/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7968f31 [2022-03-17 14:40:06,408 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-17 14:40:06,415 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-17 14:40:06,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-17 14:40:06,479 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-17 14:40:06,481 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-17 14:40:06,481 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-17 14:40:06,483 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-17 14:40:06,484 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-17 14:40:06,484 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-17 14:40:06,486 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-17 14:40:06,490 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-17 14:40:06,491 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-17 14:40:06,492 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-17 14:40:06,493 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-17 14:40:06,493 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-17 14:40:06,494 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-17 14:40:06,499 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-17 14:40:06,505 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-17 14:40:06,506 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-17 14:40:06,507 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-17 14:40:06,507 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-03-17 14:40:06,514 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-17 14:40:06,514 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-17 14:40:06,516 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-17 14:40:06,516 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-17 14:40:06,516 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-17 14:40:06,517 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-17 14:40:06,518 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 14:40:06,518 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-17 14:40:06,518 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-17 14:40:06,519 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-03-17 14:40:06,519 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-17 14:40:06,709 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-17 14:40:06,726 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-17 14:40:06,728 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-17 14:40:06,728 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-17 14:40:06,729 INFO L275 PluginConnector]: CDTParser initialized [2022-03-17 14:40:06,730 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2022-03-17 14:40:06,767 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72b8e9d1e/c57db9f9903b4e16bebf689074f96fde/FLAGcae16b581 [2022-03-17 14:40:07,076 INFO L306 CDTParser]: Found 1 translation units. [2022-03-17 14:40:07,077 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2022-03-17 14:40:07,081 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72b8e9d1e/c57db9f9903b4e16bebf689074f96fde/FLAGcae16b581 [2022-03-17 14:40:07,511 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72b8e9d1e/c57db9f9903b4e16bebf689074f96fde [2022-03-17 14:40:07,512 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-17 14:40:07,513 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-03-17 14:40:07,514 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-17 14:40:07,514 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-17 14:40:07,516 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-17 14:40:07,517 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,517 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cb93ee5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07, skipping insertion in model container [2022-03-17 14:40:07,517 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-17 14:40:07,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-17 14:40:07,637 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/invert_string-1.c[352,365] [2022-03-17 14:40:07,663 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 14:40:07,668 INFO L203 MainTranslator]: Completed pre-run [2022-03-17 14:40:07,679 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/invert_string-1.c[352,365] [2022-03-17 14:40:07,710 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-17 14:40:07,719 INFO L208 MainTranslator]: Completed translation [2022-03-17 14:40:07,719 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07 WrapperNode [2022-03-17 14:40:07,719 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-17 14:40:07,720 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-17 14:40:07,720 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-17 14:40:07,720 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-17 14:40:07,727 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,727 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,731 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,731 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,735 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,744 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-17 14:40:07,745 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-17 14:40:07,745 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-17 14:40:07,745 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-17 14:40:07,747 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (1/1) ... [2022-03-17 14:40:07,760 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-17 14:40:07,767 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:07,791 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-17 14:40:07,809 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-17 14:40:07,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-17 14:40:07,824 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-17 14:40:07,824 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-17 14:40:07,825 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-17 14:40:07,825 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-17 14:40:07,825 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-17 14:40:07,825 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-17 14:40:07,825 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-17 14:40:07,825 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-17 14:40:07,826 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-17 14:40:07,826 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-03-17 14:40:07,826 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-17 14:40:07,826 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-17 14:40:07,826 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-17 14:40:07,827 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-17 14:40:07,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-17 14:40:07,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-17 14:40:07,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-17 14:40:07,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-17 14:40:07,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-17 14:40:07,894 INFO L234 CfgBuilder]: Building ICFG [2022-03-17 14:40:07,895 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-17 14:40:08,034 INFO L275 CfgBuilder]: Performing block encoding [2022-03-17 14:40:08,038 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-17 14:40:08,038 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-17 14:40:08,039 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 02:40:08 BoogieIcfgContainer [2022-03-17 14:40:08,039 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-17 14:40:08,040 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-03-17 14:40:08,040 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-03-17 14:40:08,041 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-03-17 14:40:08,043 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 02:40:08" (1/1) ... [2022-03-17 14:40:08,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 02:40:08 BasicIcfg [2022-03-17 14:40:08,060 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-03-17 14:40:08,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-17 14:40:08,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-17 14:40:08,077 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-17 14:40:08,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.03 02:40:07" (1/4) ... [2022-03-17 14:40:08,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@204331d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:40:08, skipping insertion in model container [2022-03-17 14:40:08,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.03 02:40:07" (2/4) ... [2022-03-17 14:40:08,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@204331d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.03 02:40:08, skipping insertion in model container [2022-03-17 14:40:08,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.03 02:40:08" (3/4) ... [2022-03-17 14:40:08,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@204331d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.03 02:40:08, skipping insertion in model container [2022-03-17 14:40:08,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 17.03 02:40:08" (4/4) ... [2022-03-17 14:40:08,080 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.cJordan [2022-03-17 14:40:08,084 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-03-17 14:40:08,084 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-17 14:40:08,130 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-17 14:40:08,136 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-17 14:40:08,136 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-17 14:40:08,152 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 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) [2022-03-17 14:40:08,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-17 14:40:08,161 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:08,161 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:08,162 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:08,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:08,166 INFO L85 PathProgramCache]: Analyzing trace with hash 1459888189, now seen corresponding path program 1 times [2022-03-17 14:40:08,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:08,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137031618] [2022-03-17 14:40:08,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:08,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:08,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:08,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:08,346 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:08,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137031618] [2022-03-17 14:40:08,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137031618] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 14:40:08,347 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 14:40:08,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-17 14:40:08,349 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278525282] [2022-03-17 14:40:08,349 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 14:40:08,353 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-17 14:40:08,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:08,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-17 14:40:08,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-17 14:40:08,379 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 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 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 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) [2022-03-17 14:40:08,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:08,408 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2022-03-17 14:40:08,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-17 14:40:08,410 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 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 17 [2022-03-17 14:40:08,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:08,419 INFO L225 Difference]: With dead ends: 29 [2022-03-17 14:40:08,419 INFO L226 Difference]: Without dead ends: 24 [2022-03-17 14:40:08,420 INFO L911 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 [2022-03-17 14:40:08,424 INFO L912 BasicCegarLoop]: 30 mSDtfsCounter, 22 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 33 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 [2022-03-17 14:40:08,425 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 33 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 14:40:08,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-17 14:40:08,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-17 14:40:08,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-17 14:40:08,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-03-17 14:40:08,448 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-03-17 14:40:08,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:08,448 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-03-17 14:40:08,449 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 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) [2022-03-17 14:40:08,449 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-03-17 14:40:08,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-17 14:40:08,450 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:08,450 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:08,450 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-17 14:40:08,450 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:08,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:08,452 INFO L85 PathProgramCache]: Analyzing trace with hash -1257013952, now seen corresponding path program 1 times [2022-03-17 14:40:08,453 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:08,453 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650440921] [2022-03-17 14:40:08,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:08,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:08,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:08,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,519 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:08,519 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:08,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650440921] [2022-03-17 14:40:08,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650440921] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 14:40:08,520 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 14:40:08,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-17 14:40:08,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768727827] [2022-03-17 14:40:08,520 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 14:40:08,521 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-17 14:40:08,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:08,522 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-17 14:40:08,522 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-03-17 14:40:08,522 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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) [2022-03-17 14:40:08,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:08,613 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2022-03-17 14:40:08,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-17 14:40:08,613 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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 17 [2022-03-17 14:40:08,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:08,615 INFO L225 Difference]: With dead ends: 30 [2022-03-17 14:40:08,615 INFO L226 Difference]: Without dead ends: 30 [2022-03-17 14:40:08,615 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-03-17 14:40:08,616 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 40 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:08,617 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 24 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 14:40:08,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-17 14:40:08,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2022-03-17 14:40:08,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-17 14:40:08,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-17 14:40:08,622 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-03-17 14:40:08,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:08,622 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-17 14:40:08,622 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 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) [2022-03-17 14:40:08,623 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-17 14:40:08,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-17 14:40:08,623 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:08,623 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:08,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-17 14:40:08,624 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:08,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:08,624 INFO L85 PathProgramCache]: Analyzing trace with hash 313528638, now seen corresponding path program 1 times [2022-03-17 14:40:08,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:08,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662787446] [2022-03-17 14:40:08,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:08,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:08,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:08,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-17 14:40:08,718 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:08,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662787446] [2022-03-17 14:40:08,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662787446] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-17 14:40:08,718 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-17 14:40:08,718 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-17 14:40:08,718 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645255893] [2022-03-17 14:40:08,719 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-17 14:40:08,719 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-17 14:40:08,719 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:08,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-17 14:40:08,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-17 14:40:08,720 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (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) [2022-03-17 14:40:08,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:08,783 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-03-17 14:40:08,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-17 14:40:08,784 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (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 19 [2022-03-17 14:40:08,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:08,784 INFO L225 Difference]: With dead ends: 26 [2022-03-17 14:40:08,784 INFO L226 Difference]: Without dead ends: 26 [2022-03-17 14:40:08,784 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-03-17 14:40:08,785 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 27 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:08,786 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 27 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-17 14:40:08,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-17 14:40:08,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-17 14:40:08,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-03-17 14:40:08,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-03-17 14:40:08,789 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2022-03-17 14:40:08,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:08,789 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-03-17 14:40:08,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (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) [2022-03-17 14:40:08,789 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-03-17 14:40:08,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-17 14:40:08,790 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:08,790 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:08,790 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-17 14:40:08,790 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:08,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:08,790 INFO L85 PathProgramCache]: Analyzing trace with hash -617930468, now seen corresponding path program 1 times [2022-03-17 14:40:08,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:08,791 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740447425] [2022-03-17 14:40:08,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:08,791 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:08,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:09,128 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:09,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:09,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:09,144 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:09,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740447425] [2022-03-17 14:40:09,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [740447425] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:09,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615773109] [2022-03-17 14:40:09,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:09,145 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:09,145 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:09,148 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:09,149 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-17 14:40:09,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:09,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-17 14:40:09,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:09,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-17 14:40:09,430 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2022-03-17 14:40:09,535 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-03-17 14:40:09,562 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:09,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:09,627 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-17 14:40:09,629 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-17 14:40:09,642 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-17 14:40:09,653 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-17 14:40:09,653 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-17 14:40:09,831 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:09,832 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615773109] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:09,832 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:09,832 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 22 [2022-03-17 14:40:09,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542622878] [2022-03-17 14:40:09,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:09,834 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-17 14:40:09,834 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:09,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-17 14:40:09,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-03-17 14:40:09,837 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:10,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:10,313 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2022-03-17 14:40:10,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-17 14:40:10,314 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-17 14:40:10,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:10,315 INFO L225 Difference]: With dead ends: 52 [2022-03-17 14:40:10,315 INFO L226 Difference]: Without dead ends: 52 [2022-03-17 14:40:10,315 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 30 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=287, Invalid=1119, Unknown=0, NotChecked=0, Total=1406 [2022-03-17 14:40:10,316 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 82 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:10,316 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 56 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-17 14:40:10,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-17 14:40:10,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 39. [2022-03-17 14:40:10,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-17 14:40:10,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2022-03-17 14:40:10,320 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2022-03-17 14:40:10,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:10,321 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2022-03-17 14:40:10,321 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 19 states have internal predecessors, (33), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:10,321 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2022-03-17 14:40:10,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-17 14:40:10,321 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:10,321 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:10,353 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-17 14:40:10,540 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:10,540 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:10,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:10,541 INFO L85 PathProgramCache]: Analyzing trace with hash 809600538, now seen corresponding path program 2 times [2022-03-17 14:40:10,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:10,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477374463] [2022-03-17 14:40:10,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:10,541 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:10,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:10,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:10,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:10,612 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:10,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:10,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477374463] [2022-03-17 14:40:10,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477374463] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:10,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124835731] [2022-03-17 14:40:10,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-17 14:40:10,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:10,613 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:10,618 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:10,619 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-17 14:40:10,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-17 14:40:10,663 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 14:40:10,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-17 14:40:10,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:10,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:10,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:10,747 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:10,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [124835731] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:10,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:10,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 7 [2022-03-17 14:40:10,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342641818] [2022-03-17 14:40:10,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:10,748 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-17 14:40:10,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:10,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-17 14:40:10,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-03-17 14:40:10,748 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:10,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:10,850 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-03-17 14:40:10,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-17 14:40:10,851 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-17 14:40:10,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:10,853 INFO L225 Difference]: With dead ends: 48 [2022-03-17 14:40:10,853 INFO L226 Difference]: Without dead ends: 48 [2022-03-17 14:40:10,853 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=122, Unknown=0, NotChecked=0, Total=182 [2022-03-17 14:40:10,855 INFO L912 BasicCegarLoop]: 24 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:10,855 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 36 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 14:40:10,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-17 14:40:10,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2022-03-17 14:40:10,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 33 states have (on average 1.1515151515151516) internal successors, (38), 34 states have internal predecessors, (38), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-17 14:40:10,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2022-03-17 14:40:10,859 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2022-03-17 14:40:10,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:10,860 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2022-03-17 14:40:10,860 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:10,860 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2022-03-17 14:40:10,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-17 14:40:10,860 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:10,860 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:10,876 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-17 14:40:11,070 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:11,070 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:11,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:11,071 INFO L85 PathProgramCache]: Analyzing trace with hash -634204424, now seen corresponding path program 3 times [2022-03-17 14:40:11,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:11,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [109181445] [2022-03-17 14:40:11,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:11,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:11,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:11,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:11,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:11,338 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:11,338 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:11,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [109181445] [2022-03-17 14:40:11,338 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [109181445] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:11,338 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [881731604] [2022-03-17 14:40:11,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-03-17 14:40:11,339 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:11,339 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:11,340 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:11,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-17 14:40:11,394 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-03-17 14:40:11,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 14:40:11,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-17 14:40:11,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:11,418 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-17 14:40:11,552 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-03-17 14:40:11,591 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-17 14:40:11,681 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-17 14:40:11,682 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-17 14:40:11,714 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:11,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:13,076 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 128 treesize of output 108 [2022-03-17 14:40:13,096 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-17 14:40:13,096 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 201 treesize of output 179 [2022-03-17 14:40:13,299 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:13,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [881731604] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:13,299 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:13,300 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 35 [2022-03-17 14:40:13,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120227539] [2022-03-17 14:40:13,300 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:13,300 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-17 14:40:13,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:13,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-17 14:40:13,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1047, Unknown=2, NotChecked=0, Total=1190 [2022-03-17 14:40:13,301 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:14,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:14,312 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2022-03-17 14:40:14,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-17 14:40:14,313 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-17 14:40:14,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:14,314 INFO L225 Difference]: With dead ends: 78 [2022-03-17 14:40:14,314 INFO L226 Difference]: Without dead ends: 78 [2022-03-17 14:40:14,316 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 850 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=560, Invalid=3098, Unknown=2, NotChecked=0, Total=3660 [2022-03-17 14:40:14,316 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 76 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 978 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:14,316 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 122 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 978 Invalid, 0 Unknown, 48 Unchecked, 0.4s Time] [2022-03-17 14:40:14,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-03-17 14:40:14,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 46. [2022-03-17 14:40:14,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-17 14:40:14,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2022-03-17 14:40:14,320 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2022-03-17 14:40:14,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:14,320 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2022-03-17 14:40:14,321 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.5294117647058822) internal successors, (52), 32 states have internal predecessors, (52), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:14,321 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2022-03-17 14:40:14,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-17 14:40:14,321 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:14,321 INFO L500 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:14,349 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-17 14:40:14,537 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:14,537 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:14,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:14,538 INFO L85 PathProgramCache]: Analyzing trace with hash 1131578614, now seen corresponding path program 4 times [2022-03-17 14:40:14,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:14,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818756937] [2022-03-17 14:40:14,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:14,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:14,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:14,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:14,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:14,595 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:14,595 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:14,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818756937] [2022-03-17 14:40:14,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818756937] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:14,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437514767] [2022-03-17 14:40:14,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-17 14:40:14,595 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:14,595 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:14,608 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:14,608 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-17 14:40:14,688 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-17 14:40:14,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 14:40:14,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-17 14:40:14,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:14,702 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-03-17 14:40:14,796 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-03-17 14:40:14,916 INFO L356 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2022-03-17 14:40:14,916 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2022-03-17 14:40:14,955 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-17 14:40:14,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:15,046 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-03-17 14:40:15,047 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 26 [2022-03-17 14:40:15,058 INFO L356 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-03-17 14:40:15,058 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 29 [2022-03-17 14:40:15,069 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 24 [2022-03-17 14:40:15,163 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-03-17 14:40:15,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437514767] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:15,164 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:15,164 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-03-17 14:40:15,164 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687273949] [2022-03-17 14:40:15,164 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:15,165 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-17 14:40:15,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:15,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-17 14:40:15,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-03-17 14:40:15,166 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:16,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:16,749 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2022-03-17 14:40:16,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-17 14:40:16,749 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-17 14:40:16,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:16,750 INFO L225 Difference]: With dead ends: 114 [2022-03-17 14:40:16,750 INFO L226 Difference]: Without dead ends: 111 [2022-03-17 14:40:16,752 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1387 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=935, Invalid=4615, Unknown=0, NotChecked=0, Total=5550 [2022-03-17 14:40:16,752 INFO L912 BasicCegarLoop]: 20 mSDtfsCounter, 116 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 941 mSolverCounterSat, 258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 1199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 258 IncrementalHoareTripleChecker+Valid, 941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:16,752 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 89 Invalid, 1199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [258 Valid, 941 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-17 14:40:16,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-17 14:40:16,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 71. [2022-03-17 14:40:16,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 59 states have (on average 1.1694915254237288) internal successors, (69), 62 states have internal predecessors, (69), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-17 14:40:16,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2022-03-17 14:40:16,757 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 27 [2022-03-17 14:40:16,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:16,758 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2022-03-17 14:40:16,758 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:16,758 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2022-03-17 14:40:16,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-17 14:40:16,759 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:16,759 INFO L500 BasicCegarLoop]: trace histogram [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] [2022-03-17 14:40:16,781 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-17 14:40:16,974 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:16,974 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:16,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:16,975 INFO L85 PathProgramCache]: Analyzing trace with hash -468461934, now seen corresponding path program 1 times [2022-03-17 14:40:16,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:16,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681578663] [2022-03-17 14:40:16,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:16,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:16,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,021 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:17,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-17 14:40:17,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,030 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-17 14:40:17,030 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:17,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681578663] [2022-03-17 14:40:17,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681578663] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:17,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878908034] [2022-03-17 14:40:17,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:17,031 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:17,031 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:17,032 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:17,033 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-17 14:40:17,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-17 14:40:17,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:17,128 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-17 14:40:17,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:17,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-03-17 14:40:17,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878908034] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:17,171 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:17,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 12 [2022-03-17 14:40:17,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122174468] [2022-03-17 14:40:17,171 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:17,171 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-17 14:40:17,172 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:17,172 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-17 14:40:17,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2022-03-17 14:40:17,172 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-17 14:40:17,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:17,315 INFO L93 Difference]: Finished difference Result 100 states and 116 transitions. [2022-03-17 14:40:17,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-17 14:40:17,322 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 29 [2022-03-17 14:40:17,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:17,322 INFO L225 Difference]: With dead ends: 100 [2022-03-17 14:40:17,322 INFO L226 Difference]: Without dead ends: 75 [2022-03-17 14:40:17,323 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=339, Unknown=0, NotChecked=0, Total=462 [2022-03-17 14:40:17,323 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 45 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:17,323 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 42 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 124 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 14:40:17,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-17 14:40:17,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 67. [2022-03-17 14:40:17,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 58 states have internal predecessors, (63), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-17 14:40:17,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2022-03-17 14:40:17,327 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 29 [2022-03-17 14:40:17,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:17,327 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2022-03-17 14:40:17,327 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-03-17 14:40:17,327 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2022-03-17 14:40:17,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-17 14:40:17,328 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:17,328 INFO L500 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:17,344 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-03-17 14:40:17,546 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:17,547 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:17,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:17,547 INFO L85 PathProgramCache]: Analyzing trace with hash -812414670, now seen corresponding path program 5 times [2022-03-17 14:40:17,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:17,547 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382709050] [2022-03-17 14:40:17,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:17,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:17,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-17 14:40:17,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-17 14:40:17,611 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:17,611 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-17 14:40:17,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382709050] [2022-03-17 14:40:17,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382709050] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-17 14:40:17,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257940437] [2022-03-17 14:40:17,612 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-03-17 14:40:17,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:17,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-17 14:40:17,613 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-17 14:40:17,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-17 14:40:17,666 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2022-03-17 14:40:17,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-17 14:40:17,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2022-03-17 14:40:17,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-17 14:40:17,715 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:17,715 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-17 14:40:17,764 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-17 14:40:17,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257940437] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-17 14:40:17,764 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-17 14:40:17,764 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 8] total 10 [2022-03-17 14:40:17,765 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777226871] [2022-03-17 14:40:17,765 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-03-17 14:40:17,765 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-17 14:40:17,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-17 14:40:17,765 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-17 14:40:17,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=59, Unknown=0, NotChecked=0, Total=90 [2022-03-17 14:40:17,765 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:17,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-17 14:40:17,920 INFO L93 Difference]: Finished difference Result 106 states and 120 transitions. [2022-03-17 14:40:17,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-17 14:40:17,921 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-17 14:40:17,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-17 14:40:17,922 INFO L225 Difference]: With dead ends: 106 [2022-03-17 14:40:17,922 INFO L226 Difference]: Without dead ends: 106 [2022-03-17 14:40:17,922 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 65 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=274, Unknown=0, NotChecked=0, Total=420 [2022-03-17 14:40:17,922 INFO L912 BasicCegarLoop]: 15 mSDtfsCounter, 78 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-17 14:40:17,923 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 32 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 128 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-17 14:40:17,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-03-17 14:40:17,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 75. [2022-03-17 14:40:17,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 63 states have (on average 1.1111111111111112) internal successors, (70), 66 states have internal predecessors, (70), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-17 14:40:17,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2022-03-17 14:40:17,927 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 31 [2022-03-17 14:40:17,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-17 14:40:17,928 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2022-03-17 14:40:17,928 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-17 14:40:17,928 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2022-03-17 14:40:17,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-17 14:40:17,928 INFO L492 BasicCegarLoop]: Found error trace [2022-03-17 14:40:17,928 INFO L500 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-17 14:40:17,945 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-17 14:40:18,143 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-17 14:40:18,143 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-17 14:40:18,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-17 14:40:18,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1779570578, now seen corresponding path program 2 times [2022-03-17 14:40:18,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-17 14:40:18,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708873893] [2022-03-17 14:40:18,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-17 14:40:18,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-17 14:40:18,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-17 14:40:18,169 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-17 14:40:18,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-17 14:40:18,198 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-17 14:40:18,198 INFO L614 BasicCegarLoop]: Counterexample is feasible [2022-03-17 14:40:18,198 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-17 14:40:18,199 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-03-17 14:40:18,201 INFO L718 BasicCegarLoop]: Path program histogram: [5, 2, 1, 1, 1] [2022-03-17 14:40:18,203 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-17 14:40:18,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.03 02:40:18 BasicIcfg [2022-03-17 14:40:18,223 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-17 14:40:18,223 INFO L158 Benchmark]: Toolchain (without parser) took 10710.08ms. Allocated memory was 172.0MB in the beginning and 241.2MB in the end (delta: 69.2MB). Free memory was 116.2MB in the beginning and 161.3MB in the end (delta: -45.2MB). Peak memory consumption was 25.2MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,223 INFO L158 Benchmark]: CDTParser took 0.09ms. Allocated memory is still 172.0MB. Free memory is still 132.0MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-17 14:40:18,224 INFO L158 Benchmark]: CACSL2BoogieTranslator took 205.25ms. Allocated memory was 172.0MB in the beginning and 241.2MB in the end (delta: 69.2MB). Free memory was 115.9MB in the beginning and 215.7MB in the end (delta: -99.8MB). Peak memory consumption was 14.3MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,224 INFO L158 Benchmark]: Boogie Preprocessor took 24.32ms. Allocated memory is still 241.2MB. Free memory was 215.7MB in the beginning and 214.0MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,224 INFO L158 Benchmark]: RCFGBuilder took 294.66ms. Allocated memory is still 241.2MB. Free memory was 214.0MB in the beginning and 202.1MB in the end (delta: 11.9MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,224 INFO L158 Benchmark]: IcfgTransformer took 20.71ms. Allocated memory is still 241.2MB. Free memory was 202.1MB in the beginning and 201.1MB in the end (delta: 1.0MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,224 INFO L158 Benchmark]: TraceAbstraction took 10161.14ms. Allocated memory is still 241.2MB. Free memory was 200.5MB in the beginning and 161.3MB in the end (delta: 39.2MB). Peak memory consumption was 40.3MB. Max. memory is 8.0GB. [2022-03-17 14:40:18,225 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 172.0MB. Free memory is still 132.0MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 205.25ms. Allocated memory was 172.0MB in the beginning and 241.2MB in the end (delta: 69.2MB). Free memory was 115.9MB in the beginning and 215.7MB in the end (delta: -99.8MB). Peak memory consumption was 14.3MB. Max. memory is 8.0GB. * Boogie Preprocessor took 24.32ms. Allocated memory is still 241.2MB. Free memory was 215.7MB in the beginning and 214.0MB in the end (delta: 1.7MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 294.66ms. Allocated memory is still 241.2MB. Free memory was 214.0MB in the beginning and 202.1MB in the end (delta: 11.9MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * IcfgTransformer took 20.71ms. Allocated memory is still 241.2MB. Free memory was 202.1MB in the beginning and 201.1MB in the end (delta: 1.0MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * TraceAbstraction took 10161.14ms. Allocated memory is still 241.2MB. Free memory was 200.5MB in the beginning and 161.3MB in the end (delta: 39.2MB). Peak memory consumption was 40.3MB. 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: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={5:0}, str2={4:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={5:0}, str2={4:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={5:0}, str2={4:0}] [L35] COND TRUE i