/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/loopacceleration/qvasr/qvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-7390193 [2022-04-05 05:59:44,851 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-05 05:59:44,868 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-05 05:59:44,895 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-05 05:59:44,895 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-05 05:59:44,896 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-05 05:59:44,896 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-05 05:59:44,897 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-05 05:59:44,898 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-05 05:59:44,899 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-05 05:59:44,899 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-05 05:59:44,900 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2022-04-05 05:59:44,913 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-05 05:59:44,914 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-05 05:59:44,914 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-05 05:59:44,915 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/loopacceleration/qvasr/qvasr_64.epf [2022-04-05 05:59:44,928 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-05 05:59:44,928 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-05 05:59:44,928 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-04-05 05:59:44,928 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-04-05 05:59:44,929 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * Use SBE=true [2022-04-05 05:59:44,929 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-05 05:59:44,929 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-05 05:59:44,930 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 05:59:44,930 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-04-05 05:59:44,930 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-04-05 05:59:44,931 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-04-05 05:59:44,931 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_QVASR WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-05 05:59:45,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-05 05:59:45,084 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-05 05:59:45,085 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-05 05:59:45,086 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-05 05:59:45,086 INFO L275 PluginConnector]: CDTParser initialized [2022-04-05 05:59:45,088 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2022-04-05 05:59:45,132 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446b6a44/60ac50fc234346cbb0f5033e76ebffbf/FLAG41bda61df [2022-04-05 05:59:45,481 INFO L306 CDTParser]: Found 1 translation units. [2022-04-05 05:59:45,481 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_14.c [2022-04-05 05:59:45,484 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446b6a44/60ac50fc234346cbb0f5033e76ebffbf/FLAG41bda61df [2022-04-05 05:59:45,492 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7446b6a44/60ac50fc234346cbb0f5033e76ebffbf [2022-04-05 05:59:45,493 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-05 05:59:45,495 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-04-05 05:59:45,496 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-05 05:59:45,496 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-05 05:59:45,498 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-05 05:59:45,498 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,499 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4584f707 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45, skipping insertion in model container [2022-04-05 05:59:45,499 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,503 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-05 05:59:45,512 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-05 05:59:45,620 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-crafted-1/mono-crafted_14.c[319,332] [2022-04-05 05:59:45,641 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 05:59:45,646 INFO L203 MainTranslator]: Completed pre-run [2022-04-05 05:59:45,652 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-crafted-1/mono-crafted_14.c[319,332] [2022-04-05 05:59:45,654 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-05 05:59:45,662 INFO L208 MainTranslator]: Completed translation [2022-04-05 05:59:45,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45 WrapperNode [2022-04-05 05:59:45,662 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-05 05:59:45,663 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-05 05:59:45,664 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-05 05:59:45,664 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-05 05:59:45,670 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,670 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,679 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,679 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,681 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,684 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,684 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,690 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-05 05:59:45,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-05 05:59:45,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-05 05:59:45,691 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-05 05:59:45,692 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-05 05:59:45,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:45,711 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-04-05 05:59:45,712 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-04-05 05:59:45,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-05 05:59:45,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-05 05:59:45,738 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-05 05:59:45,738 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-05 05:59:45,738 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-05 05:59:45,738 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-05 05:59:45,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-05 05:59:45,739 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-05 05:59:45,739 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-05 05:59:45,739 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-05 05:59:45,779 INFO L234 CfgBuilder]: Building ICFG [2022-04-05 05:59:45,780 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-05 05:59:45,845 INFO L275 CfgBuilder]: Performing block encoding [2022-04-05 05:59:45,848 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-05 05:59:45,849 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-04-05 05:59:45,850 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:59:45 BoogieIcfgContainer [2022-04-05 05:59:45,850 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-05 05:59:45,851 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-04-05 05:59:45,851 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-04-05 05:59:45,852 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-04-05 05:59:45,854 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:59:45" (1/1) ... [2022-04-05 05:59:45,855 INFO L168 ansformationObserver]: Applying ICFG transformation LOOP_ACCELERATION_QVASR [2022-04-05 05:59:45,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 05:59:45 BasicIcfg [2022-04-05 05:59:45,864 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-04-05 05:59:45,866 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-05 05:59:45,866 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-05 05:59:45,868 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-05 05:59:45,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 05.04 05:59:45" (1/4) ... [2022-04-05 05:59:45,868 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40ea4538 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 05:59:45, skipping insertion in model container [2022-04-05 05:59:45,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 05.04 05:59:45" (2/4) ... [2022-04-05 05:59:45,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40ea4538 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 05.04 05:59:45, skipping insertion in model container [2022-04-05 05:59:45,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 05.04 05:59:45" (3/4) ... [2022-04-05 05:59:45,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@40ea4538 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 05.04 05:59:45, skipping insertion in model container [2022-04-05 05:59:45,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 05.04 05:59:45" (4/4) ... [2022-04-05 05:59:45,884 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.cqvasr [2022-04-05 05:59:45,887 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-04-05 05:59:45,887 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-05 05:59:45,928 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-05 05:59:45,934 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-04-05 05:59:45,935 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-05 05:59:45,945 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-05 05:59:45,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-05 05:59:45,948 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:45,948 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:45,948 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:45,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:45,952 INFO L85 PathProgramCache]: Analyzing trace with hash -412568735, now seen corresponding path program 1 times [2022-04-05 05:59:45,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:45,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1176491041] [2022-04-05 05:59:45,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:45,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:46,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:46,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,097 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:59:46,097 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:46,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1176491041] [2022-04-05 05:59:46,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1176491041] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:59:46,098 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:59:46,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-04-05 05:59:46,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705712134] [2022-04-05 05:59:46,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:59:46,102 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-04-05 05:59:46,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:46,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-04-05 05:59:46,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 05:59:46,126 INFO L87 Difference]: Start difference. First operand has 22 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 4 states have call successors, (4), 3 states have call predecessors, (4), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:46,176 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2022-04-05 05:59:46,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-04-05 05:59:46,177 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-05 05:59:46,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:46,182 INFO L225 Difference]: With dead ends: 36 [2022-04-05 05:59:46,182 INFO L226 Difference]: Without dead ends: 17 [2022-04-05 05:59:46,185 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-04-05 05:59:46,188 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 14 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:46,189 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 26 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:59:46,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-04-05 05:59:46,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-04-05 05:59:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:46,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2022-04-05 05:59:46,220 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 12 [2022-04-05 05:59:46,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:46,221 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2022-04-05 05:59:46,221 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,221 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2022-04-05 05:59:46,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-04-05 05:59:46,222 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:46,222 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:46,223 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-05 05:59:46,223 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:46,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:46,225 INFO L85 PathProgramCache]: Analyzing trace with hash -383016063, now seen corresponding path program 1 times [2022-04-05 05:59:46,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:46,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975158199] [2022-04-05 05:59:46,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:46,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:46,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,293 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:46,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,311 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-05 05:59:46,312 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:46,312 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975158199] [2022-04-05 05:59:46,312 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975158199] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:59:46,312 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:59:46,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 05:59:46,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90543230] [2022-04-05 05:59:46,312 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:59:46,313 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 05:59:46,313 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:46,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 05:59:46,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 05:59:46,314 INFO L87 Difference]: Start difference. First operand 17 states and 20 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:46,355 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2022-04-05 05:59:46,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 05:59:46,355 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-04-05 05:59:46,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:46,356 INFO L225 Difference]: With dead ends: 30 [2022-04-05 05:59:46,356 INFO L226 Difference]: Without dead ends: 19 [2022-04-05 05:59:46,356 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-05 05:59:46,357 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 14 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:46,358 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 24 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:59:46,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-04-05 05:59:46,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-04-05 05:59:46,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:46,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2022-04-05 05:59:46,361 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 12 [2022-04-05 05:59:46,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:46,361 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2022-04-05 05:59:46,362 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,362 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2022-04-05 05:59:46,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-04-05 05:59:46,362 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:46,362 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:46,362 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-05 05:59:46,362 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:46,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:46,363 INFO L85 PathProgramCache]: Analyzing trace with hash 305534661, now seen corresponding path program 1 times [2022-04-05 05:59:46,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:46,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545477609] [2022-04-05 05:59:46,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:46,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:46,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:46,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:59:46,422 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:46,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545477609] [2022-04-05 05:59:46,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545477609] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-05 05:59:46,422 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-05 05:59:46,422 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-05 05:59:46,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144570259] [2022-04-05 05:59:46,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-05 05:59:46,423 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-05 05:59:46,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:46,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-05 05:59:46,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-05 05:59:46,424 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:46,453 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-04-05 05:59:46,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-05 05:59:46,453 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-04-05 05:59:46,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:46,454 INFO L225 Difference]: With dead ends: 28 [2022-04-05 05:59:46,454 INFO L226 Difference]: Without dead ends: 20 [2022-04-05 05:59:46,455 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-05 05:59:46,460 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 11 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:46,461 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 24 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:59:46,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-04-05 05:59:46,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-04-05 05:59:46,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:46,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2022-04-05 05:59:46,472 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 14 [2022-04-05 05:59:46,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:46,473 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2022-04-05 05:59:46,473 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:46,473 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2022-04-05 05:59:46,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-05 05:59:46,474 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:46,474 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:46,474 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-05 05:59:46,474 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:46,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:46,475 INFO L85 PathProgramCache]: Analyzing trace with hash 906513450, now seen corresponding path program 1 times [2022-04-05 05:59:46,475 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:46,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004157612] [2022-04-05 05:59:46,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:46,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:46,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,513 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:46,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:59:46,524 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:46,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004157612] [2022-04-05 05:59:46,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004157612] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:46,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482309186] [2022-04-05 05:59:46,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:46,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:46,525 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:46,527 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:46,527 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-05 05:59:46,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:46,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2022-04-05 05:59:46,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:46,622 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:59:46,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:46,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-05 05:59:46,663 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482309186] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:46,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:46,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-04-05 05:59:46,664 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945265525] [2022-04-05 05:59:46,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:46,664 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-05 05:59:46,664 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:46,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-05 05:59:46,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-04-05 05:59:46,665 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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) [2022-04-05 05:59:46,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:46,746 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2022-04-05 05:59:46,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-05 05:59:46,747 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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 15 [2022-04-05 05:59:46,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:46,747 INFO L225 Difference]: With dead ends: 37 [2022-04-05 05:59:46,747 INFO L226 Difference]: Without dead ends: 25 [2022-04-05 05:59:46,749 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-04-05 05:59:46,755 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:46,755 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 28 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:59:46,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-04-05 05:59:46,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-04-05 05:59:46,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 19 states have internal predecessors, (23), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:46,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-04-05 05:59:46,764 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2022-04-05 05:59:46,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:46,764 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-04-05 05:59:46,764 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 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) [2022-04-05 05:59:46,765 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-04-05 05:59:46,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-05 05:59:46,765 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:46,765 INFO L499 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:46,789 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:46,971 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 [2022-04-05 05:59:46,971 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:46,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:46,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1586204636, now seen corresponding path program 1 times [2022-04-05 05:59:46,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:46,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591077915] [2022-04-05 05:59:46,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:46,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:46,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:47,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:47,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:47,037 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,037 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:47,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591077915] [2022-04-05 05:59:47,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591077915] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:47,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448749983] [2022-04-05 05:59:47,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:47,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:47,040 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:47,042 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:47,044 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-05 05:59:47,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:47,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2022-04-05 05:59:47,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:47,131 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,131 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:47,186 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448749983] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:47,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:47,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-04-05 05:59:47,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408225288] [2022-04-05 05:59:47,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:47,189 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-05 05:59:47,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:47,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-05 05:59:47,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2022-04-05 05:59:47,189 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 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) [2022-04-05 05:59:47,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:47,275 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2022-04-05 05:59:47,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-05 05:59:47,276 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 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 21 [2022-04-05 05:59:47,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:47,276 INFO L225 Difference]: With dead ends: 48 [2022-04-05 05:59:47,276 INFO L226 Difference]: Without dead ends: 33 [2022-04-05 05:59:47,277 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2022-04-05 05:59:47,277 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:47,277 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 39 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-05 05:59:47,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-05 05:59:47,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-04-05 05:59:47,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 27 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:47,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2022-04-05 05:59:47,281 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 21 [2022-04-05 05:59:47,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:47,281 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2022-04-05 05:59:47,281 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 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) [2022-04-05 05:59:47,281 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2022-04-05 05:59:47,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-05 05:59:47,281 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:47,281 INFO L499 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:47,301 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:47,497 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 [2022-04-05 05:59:47,497 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:47,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:47,498 INFO L85 PathProgramCache]: Analyzing trace with hash -233424180, now seen corresponding path program 2 times [2022-04-05 05:59:47,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:47,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338725125] [2022-04-05 05:59:47,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:47,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:47,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:47,556 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:47,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:47,560 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,561 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:47,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338725125] [2022-04-05 05:59:47,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338725125] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:47,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177516546] [2022-04-05 05:59:47,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 05:59:47,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:47,561 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:47,562 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:47,563 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-05 05:59:47,591 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 05:59:47,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:59:47,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2022-04-05 05:59:47,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:47,642 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:47,749 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:47,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177516546] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:47,749 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:47,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 18 [2022-04-05 05:59:47,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815719656] [2022-04-05 05:59:47,750 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:47,750 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-04-05 05:59:47,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:47,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-04-05 05:59:47,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2022-04-05 05:59:47,751 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 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) [2022-04-05 05:59:47,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:47,936 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2022-04-05 05:59:47,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-04-05 05:59:47,936 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 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 29 [2022-04-05 05:59:47,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:47,937 INFO L225 Difference]: With dead ends: 64 [2022-04-05 05:59:47,937 INFO L226 Difference]: Without dead ends: 49 [2022-04-05 05:59:47,938 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=377, Invalid=615, Unknown=0, NotChecked=0, Total=992 [2022-04-05 05:59:47,938 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 26 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:47,938 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 39 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:59:47,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-04-05 05:59:47,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-04-05 05:59:47,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 42 states have (on average 1.119047619047619) internal successors, (47), 43 states have internal predecessors, (47), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:47,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2022-04-05 05:59:47,944 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 29 [2022-04-05 05:59:47,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:47,944 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2022-04-05 05:59:47,944 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.4444444444444446) internal successors, (44), 17 states have internal predecessors, (44), 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) [2022-04-05 05:59:47,944 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2022-04-05 05:59:47,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-05 05:59:47,945 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:47,945 INFO L499 BasicCegarLoop]: trace histogram [16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:47,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:48,153 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 [2022-04-05 05:59:48,153 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:48,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:48,154 INFO L85 PathProgramCache]: Analyzing trace with hash 2041954476, now seen corresponding path program 3 times [2022-04-05 05:59:48,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:48,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948024506] [2022-04-05 05:59:48,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:48,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:48,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:48,304 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:48,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:48,310 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 45 proven. 210 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-04-05 05:59:48,310 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:48,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948024506] [2022-04-05 05:59:48,310 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948024506] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:48,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375519417] [2022-04-05 05:59:48,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 05:59:48,311 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:48,311 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:48,313 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:48,322 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-05 05:59:48,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-05 05:59:48,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:59:48,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2022-04-05 05:59:48,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:48,435 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 46 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-05 05:59:48,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:48,532 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 46 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-04-05 05:59:48,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375519417] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:48,532 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:48,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 5, 5] total 24 [2022-04-05 05:59:48,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464416986] [2022-04-05 05:59:48,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:48,533 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-04-05 05:59:48,533 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:48,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-04-05 05:59:48,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=387, Unknown=0, NotChecked=0, Total=552 [2022-04-05 05:59:48,534 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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) [2022-04-05 05:59:48,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:48,840 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2022-04-05 05:59:48,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-04-05 05:59:48,840 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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 45 [2022-04-05 05:59:48,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:48,841 INFO L225 Difference]: With dead ends: 75 [2022-04-05 05:59:48,841 INFO L226 Difference]: Without dead ends: 60 [2022-04-05 05:59:48,842 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 321 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=584, Invalid=1308, Unknown=0, NotChecked=0, Total=1892 [2022-04-05 05:59:48,842 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 48 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:48,842 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 36 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:59:48,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-04-05 05:59:48,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2022-04-05 05:59:48,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 48 states have internal predecessors, (52), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:48,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2022-04-05 05:59:48,847 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2022-04-05 05:59:48,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:48,847 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2022-04-05 05:59:48,847 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5) internal successors, (60), 23 states have internal predecessors, (60), 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) [2022-04-05 05:59:48,847 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2022-04-05 05:59:48,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-04-05 05:59:48,848 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:48,848 INFO L499 BasicCegarLoop]: trace histogram [17, 15, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:48,866 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:49,059 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 [2022-04-05 05:59:49,059 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:49,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:49,060 INFO L85 PathProgramCache]: Analyzing trace with hash -829092473, now seen corresponding path program 4 times [2022-04-05 05:59:49,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:49,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760683272] [2022-04-05 05:59:49,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:49,060 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:49,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:49,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:49,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:49,205 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:49,205 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:49,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760683272] [2022-04-05 05:59:49,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760683272] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:49,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633881544] [2022-04-05 05:59:49,205 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 05:59:49,205 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:49,205 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:49,206 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:49,207 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-05 05:59:49,244 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 05:59:49,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:59:49,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 17 conjunts are in the unsatisfiable core [2022-04-05 05:59:49,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:49,326 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:49,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:49,648 INFO L134 CoverageAnalysis]: Checked inductivity of 299 backedges. 48 proven. 240 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:49,648 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633881544] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:49,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:49,649 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 36 [2022-04-05 05:59:49,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164081092] [2022-04-05 05:59:49,649 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:49,649 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-04-05 05:59:49,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:49,650 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-04-05 05:59:49,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2022-04-05 05:59:49,650 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 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) [2022-04-05 05:59:50,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:50,155 INFO L93 Difference]: Finished difference Result 106 states and 131 transitions. [2022-04-05 05:59:50,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-04-05 05:59:50,156 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 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 50 [2022-04-05 05:59:50,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:50,156 INFO L225 Difference]: With dead ends: 106 [2022-04-05 05:59:50,156 INFO L226 Difference]: Without dead ends: 88 [2022-04-05 05:59:50,158 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1718, Invalid=2838, Unknown=0, NotChecked=0, Total=4556 [2022-04-05 05:59:50,158 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 44 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:50,159 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-05 05:59:50,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-04-05 05:59:50,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2022-04-05 05:59:50,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 81 states have (on average 1.0617283950617284) internal successors, (86), 82 states have internal predecessors, (86), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:50,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2022-04-05 05:59:50,166 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 50 [2022-04-05 05:59:50,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:50,166 INFO L478 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2022-04-05 05:59:50,166 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.2222222222222223) internal successors, (80), 35 states have internal predecessors, (80), 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) [2022-04-05 05:59:50,166 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2022-04-05 05:59:50,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-04-05 05:59:50,167 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:50,167 INFO L499 BasicCegarLoop]: trace histogram [34, 32, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:50,185 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:50,383 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 [2022-04-05 05:59:50,383 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:50,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:50,384 INFO L85 PathProgramCache]: Analyzing trace with hash 1432513035, now seen corresponding path program 5 times [2022-04-05 05:59:50,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:50,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032100650] [2022-04-05 05:59:50,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:50,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:50,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:50,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:50,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:50,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:50,823 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:50,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032100650] [2022-04-05 05:59:50,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032100650] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:50,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1462437471] [2022-04-05 05:59:50,824 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 05:59:50,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:50,824 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:50,825 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) [2022-04-05 05:59:50,826 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-05 05:59:50,893 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 35 check-sat command(s) [2022-04-05 05:59:50,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:59:50,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 34 conjunts are in the unsatisfiable core [2022-04-05 05:59:50,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:51,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:51,026 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:52,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1166 backedges. 99 proven. 1056 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:52,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1462437471] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:52,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:52,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-04-05 05:59:52,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343162886] [2022-04-05 05:59:52,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:52,117 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-04-05 05:59:52,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:52,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-04-05 05:59:52,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2348, Invalid=2482, Unknown=0, NotChecked=0, Total=4830 [2022-04-05 05:59:52,119 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 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) [2022-04-05 05:59:53,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:53,755 INFO L93 Difference]: Finished difference Result 174 states and 216 transitions. [2022-04-05 05:59:53,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-04-05 05:59:53,755 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 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 84 [2022-04-05 05:59:53,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:53,756 INFO L225 Difference]: With dead ends: 174 [2022-04-05 05:59:53,756 INFO L226 Difference]: Without dead ends: 156 [2022-04-05 05:59:53,760 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2865 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6903, Invalid=11457, Unknown=0, NotChecked=0, Total=18360 [2022-04-05 05:59:53,760 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 78 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:53,760 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 59 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-04-05 05:59:53,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2022-04-05 05:59:53,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2022-04-05 05:59:53,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 149 states have (on average 1.0335570469798658) internal successors, (154), 150 states have internal predecessors, (154), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-05 05:59:53,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 160 transitions. [2022-04-05 05:59:53,772 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 160 transitions. Word has length 84 [2022-04-05 05:59:53,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:53,772 INFO L478 AbstractCegarLoop]: Abstraction has 156 states and 160 transitions. [2022-04-05 05:59:53,772 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 2.1142857142857143) internal successors, (148), 69 states have internal predecessors, (148), 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) [2022-04-05 05:59:53,772 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 160 transitions. [2022-04-05 05:59:53,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-04-05 05:59:53,774 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:53,774 INFO L499 BasicCegarLoop]: trace histogram [68, 66, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:53,799 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:53,989 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 [2022-04-05 05:59:53,990 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:53,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:53,990 INFO L85 PathProgramCache]: Analyzing trace with hash 59310099, now seen corresponding path program 6 times [2022-04-05 05:59:53,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:53,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719235220] [2022-04-05 05:59:53,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:53,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:54,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:55,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 05:59:55,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 05:59:55,392 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 201 proven. 4422 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-04-05 05:59:55,393 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 05:59:55,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719235220] [2022-04-05 05:59:55,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719235220] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 05:59:55,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721765491] [2022-04-05 05:59:55,393 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-05 05:59:55,393 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:55,393 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 05:59:55,394 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 05:59:55,395 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-05 05:59:55,435 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-05 05:59:55,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 05:59:55,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 13 conjunts are in the unsatisfiable core [2022-04-05 05:59:55,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 05:59:55,813 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 4624 trivial. 0 not checked. [2022-04-05 05:59:55,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 05:59:56,239 INFO L134 CoverageAnalysis]: Checked inductivity of 4634 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 4628 trivial. 0 not checked. [2022-04-05 05:59:56,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721765491] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 05:59:56,240 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 05:59:56,240 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 9, 6] total 79 [2022-04-05 05:59:56,240 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876808975] [2022-04-05 05:59:56,240 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 05:59:56,240 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-04-05 05:59:56,240 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 05:59:56,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-04-05 05:59:56,243 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2371, Invalid=3791, Unknown=0, NotChecked=0, Total=6162 [2022-04-05 05:59:56,243 INFO L87 Difference]: Start difference. First operand 156 states and 160 transitions. Second operand has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:58,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 05:59:58,627 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2022-04-05 05:59:58,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-04-05 05:59:58,628 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 152 [2022-04-05 05:59:58,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 05:59:58,629 INFO L225 Difference]: With dead ends: 186 [2022-04-05 05:59:58,629 INFO L226 Difference]: Without dead ends: 168 [2022-04-05 05:59:58,634 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 296 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3576 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=7377, Invalid=16493, Unknown=0, NotChecked=0, Total=23870 [2022-04-05 05:59:58,634 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 89 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 467 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 467 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-05 05:59:58,635 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [89 Valid, 89 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 467 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-05 05:59:58,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-04-05 05:59:58,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 164. [2022-04-05 05:59:58,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 155 states have (on average 1.038709677419355) internal successors, (161), 157 states have internal predecessors, (161), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 05:59:58,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 169 transitions. [2022-04-05 05:59:58,657 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 169 transitions. Word has length 152 [2022-04-05 05:59:58,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 05:59:58,657 INFO L478 AbstractCegarLoop]: Abstraction has 164 states and 169 transitions. [2022-04-05 05:59:58,657 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 2.1012658227848102) internal successors, (166), 77 states have internal predecessors, (166), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-05 05:59:58,657 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 169 transitions. [2022-04-05 05:59:58,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-04-05 05:59:58,658 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 05:59:58,658 INFO L499 BasicCegarLoop]: trace histogram [69, 67, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 05:59:58,677 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-04-05 05:59:58,872 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 05:59:58,873 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 05:59:58,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 05:59:58,873 INFO L85 PathProgramCache]: Analyzing trace with hash -321599528, now seen corresponding path program 7 times [2022-04-05 05:59:58,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 05:59:58,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724434079] [2022-04-05 05:59:58,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 05:59:58,873 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 05:59:58,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:00:00,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 06:00:00,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:00:00,263 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:00,263 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 06:00:00,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724434079] [2022-04-05 06:00:00,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724434079] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 06:00:00,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448148458] [2022-04-05 06:00:00,264 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-04-05 06:00:00,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:00:00,264 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 06:00:00,265 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 06:00:00,265 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-05 06:00:00,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:00:00,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 69 conjunts are in the unsatisfiable core [2022-04-05 06:00:00,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 06:00:00,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:00,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 06:00:04,708 INFO L134 CoverageAnalysis]: Checked inductivity of 4776 backedges. 204 proven. 4556 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:04,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448148458] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 06:00:04,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 06:00:04,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 140 [2022-04-05 06:00:04,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90374499] [2022-04-05 06:00:04,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 06:00:04,710 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2022-04-05 06:00:04,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 06:00:04,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2022-04-05 06:00:04,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9593, Invalid=9867, Unknown=0, NotChecked=0, Total=19460 [2022-04-05 06:00:04,714 INFO L87 Difference]: Start difference. First operand 164 states and 169 transitions. Second operand has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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) [2022-04-05 06:00:10,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 06:00:10,898 INFO L93 Difference]: Finished difference Result 326 states and 405 transitions. [2022-04-05 06:00:10,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2022-04-05 06:00:10,899 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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 155 [2022-04-05 06:00:10,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 06:00:10,901 INFO L225 Difference]: With dead ends: 326 [2022-04-05 06:00:10,902 INFO L226 Difference]: Without dead ends: 302 [2022-04-05 06:00:10,907 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11860 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=28498, Invalid=47402, Unknown=0, NotChecked=0, Total=75900 [2022-04-05 06:00:10,908 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 148 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-05 06:00:10,908 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 59 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-05 06:00:10,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-04-05 06:00:10,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 302. [2022-04-05 06:00:10,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 293 states have (on average 1.0204778156996588) internal successors, (299), 295 states have internal predecessors, (299), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 06:00:10,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 307 transitions. [2022-04-05 06:00:10,928 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 307 transitions. Word has length 155 [2022-04-05 06:00:10,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 06:00:10,929 INFO L478 AbstractCegarLoop]: Abstraction has 302 states and 307 transitions. [2022-04-05 06:00:10,929 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 2.057142857142857) internal successors, (288), 139 states have internal predecessors, (288), 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) [2022-04-05 06:00:10,930 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 307 transitions. [2022-04-05 06:00:10,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2022-04-05 06:00:10,937 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 06:00:10,938 INFO L499 BasicCegarLoop]: trace histogram [138, 136, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 06:00:10,961 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-05 06:00:11,161 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-04-05 06:00:11,161 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 06:00:11,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 06:00:11,162 INFO L85 PathProgramCache]: Analyzing trace with hash 189992452, now seen corresponding path program 8 times [2022-04-05 06:00:11,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 06:00:11,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131442722] [2022-04-05 06:00:11,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 06:00:11,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 06:00:11,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:00:16,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 06:00:16,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:00:16,764 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:16,764 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 06:00:16,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1131442722] [2022-04-05 06:00:16,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1131442722] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 06:00:16,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26928212] [2022-04-05 06:00:16,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-05 06:00:16,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:00:16,765 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 06:00:16,766 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 06:00:16,766 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-05 06:00:16,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-05 06:00:16,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 06:00:16,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 647 conjuncts, 138 conjunts are in the unsatisfiable core [2022-04-05 06:00:16,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 06:00:17,387 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:17,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 06:00:33,754 INFO L134 CoverageAnalysis]: Checked inductivity of 19059 backedges. 411 proven. 18632 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:00:33,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26928212] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 06:00:33,754 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 06:00:33,754 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [140, 139, 139] total 278 [2022-04-05 06:00:33,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217433766] [2022-04-05 06:00:33,754 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 06:00:33,755 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 278 states [2022-04-05 06:00:33,755 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 06:00:33,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 278 interpolants. [2022-04-05 06:00:33,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38228, Invalid=38778, Unknown=0, NotChecked=0, Total=77006 [2022-04-05 06:00:33,764 INFO L87 Difference]: Start difference. First operand 302 states and 307 transitions. Second operand has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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) [2022-04-05 06:00:57,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 06:00:57,249 INFO L93 Difference]: Finished difference Result 602 states and 750 transitions. [2022-04-05 06:00:57,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 277 states. [2022-04-05 06:00:57,250 INFO L78 Accepts]: Start accepts. Automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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 293 [2022-04-05 06:00:57,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 06:00:57,253 INFO L225 Difference]: With dead ends: 602 [2022-04-05 06:00:57,253 INFO L226 Difference]: Without dead ends: 578 [2022-04-05 06:00:57,267 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1000 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 550 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47533 ImplicationChecksByTransitivity, 42.7s TimeCoverageRelationStatistics Valid=114127, Invalid=190025, Unknown=0, NotChecked=0, Total=304152 [2022-04-05 06:00:57,267 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 286 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 421 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1083 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 421 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-04-05 06:00:57,268 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [287 Valid, 64 Invalid, 1083 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [421 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-04-05 06:00:57,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2022-04-05 06:00:57,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 578. [2022-04-05 06:00:57,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 578 states, 569 states have (on average 1.0105448154657293) internal successors, (575), 571 states have internal predecessors, (575), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 06:00:57,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 578 states to 578 states and 583 transitions. [2022-04-05 06:00:57,317 INFO L78 Accepts]: Start accepts. Automaton has 578 states and 583 transitions. Word has length 293 [2022-04-05 06:00:57,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 06:00:57,317 INFO L478 AbstractCegarLoop]: Abstraction has 578 states and 583 transitions. [2022-04-05 06:00:57,317 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 278 states, 278 states have (on average 2.028776978417266) internal successors, (564), 277 states have internal predecessors, (564), 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) [2022-04-05 06:00:57,318 INFO L276 IsEmpty]: Start isEmpty. Operand 578 states and 583 transitions. [2022-04-05 06:00:57,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2022-04-05 06:00:57,323 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 06:00:57,323 INFO L499 BasicCegarLoop]: trace histogram [276, 274, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 06:00:57,342 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-05 06:00:57,542 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:00:57,543 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 06:00:57,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 06:00:57,543 INFO L85 PathProgramCache]: Analyzing trace with hash -1712470692, now seen corresponding path program 9 times [2022-04-05 06:00:57,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 06:00:57,543 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699728033] [2022-04-05 06:00:57,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 06:00:57,543 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 06:00:57,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:01:18,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 06:01:18,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:01:18,637 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 825 proven. 75350 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-05 06:01:18,637 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 06:01:18,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699728033] [2022-04-05 06:01:18,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699728033] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 06:01:18,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839863910] [2022-04-05 06:01:18,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-04-05 06:01:18,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:01:18,638 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 06:01:18,639 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 06:01:18,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-05 06:01:18,706 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-04-05 06:01:18,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 06:01:18,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2022-04-05 06:01:18,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 06:01:20,105 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 826 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-05 06:01:20,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 06:01:21,524 INFO L134 CoverageAnalysis]: Checked inductivity of 76191 backedges. 826 proven. 15 refuted. 0 times theorem prover too weak. 75350 trivial. 0 not checked. [2022-04-05 06:01:21,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [839863910] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 06:01:21,524 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 06:01:21,524 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [278, 9, 9] total 292 [2022-04-05 06:01:21,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627551083] [2022-04-05 06:01:21,524 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 06:01:21,525 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 292 states [2022-04-05 06:01:21,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 06:01:21,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 292 interpolants. [2022-04-05 06:01:21,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38347, Invalid=46625, Unknown=0, NotChecked=0, Total=84972 [2022-04-05 06:01:21,535 INFO L87 Difference]: Start difference. First operand 578 states and 583 transitions. Second operand has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 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) [2022-04-05 06:01:53,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 06:01:53,241 INFO L93 Difference]: Finished difference Result 618 states and 640 transitions. [2022-04-05 06:01:53,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 291 states. [2022-04-05 06:01:53,242 INFO L78 Accepts]: Start accepts. Automaton has has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 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 569 [2022-04-05 06:01:53,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 06:01:53,244 INFO L225 Difference]: With dead ends: 618 [2022-04-05 06:01:53,244 INFO L226 Difference]: Without dead ends: 594 [2022-04-05 06:01:53,258 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1704 GetRequests, 1126 SyntacticMatches, 0 SemanticMatches, 578 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45809 ImplicationChecksByTransitivity, 50.6s TimeCoverageRelationStatistics Valid=121338, Invalid=214482, Unknown=0, NotChecked=0, Total=335820 [2022-04-05 06:01:53,258 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 1676 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 792 mSolverCounterSat, 1419 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1677 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 2211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1419 IncrementalHoareTripleChecker+Valid, 792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-04-05 06:01:53,258 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [1677 Valid, 86 Invalid, 2211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1419 Valid, 792 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-04-05 06:01:53,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2022-04-05 06:01:53,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 588. [2022-04-05 06:01:53,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 588 states, 579 states have (on average 1.0103626943005182) internal successors, (585), 581 states have internal predecessors, (585), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 06:01:53,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 588 states to 588 states and 593 transitions. [2022-04-05 06:01:53,278 INFO L78 Accepts]: Start accepts. Automaton has 588 states and 593 transitions. Word has length 569 [2022-04-05 06:01:53,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 06:01:53,279 INFO L478 AbstractCegarLoop]: Abstraction has 588 states and 593 transitions. [2022-04-05 06:01:53,279 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 292 states, 292 states have (on average 2.0136986301369864) internal successors, (588), 291 states have internal predecessors, (588), 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) [2022-04-05 06:01:53,279 INFO L276 IsEmpty]: Start isEmpty. Operand 588 states and 593 transitions. [2022-04-05 06:01:53,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 580 [2022-04-05 06:01:53,285 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 06:01:53,286 INFO L499 BasicCegarLoop]: trace histogram [277, 275, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 06:01:53,303 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-05 06:01:53,499 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-05 06:01:53,499 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 06:01:53,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 06:01:53,500 INFO L85 PathProgramCache]: Analyzing trace with hash -615378920, now seen corresponding path program 10 times [2022-04-05 06:01:53,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 06:01:53,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998359671] [2022-04-05 06:01:53,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 06:01:53,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 06:01:53,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:02:14,992 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 06:02:14,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:02:15,003 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:02:15,003 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 06:02:15,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998359671] [2022-04-05 06:02:15,003 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998359671] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 06:02:15,003 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668430207] [2022-04-05 06:02:15,004 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-05 06:02:15,004 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:02:15,004 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 06:02:15,004 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 06:02:15,005 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-05 06:02:15,171 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-05 06:02:15,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 06:02:15,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 1259 conjuncts, 277 conjunts are in the unsatisfiable core [2022-04-05 06:02:15,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 06:02:16,062 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:02:16,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 06:03:20,814 INFO L134 CoverageAnalysis]: Checked inductivity of 76820 backedges. 828 proven. 75900 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:03:20,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668430207] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 06:03:20,815 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 06:03:20,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [279, 278, 278] total 556 [2022-04-05 06:03:20,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902628885] [2022-04-05 06:03:20,815 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 06:03:20,817 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 556 states [2022-04-05 06:03:20,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 06:03:20,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 556 interpolants. [2022-04-05 06:03:20,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153737, Invalid=154843, Unknown=0, NotChecked=0, Total=308580 [2022-04-05 06:03:20,904 INFO L87 Difference]: Start difference. First operand 588 states and 593 transitions. Second operand has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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) [2022-04-05 06:04:55,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-05 06:04:55,821 INFO L93 Difference]: Finished difference Result 1174 states and 1461 transitions. [2022-04-05 06:04:55,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 555 states. [2022-04-05 06:04:55,822 INFO L78 Accepts]: Start accepts. Automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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 579 [2022-04-05 06:04:55,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-05 06:04:55,827 INFO L225 Difference]: With dead ends: 1174 [2022-04-05 06:04:55,827 INFO L226 Difference]: Without dead ends: 1142 [2022-04-05 06:04:55,910 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 1989 GetRequests, 883 SyntacticMatches, 0 SemanticMatches, 1106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191676 ImplicationChecksByTransitivity, 170.5s TimeCoverageRelationStatistics Valid=460098, Invalid=766458, Unknown=0, NotChecked=0, Total=1226556 [2022-04-05 06:04:55,911 INFO L913 BasicCegarLoop]: 17 mSDtfsCounter, 564 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1170 mSolverCounterSat, 839 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 2009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 839 IncrementalHoareTripleChecker+Valid, 1170 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-04-05 06:04:55,911 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 44 Invalid, 2009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [839 Valid, 1170 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-04-05 06:04:55,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1142 states. [2022-04-05 06:04:55,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1142 to 1142. [2022-04-05 06:04:55,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1142 states, 1133 states have (on average 1.0052956751985878) internal successors, (1139), 1135 states have internal predecessors, (1139), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-05 06:04:55,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1142 states to 1142 states and 1147 transitions. [2022-04-05 06:04:55,973 INFO L78 Accepts]: Start accepts. Automaton has 1142 states and 1147 transitions. Word has length 579 [2022-04-05 06:04:55,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-05 06:04:55,973 INFO L478 AbstractCegarLoop]: Abstraction has 1142 states and 1147 transitions. [2022-04-05 06:04:55,974 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 556 states, 556 states have (on average 2.014388489208633) internal successors, (1120), 555 states have internal predecessors, (1120), 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) [2022-04-05 06:04:55,974 INFO L276 IsEmpty]: Start isEmpty. Operand 1142 states and 1147 transitions. [2022-04-05 06:04:55,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1134 [2022-04-05 06:04:55,985 INFO L491 BasicCegarLoop]: Found error trace [2022-04-05 06:04:55,986 INFO L499 BasicCegarLoop]: trace histogram [554, 552, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-05 06:04:56,004 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-05 06:04:56,186 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-05 06:04:56,187 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-05 06:04:56,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-05 06:04:56,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1397632252, now seen corresponding path program 11 times [2022-04-05 06:04:56,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-05 06:04:56,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797944864] [2022-04-05 06:04:56,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-05 06:04:56,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-05 06:04:57,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:06:21,633 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-05 06:06:21,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-05 06:06:21,653 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:06:21,653 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-05 06:06:21,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797944864] [2022-04-05 06:06:21,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797944864] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-05 06:06:21,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [951399920] [2022-04-05 06:06:21,654 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-04-05 06:06:21,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-05 06:06:21,654 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-05 06:06:21,655 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-05 06:06:21,655 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-05 06:06:23,360 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 555 check-sat command(s) [2022-04-05 06:06:23,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-05 06:06:23,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 2367 conjuncts, 554 conjunts are in the unsatisfiable core [2022-04-05 06:06:23,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-05 06:06:25,032 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:06:25,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-05 06:10:42,489 INFO L134 CoverageAnalysis]: Checked inductivity of 307007 backedges. 1659 proven. 305256 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2022-04-05 06:10:42,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [951399920] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-05 06:10:42,490 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-05 06:10:42,490 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [556, 555, 555] total 1110 [2022-04-05 06:10:42,490 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1557195587] [2022-04-05 06:10:42,491 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-04-05 06:10:42,493 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 1110 states [2022-04-05 06:10:42,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-04-05 06:10:42,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 1110 interpolants. [2022-04-05 06:10:42,640 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=614388, Invalid=616602, Unknown=0, NotChecked=0, Total=1230990 [2022-04-05 06:10:42,642 INFO L87 Difference]: Start difference. First operand 1142 states and 1147 transitions. Second operand has 1110 states, 1110 states have (on average 2.007207207207207) internal successors, (2228), 1109 states have internal predecessors, (2228), 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)