/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 01:41:27,007 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 01:41:27,009 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 01:41:27,052 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 01:41:27,070 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 01:41:27,071 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 01:41:27,072 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 01:41:27,073 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 01:41:27,074 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 01:41:27,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 01:41:27,078 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 01:41:27,083 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 01:41:27,084 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 01:41:27,085 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 01:41:27,086 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 01:41:27,087 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 01:41:27,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 01:41:27,094 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-20 01:41:27,101 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 01:41:27,102 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 01:41:27,103 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 01:41:27,104 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-03-20 01:41:27,124 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 01:41:27,124 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 01:41:27,125 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-03-20 01:41:27,125 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-03-20 01:41:27,126 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-03-20 01:41:27,127 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-03-20 01:41:27,127 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-03-20 01:41:27,127 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-03-20 01:41:27,127 INFO L138 SettingsManager]: * Use SBE=true [2022-03-20 01:41:27,128 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 01:41:27,128 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 01:41:27,128 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 01:41:27,129 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 01:41:27,130 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 01:41:27,130 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 01:41:27,130 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 01:41:27,130 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 01:41:27,130 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 01:41:27,130 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-03-20 01:41:27,131 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 01:41:27,132 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 01:41:27,351 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 01:41:27,367 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 01:41:27,369 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 01:41:27,370 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 01:41:27,371 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 01:41:27,372 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound20.c [2022-03-20 01:41:27,431 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b67af7f6/27ca032121054ecaa8b7cd9e64fe0af0/FLAG3129d4620 [2022-03-20 01:41:27,835 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 01:41:27,836 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound20.c [2022-03-20 01:41:27,841 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b67af7f6/27ca032121054ecaa8b7cd9e64fe0af0/FLAG3129d4620 [2022-03-20 01:41:27,852 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2b67af7f6/27ca032121054ecaa8b7cd9e64fe0af0 [2022-03-20 01:41:27,854 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 01:41:27,856 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 01:41:27,859 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 01:41:27,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 01:41:27,862 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 01:41:27,863 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:41:27" (1/1) ... [2022-03-20 01:41:27,864 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ad26e78 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:27, skipping insertion in model container [2022-03-20 01:41:27,864 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:41:27" (1/1) ... [2022-03-20 01:41:27,869 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 01:41:27,882 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 01:41:28,015 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound20.c[537,550] [2022-03-20 01:41:28,028 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 01:41:28,035 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 01:41:28,044 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound20.c[537,550] [2022-03-20 01:41:28,049 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 01:41:28,060 INFO L208 MainTranslator]: Completed translation [2022-03-20 01:41:28,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28 WrapperNode [2022-03-20 01:41:28,061 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 01:41:28,062 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 01:41:28,062 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 01:41:28,062 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 01:41:28,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,069 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,074 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,074 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,077 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,081 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,082 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 01:41:28,083 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 01:41:28,083 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 01:41:28,083 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 01:41:28,084 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (1/1) ... [2022-03-20 01:41:28,089 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 01:41:28,099 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 01:41:28,116 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 01:41:28,127 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 01:41:28,148 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 01:41:28,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 01:41:28,149 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 01:41:28,150 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-03-20 01:41:28,152 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 01:41:28,152 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 01:41:28,152 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 01:41:28,152 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 01:41:28,153 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 01:41:28,153 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 01:41:28,153 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 01:41:28,153 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-03-20 01:41:28,156 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 01:41:28,157 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 01:41:28,206 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 01:41:28,207 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 01:41:28,315 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 01:41:28,320 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 01:41:28,320 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-20 01:41:28,321 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:41:28 BoogieIcfgContainer [2022-03-20 01:41:28,322 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 01:41:28,323 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 01:41:28,323 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 01:41:28,338 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 01:41:28,338 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 01:41:27" (1/3) ... [2022-03-20 01:41:28,339 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@660ea512 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:41:28, skipping insertion in model container [2022-03-20 01:41:28,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:41:28" (2/3) ... [2022-03-20 01:41:28,339 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@660ea512 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:41:28, skipping insertion in model container [2022-03-20 01:41:28,339 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:41:28" (3/3) ... [2022-03-20 01:41:28,340 INFO L111 eAbstractionObserver]: Analyzing ICFG lcm2_unwindbound20.c [2022-03-20 01:41:28,344 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-03-20 01:41:28,345 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 01:41:28,425 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 01:41:28,437 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=PETRI_NET, 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 [2022-03-20 01:41:28,437 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 01:41:28,464 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2022-03-20 01:41:28,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-20 01:41:28,468 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 01:41:28,468 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 01:41:28,469 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 01:41:28,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 01:41:28,480 INFO L85 PathProgramCache]: Analyzing trace with hash 2009995470, now seen corresponding path program 1 times [2022-03-20 01:41:28,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 01:41:28,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849267623] [2022-03-20 01:41:28,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:28,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 01:41:28,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 01:41:28,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,695 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 01:41:28,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 01:41:28,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 01:41:28,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-20 01:41:28,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:28,731 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 01:41:28,732 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 01:41:28,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849267623] [2022-03-20 01:41:28,733 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1849267623] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 01:41:28,734 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 01:41:28,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-20 01:41:28,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433547664] [2022-03-20 01:41:28,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 01:41:28,740 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-20 01:41:28,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-20 01:41:28,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-20 01:41:28,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 01:41:28,772 INFO L87 Difference]: Start difference. First operand has 32 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 01:41:28,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 01:41:28,871 INFO L93 Difference]: Finished difference Result 58 states and 82 transitions. [2022-03-20 01:41:28,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-20 01:41:28,874 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2022-03-20 01:41:28,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 01:41:28,885 INFO L225 Difference]: With dead ends: 58 [2022-03-20 01:41:28,886 INFO L226 Difference]: Without dead ends: 28 [2022-03-20 01:41:28,892 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-20 01:41:28,895 INFO L913 BasicCegarLoop]: 33 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 01:41:28,896 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 37 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 01:41:28,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-20 01:41:28,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-03-20 01:41:28,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 01:41:28,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-03-20 01:41:28,939 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 32 [2022-03-20 01:41:28,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 01:41:28,939 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-03-20 01:41:28,940 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 01:41:28,940 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-03-20 01:41:28,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 01:41:28,943 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 01:41:28,943 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 01:41:28,943 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 01:41:28,945 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 01:41:28,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 01:41:28,946 INFO L85 PathProgramCache]: Analyzing trace with hash -756409738, now seen corresponding path program 1 times [2022-03-20 01:41:28,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 01:41:28,946 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634778038] [2022-03-20 01:41:28,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:28,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 01:41:28,988 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 01:41:28,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1485069700] [2022-03-20 01:41:28,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:28,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:28,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 01:41:28,993 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 01:41:28,994 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 01:41:29,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:29,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 5 conjunts are in the unsatisfiable core [2022-03-20 01:41:29,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 01:41:29,202 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 01:41:29,202 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 01:41:29,203 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 01:41:29,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634778038] [2022-03-20 01:41:29,203 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 01:41:29,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485069700] [2022-03-20 01:41:29,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485069700] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 01:41:29,203 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 01:41:29,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 01:41:29,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847934786] [2022-03-20 01:41:29,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 01:41:29,205 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 01:41:29,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-20 01:41:29,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 01:41:29,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 01:41:29,206 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 01:41:29,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 01:41:29,222 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2022-03-20 01:41:29,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 01:41:29,223 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2022-03-20 01:41:29,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 01:41:29,224 INFO L225 Difference]: With dead ends: 36 [2022-03-20 01:41:29,224 INFO L226 Difference]: Without dead ends: 29 [2022-03-20 01:41:29,225 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 01:41:29,226 INFO L913 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 01:41:29,226 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 75 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 01:41:29,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-20 01:41:29,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-20 01:41:29,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-03-20 01:41:29,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-03-20 01:41:29,233 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 33 [2022-03-20 01:41:29,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 01:41:29,234 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-03-20 01:41:29,234 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2022-03-20 01:41:29,234 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-03-20 01:41:29,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 01:41:29,235 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 01:41:29,235 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 01:41:29,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 01:41:29,455 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:29,456 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 01:41:29,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 01:41:29,456 INFO L85 PathProgramCache]: Analyzing trace with hash -754622278, now seen corresponding path program 1 times [2022-03-20 01:41:29,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 01:41:29,457 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647659796] [2022-03-20 01:41:29,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:29,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 01:41:29,477 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 01:41:29,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1022694090] [2022-03-20 01:41:29,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:29,477 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:29,478 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 01:41:29,481 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 01:41:29,483 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 01:41:29,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:29,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 32 conjunts are in the unsatisfiable core [2022-03-20 01:41:29,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 01:41:29,893 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 01:41:29,893 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 01:41:29,893 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 01:41:29,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647659796] [2022-03-20 01:41:29,894 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 01:41:29,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022694090] [2022-03-20 01:41:29,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022694090] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 01:41:29,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 01:41:29,896 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-20 01:41:29,896 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452393336] [2022-03-20 01:41:29,896 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 01:41:29,897 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-20 01:41:29,897 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-20 01:41:29,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-20 01:41:29,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-03-20 01:41:29,898 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-03-20 01:41:29,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 01:41:29,977 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2022-03-20 01:41:29,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-20 01:41:29,980 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 33 [2022-03-20 01:41:29,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 01:41:29,981 INFO L225 Difference]: With dead ends: 39 [2022-03-20 01:41:29,981 INFO L226 Difference]: Without dead ends: 36 [2022-03-20 01:41:29,982 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-03-20 01:41:29,983 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 7 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 01:41:29,983 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 104 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 01:41:29,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-20 01:41:29,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2022-03-20 01:41:29,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2022-03-20 01:41:29,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2022-03-20 01:41:29,990 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 33 [2022-03-20 01:41:29,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 01:41:29,991 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2022-03-20 01:41:29,991 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2022-03-20 01:41:29,991 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2022-03-20 01:41:29,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 01:41:29,992 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 01:41:29,992 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 01:41:30,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 01:41:30,214 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2022-03-20 01:41:30,215 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 01:41:30,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 01:41:30,215 INFO L85 PathProgramCache]: Analyzing trace with hash 756635198, now seen corresponding path program 1 times [2022-03-20 01:41:30,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 01:41:30,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094360234] [2022-03-20 01:41:30,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:30,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 01:41:30,229 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 01:41:30,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [151491873] [2022-03-20 01:41:30,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:30,230 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:30,230 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 01:41:30,231 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 01:41:30,232 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 01:41:30,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 01:41:30,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-20 01:41:30,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 01:41:30,396 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 01:41:30,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 01:41:30,535 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-03-20 01:41:30,535 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 01:41:30,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094360234] [2022-03-20 01:41:30,536 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2022-03-20 01:41:30,536 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151491873] [2022-03-20 01:41:30,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151491873] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 01:41:30,536 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-03-20 01:41:30,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2022-03-20 01:41:30,537 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522546334] [2022-03-20 01:41:30,537 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-03-20 01:41:30,537 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-20 01:41:30,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-03-20 01:41:30,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-20 01:41:30,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2022-03-20 01:41:30,539 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2022-03-20 01:41:30,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 01:41:30,607 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2022-03-20 01:41:30,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-20 01:41:30,607 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 42 [2022-03-20 01:41:30,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 01:41:30,609 INFO L225 Difference]: With dead ends: 69 [2022-03-20 01:41:30,609 INFO L226 Difference]: Without dead ends: 62 [2022-03-20 01:41:30,609 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2022-03-20 01:41:30,610 INFO L913 BasicCegarLoop]: 34 mSDtfsCounter, 40 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 01:41:30,610 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 144 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 01:41:30,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-20 01:41:30,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 58. [2022-03-20 01:41:30,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 41 states have internal predecessors, (49), 13 states have call successors, (13), 7 states have call predecessors, (13), 6 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-03-20 01:41:30,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 71 transitions. [2022-03-20 01:41:30,619 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 71 transitions. Word has length 42 [2022-03-20 01:41:30,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 01:41:30,619 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 71 transitions. [2022-03-20 01:41:30,619 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.375) internal successors, (35), 8 states have internal predecessors, (35), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2022-03-20 01:41:30,620 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 71 transitions. [2022-03-20 01:41:30,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-20 01:41:30,620 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 01:41:30,621 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 01:41:30,650 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 01:41:30,847 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:30,848 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 01:41:30,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 01:41:30,848 INFO L85 PathProgramCache]: Analyzing trace with hash 758422658, now seen corresponding path program 1 times [2022-03-20 01:41:30,848 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 01:41:30,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274499316] [2022-03-20 01:41:30,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:30,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 01:41:30,863 ERROR L245 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2022-03-20 01:41:30,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1021882808] [2022-03-20 01:41:30,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 01:41:30,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 01:41:30,864 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 01:41:30,866 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 01:41:30,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process