 19:30:44,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657350525] [2022-04-06 19:30:44,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 19:30:44,845 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 19:30:44,845 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:44,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 19:30:44,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2022-04-06 19:30:44,846 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 19:30:45,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 19:30:45,008 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2022-04-06 19:30:45,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 19:30:45,009 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 40 [2022-04-06 19:30:45,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 19:30:45,010 INFO L225 Difference]: With dead ends: 93 [2022-04-06 19:30:45,010 INFO L226 Difference]: Without dead ends: 66 [2022-04-06 19:30:45,010 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2022-04-06 19:30:45,011 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 71 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 19:30:45,011 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 42 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 19:30:45,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-04-06 19:30:45,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2022-04-06 19:30:45,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 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 19:30:45,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-04-06 19:30:45,020 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2022-04-06 19:30:45,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 19:30:45,021 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-04-06 19:30:45,021 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 19:30:45,021 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-04-06 19:30:45,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-04-06 19:30:45,022 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 19:30:45,022 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 19:30:45,047 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 19:30:45,246 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 19:30:45,247 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 19:30:45,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 19:30:45,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1461422279, now seen corresponding path program 9 times [2022-04-06 19:30:45,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 19:30:45,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2096413966] [2022-04-06 19:30:45,250 INFO L97 AcceleratorQvasr]: Qvasr could not accelerate loop because java.lang.UnsupportedOperationException: Qvasr do not support arrays. [2022-04-06 19:30:45,250 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 19:30:45,250 INFO L85 PathProgramCache]: Analyzing trace with hash -1461422279, now seen corresponding path program 10 times [2022-04-06 19:30:45,250 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 19:30:45,250 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226338942] [2022-04-06 19:30:45,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 19:30:45,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 19:30:45,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 19:30:45,292 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-04-06 19:30:45,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 19:30:45,368 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-04-06 19:30:45,368 INFO L130 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found a feasible trace [2022-04-06 19:30:45,369 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-04-06 19:30:45,371 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-04-06 19:30:45,373 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-04-06 19:30:45,378 INFO L719 BasicCegarLoop]: Path program histogram: [10, 2] [2022-04-06 19:30:45,380 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-04-06 19:30:45,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 07:30:45 BoogieIcfgContainer [2022-04-06 19:30:45,401 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-04-06 19:30:45,402 INFO L158 Benchmark]: Toolchain (without parser) took 4319.85ms. Allocated memory was 174.1MB in the beginning and 209.7MB in the end (delta: 35.7MB). Free memory was 122.9MB in the beginning and 145.6MB in the end (delta: -22.7MB). Peak memory consumption was 12.5MB. Max. memory is 8.0GB. [2022-04-06 19:30:45,403 INFO L158 Benchmark]: CDTParser took 0.21ms. Allocated memory is still 174.1MB. Free memory was 139.3MB in the beginning and 139.2MB in the end (delta: 78.6kB). There was no memory consumed. Max. memory is 8.0GB. [2022-04-06 19:30:45,403 INFO L158 Benchmark]: CACSL2BoogieTranslator took 284.13ms. Allocated memory is still 174.1MB. Free memory was 122.8MB in the beginning and 149.4MB in the end (delta: -26.6MB). Peak memory consumption was 11.9MB. Max. memory is 8.0GB. [2022-04-06 19:30:45,404 INFO L158 Benchmark]: Boogie Preprocessor took 55.06ms. Allocated memory is still 174.1MB. Free memory was 149.4MB in the beginning and 147.6MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-04-06 19:30:45,404 INFO L158 Benchmark]: RCFGBuilder took 361.28ms. Allocated memory is still 174.1MB. Free memory was 147.6MB in the beginning and 135.4MB in the end (delta: 12.2MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. [2022-04-06 19:30:45,404 INFO L158 Benchmark]: TraceAbstraction took 3614.15ms. Allocated memory was 174.1MB in the beginning and 209.7MB in the end (delta: 35.7MB). Free memory was 134.7MB in the beginning and 145.6MB in the end (delta: -11.0MB). Peak memory consumption was 25.7MB. Max. memory is 8.0GB. [2022-04-06 19:30:45,406 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21ms. Allocated memory is still 174.1MB. Free memory was 139.3MB in the beginning and 139.2MB in the end (delta: 78.6kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 284.13ms. Allocated memory is still 174.1MB. Free memory was 122.8MB in the beginning and 149.4MB in the end (delta: -26.6MB). Peak memory consumption was 11.9MB. Max. memory is 8.0GB. * Boogie Preprocessor took 55.06ms. Allocated memory is still 174.1MB. Free memory was 149.4MB in the beginning and 147.6MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 361.28ms. Allocated memory is still 174.1MB. Free memory was 147.6MB in the beginning and 135.4MB in the end (delta: 12.2MB). Peak memory consumption was 12.6MB. Max. memory is 8.0GB. * TraceAbstraction took 3614.15ms. Allocated memory was 174.1MB in the beginning and 209.7MB in the end (delta: 35.7MB). Free memory was 134.7MB in the beginning and 145.6MB in the end (delta: -11.0MB). Peak memory consumption was 25.7MB. 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 - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)<