/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 07:53:31,390 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 07:53:31,392 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 07:53:31,427 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 07:53:31,452 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 07:53:31,454 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 07:53:31,455 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 07:53:31,456 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 07:53:31,456 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 07:53:31,457 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 07:53:31,458 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 07:53:31,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 07:53:31,461 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 07:53:31,463 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 07:53:31,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 07:53:31,464 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 07:53:31,466 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 07:53:31,472 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 07:53:31,473 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 07:53:31,474 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 07:53:31,475 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-01-31 07:53:31,482 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 07:53:31,482 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 07:53:31,484 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 07:53:31,484 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 07:53:31,484 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 07:53:31,484 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 07:53:31,484 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 07:53:31,485 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 07:53:31,486 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 07:53:31,486 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 07:53:31,486 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 07:53:31,486 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 07:53:31,486 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 07:53:31,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 07:53:31,487 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 07:53:31,487 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-31 07:53:31,488 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-01-31 07:53:31,488 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 07:53:31,709 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 07:53:31,730 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 07:53:31,732 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 07:53:31,734 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 07:53:31,734 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 07:53:31,735 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2022-01-31 07:53:31,791 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc84880ff/574bd86548424d889af9bdd6c8f8c749/FLAG8e5a36fa4 [2022-01-31 07:53:32,150 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 07:53:32,151 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2022-01-31 07:53:32,156 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc84880ff/574bd86548424d889af9bdd6c8f8c749/FLAG8e5a36fa4 [2022-01-31 07:53:32,581 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dc84880ff/574bd86548424d889af9bdd6c8f8c749 [2022-01-31 07:53:32,584 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 07:53:32,585 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-31 07:53:32,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 07:53:32,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 07:53:32,593 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 07:53:32,593 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,594 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71363d6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32, skipping insertion in model container [2022-01-31 07:53:32,594 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,598 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 07:53:32,610 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 07:53:32,719 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i[819,832] [2022-01-31 07:53:32,741 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 07:53:32,747 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 07:53:32,757 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i[819,832] [2022-01-31 07:53:32,762 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 07:53:32,773 INFO L208 MainTranslator]: Completed translation [2022-01-31 07:53:32,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32 WrapperNode [2022-01-31 07:53:32,774 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 07:53:32,776 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 07:53:32,776 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 07:53:32,776 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 07:53:32,792 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,793 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,798 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,799 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,804 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,807 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,810 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 07:53:32,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 07:53:32,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 07:53:32,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 07:53:32,816 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (1/1) ... [2022-01-31 07:53:32,830 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 07:53:32,839 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:32,848 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) [2022-01-31 07:53:32,850 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 [2022-01-31 07:53:32,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 07:53:32,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 07:53:32,875 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 07:53:32,875 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 07:53:32,875 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 07:53:32,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 07:53:32,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 07:53:32,938 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 07:53:32,940 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 07:53:33,052 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 07:53:33,058 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 07:53:33,058 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-01-31 07:53:33,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 07:53:33 BoogieIcfgContainer [2022-01-31 07:53:33,060 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 07:53:33,060 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-01-31 07:53:33,061 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-01-31 07:53:33,062 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-01-31 07:53:33,064 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 07:53:33" (1/1) ... [2022-01-31 07:53:33,080 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 07:53:33 BasicIcfg [2022-01-31 07:53:33,080 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-01-31 07:53:33,082 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 07:53:33,083 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 07:53:33,085 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 07:53:33,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 07:53:32" (1/4) ... [2022-01-31 07:53:33,086 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@205b7d2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 07:53:33, skipping insertion in model container [2022-01-31 07:53:33,086 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 07:53:32" (2/4) ... [2022-01-31 07:53:33,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@205b7d2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 07:53:33, skipping insertion in model container [2022-01-31 07:53:33,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 07:53:33" (3/4) ... [2022-01-31 07:53:33,087 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@205b7d2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 07:53:33, skipping insertion in model container [2022-01-31 07:53:33,087 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 07:53:33" (4/4) ... [2022-01-31 07:53:33,088 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.iJordan [2022-01-31 07:53:33,093 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-01-31 07:53:33,094 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 07:53:33,139 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 07:53:33,145 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-31 07:53:33,145 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 07:53:33,208 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-31 07:53:33,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 07:53:33,215 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:33,216 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:33,216 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:33,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:33,221 INFO L85 PathProgramCache]: Analyzing trace with hash -839270659, now seen corresponding path program 1 times [2022-01-31 07:53:33,232 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:33,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845456064] [2022-01-31 07:53:33,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:33,236 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:33,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:33,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 07:53:33,462 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:33,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845456064] [2022-01-31 07:53:33,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845456064] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 07:53:33,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 07:53:33,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 07:53:33,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138251370] [2022-01-31 07:53:33,465 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 07:53:33,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 07:53:33,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:33,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 07:53:33,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 07:53:33,502 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 07:53:33,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:33,554 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2022-01-31 07:53:33,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 07:53:33,557 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, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-01-31 07:53:33,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:33,565 INFO L225 Difference]: With dead ends: 27 [2022-01-31 07:53:33,566 INFO L226 Difference]: Without dead ends: 22 [2022-01-31 07:53:33,570 INFO L932 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 [2022-01-31 07:53:33,576 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:33,577 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 07:53:33,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-01-31 07:53:33,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-01-31 07:53:33,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:33,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-01-31 07:53:33,609 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2022-01-31 07:53:33,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:33,610 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-01-31 07:53:33,610 INFO L471 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, (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) [2022-01-31 07:53:33,610 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-01-31 07:53:33,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 07:53:33,611 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:33,612 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:33,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 07:53:33,612 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:33,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:33,615 INFO L85 PathProgramCache]: Analyzing trace with hash -1759221441, now seen corresponding path program 1 times [2022-01-31 07:53:33,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:33,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734912529] [2022-01-31 07:53:33,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:33,617 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:33,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:33,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 07:53:33,674 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:33,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734912529] [2022-01-31 07:53:33,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734912529] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 07:53:33,675 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 07:53:33,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 07:53:33,676 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71298732] [2022-01-31 07:53:33,676 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 07:53:33,677 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 07:53:33,677 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:33,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 07:53:33,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 07:53:33,678 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 07:53:33,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:33,739 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-01-31 07:53:33,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 07:53:33,739 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-01-31 07:53:33,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:33,741 INFO L225 Difference]: With dead ends: 26 [2022-01-31 07:53:33,741 INFO L226 Difference]: Without dead ends: 26 [2022-01-31 07:53:33,746 INFO L932 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 [2022-01-31 07:53:33,747 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:33,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 26 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 07:53:33,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-01-31 07:53:33,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-01-31 07:53:33,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:33,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-01-31 07:53:33,759 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2022-01-31 07:53:33,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:33,759 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-01-31 07:53:33,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 07:53:33,761 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-01-31 07:53:33,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-31 07:53:33,764 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:33,767 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:33,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 07:53:33,768 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:33,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:33,768 INFO L85 PathProgramCache]: Analyzing trace with hash 852859995, now seen corresponding path program 1 times [2022-01-31 07:53:33,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:33,769 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336131074] [2022-01-31 07:53:33,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:33,769 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:33,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:33,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-31 07:53:33,860 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:33,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336131074] [2022-01-31 07:53:33,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336131074] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:53:33,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1239171346] [2022-01-31 07:53:33,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:33,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:33,861 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:33,880 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) [2022-01-31 07:53:33,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-31 07:53:33,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:33,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-31 07:53:33,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 07:53:34,055 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-31 07:53:34,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 07:53:34,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-31 07:53:34,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1239171346] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 07:53:34,113 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 07:53:34,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-01-31 07:53:34,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004886974] [2022-01-31 07:53:34,113 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 07:53:34,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 07:53:34,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:34,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 07:53:34,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-01-31 07:53:34,115 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 07:53:34,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:34,242 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2022-01-31 07:53:34,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 07:53:34,243 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-01-31 07:53:34,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:34,245 INFO L225 Difference]: With dead ends: 39 [2022-01-31 07:53:34,246 INFO L226 Difference]: Without dead ends: 39 [2022-01-31 07:53:34,247 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-01-31 07:53:34,249 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 56 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:34,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 30 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 07:53:34,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-31 07:53:34,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2022-01-31 07:53:34,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:34,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-01-31 07:53:34,257 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 19 [2022-01-31 07:53:34,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:34,257 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-01-31 07:53:34,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 07:53:34,257 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-01-31 07:53:34,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-31 07:53:34,258 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:34,258 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:34,280 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-01-31 07:53:34,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:34,465 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:34,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:34,466 INFO L85 PathProgramCache]: Analyzing trace with hash -1363317453, now seen corresponding path program 2 times [2022-01-31 07:53:34,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:34,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346355027] [2022-01-31 07:53:34,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:34,467 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:34,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:34,556 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:34,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:34,582 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-01-31 07:53:34,582 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:34,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346355027] [2022-01-31 07:53:34,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346355027] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:53:34,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219950945] [2022-01-31 07:53:34,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-31 07:53:34,583 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:34,583 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:34,585 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) [2022-01-31 07:53:34,586 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-31 07:53:34,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-31 07:53:34,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 07:53:34,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-31 07:53:34,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 07:53:34,740 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-31 07:53:34,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 07:53:34,832 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-31 07:53:34,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219950945] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 07:53:34,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 07:53:34,835 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 12 [2022-01-31 07:53:34,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578819959] [2022-01-31 07:53:34,837 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 07:53:34,838 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 07:53:34,841 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:34,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 07:53:34,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2022-01-31 07:53:34,843 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 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) [2022-01-31 07:53:35,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:35,029 INFO L93 Difference]: Finished difference Result 53 states and 55 transitions. [2022-01-31 07:53:35,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-31 07:53:35,030 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 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 27 [2022-01-31 07:53:35,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:35,033 INFO L225 Difference]: With dead ends: 53 [2022-01-31 07:53:35,033 INFO L226 Difference]: Without dead ends: 53 [2022-01-31 07:53:35,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2022-01-31 07:53:35,036 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:35,037 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 31 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 07:53:35,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-01-31 07:53:35,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-01-31 07:53:35,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:35,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-01-31 07:53:35,054 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 27 [2022-01-31 07:53:35,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:35,054 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-01-31 07:53:35,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 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) [2022-01-31 07:53:35,055 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-01-31 07:53:35,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 07:53:35,056 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:35,056 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:35,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-01-31 07:53:35,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-01-31 07:53:35,280 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:35,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:35,281 INFO L85 PathProgramCache]: Analyzing trace with hash -935749089, now seen corresponding path program 3 times [2022-01-31 07:53:35,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:35,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472123199] [2022-01-31 07:53:35,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:35,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:35,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:35,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:35,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:35,470 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-31 07:53:35,470 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:35,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472123199] [2022-01-31 07:53:35,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472123199] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:53:35,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853953063] [2022-01-31 07:53:35,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-31 07:53:35,471 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:35,471 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:35,472 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) [2022-01-31 07:53:35,473 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-01-31 07:53:35,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-01-31 07:53:35,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 07:53:35,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 10 conjunts are in the unsatisfiable core [2022-01-31 07:53:35,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 07:53:35,745 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-31 07:53:35,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 07:53:35,963 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-31 07:53:35,964 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853953063] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 07:53:35,964 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 07:53:35,964 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-01-31 07:53:35,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985882255] [2022-01-31 07:53:35,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 07:53:35,967 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 07:53:35,967 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:35,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 07:53:35,968 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2022-01-31 07:53:35,968 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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) [2022-01-31 07:53:36,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:36,358 INFO L93 Difference]: Finished difference Result 81 states and 85 transitions. [2022-01-31 07:53:36,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 07:53:36,359 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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 47 [2022-01-31 07:53:36,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:36,361 INFO L225 Difference]: With dead ends: 81 [2022-01-31 07:53:36,361 INFO L226 Difference]: Without dead ends: 81 [2022-01-31 07:53:36,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=591, Invalid=969, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 07:53:36,363 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 130 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:36,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 40 Invalid, 209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 07:53:36,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-31 07:53:36,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-01-31 07:53:36,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:36,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2022-01-31 07:53:36,372 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 47 [2022-01-31 07:53:36,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:36,372 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2022-01-31 07:53:36,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 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) [2022-01-31 07:53:36,373 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2022-01-31 07:53:36,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-01-31 07:53:36,375 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:36,375 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:36,407 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-01-31 07:53:36,599 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:36,600 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:36,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:36,600 INFO L85 PathProgramCache]: Analyzing trace with hash -884847415, now seen corresponding path program 4 times [2022-01-31 07:53:36,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:36,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206115404] [2022-01-31 07:53:36,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:36,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:36,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:36,931 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:36,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:36,938 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-31 07:53:36,938 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:36,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206115404] [2022-01-31 07:53:36,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206115404] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:53:36,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752984172] [2022-01-31 07:53:36,938 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-31 07:53:36,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:36,939 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:36,944 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) [2022-01-31 07:53:36,946 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-01-31 07:53:37,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-31 07:53:37,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 07:53:37,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 20 conjunts are in the unsatisfiable core [2022-01-31 07:53:37,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 07:53:37,181 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-31 07:53:37,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 07:53:37,765 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-31 07:53:37,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752984172] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 07:53:37,765 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 07:53:37,765 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-01-31 07:53:37,766 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120560281] [2022-01-31 07:53:37,766 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 07:53:37,766 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 07:53:37,766 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:53:37,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 07:53:37,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 07:53:37,769 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 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) [2022-01-31 07:53:38,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:53:38,714 INFO L93 Difference]: Finished difference Result 141 states and 145 transitions. [2022-01-31 07:53:38,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 07:53:38,714 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 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 69 [2022-01-31 07:53:38,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:53:38,716 INFO L225 Difference]: With dead ends: 141 [2022-01-31 07:53:38,716 INFO L226 Difference]: Without dead ends: 141 [2022-01-31 07:53:38,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2381, Invalid=3939, Unknown=0, NotChecked=0, Total=6320 [2022-01-31 07:53:38,719 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 220 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 07:53:38,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [220 Valid, 40 Invalid, 340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 07:53:38,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-01-31 07:53:38,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 134. [2022-01-31 07:53:38,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:53:38,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2022-01-31 07:53:38,726 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 69 [2022-01-31 07:53:38,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:53:38,726 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2022-01-31 07:53:38,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 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) [2022-01-31 07:53:38,727 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2022-01-31 07:53:38,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-01-31 07:53:38,728 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:53:38,728 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:53:38,756 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-01-31 07:53:38,943 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:38,943 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:53:38,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:53:38,944 INFO L85 PathProgramCache]: Analyzing trace with hash 1847966093, now seen corresponding path program 5 times [2022-01-31 07:53:38,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:53:38,944 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [297615686] [2022-01-31 07:53:38,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:53:38,944 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:53:39,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:39,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:53:39,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:53:39,751 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-31 07:53:39,752 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:53:39,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [297615686] [2022-01-31 07:53:39,752 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [297615686] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:53:39,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482691601] [2022-01-31 07:53:39,752 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-31 07:53:39,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:53:39,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:53:39,756 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) [2022-01-31 07:53:39,758 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-01-31 07:58:07,080 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 39 check-sat command(s) [2022-01-31 07:58:07,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 07:58:07,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 40 conjunts are in the unsatisfiable core [2022-01-31 07:58:07,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 07:58:07,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-31 07:58:07,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 07:58:09,314 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-31 07:58:09,314 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482691601] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 07:58:09,314 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 07:58:09,314 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2022-01-31 07:58:09,315 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20721119] [2022-01-31 07:58:09,315 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 07:58:09,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-01-31 07:58:09,315 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 07:58:09,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-01-31 07:58:09,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3242, Invalid=3400, Unknown=0, NotChecked=0, Total=6642 [2022-01-31 07:58:09,320 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 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) [2022-01-31 07:58:12,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 07:58:12,002 INFO L93 Difference]: Finished difference Result 261 states and 265 transitions. [2022-01-31 07:58:12,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-01-31 07:58:12,002 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 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 129 [2022-01-31 07:58:12,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 07:58:12,003 INFO L225 Difference]: With dead ends: 261 [2022-01-31 07:58:12,004 INFO L226 Difference]: Without dead ends: 261 [2022-01-31 07:58:12,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3972 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=9561, Invalid=15879, Unknown=0, NotChecked=0, Total=25440 [2022-01-31 07:58:12,008 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 503 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 294 mSolverCounterSat, 434 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 503 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 728 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 434 IncrementalHoareTripleChecker+Valid, 294 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 07:58:12,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [503 Valid, 30 Invalid, 728 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [434 Valid, 294 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 07:58:12,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-01-31 07:58:12,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 254. [2022-01-31 07:58:12,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-31 07:58:12,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 256 transitions. [2022-01-31 07:58:12,023 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 256 transitions. Word has length 129 [2022-01-31 07:58:12,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 07:58:12,023 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 256 transitions. [2022-01-31 07:58:12,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 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) [2022-01-31 07:58:12,024 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 256 transitions. [2022-01-31 07:58:12,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2022-01-31 07:58:12,027 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 07:58:12,027 INFO L514 BasicCegarLoop]: trace histogram [78, 78, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 07:58:12,100 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-01-31 07:58:12,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:58:12,236 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 07:58:12,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 07:58:12,237 INFO L85 PathProgramCache]: Analyzing trace with hash -340625131, now seen corresponding path program 6 times [2022-01-31 07:58:12,237 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 07:58:12,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130065190] [2022-01-31 07:58:12,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 07:58:12,237 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 07:58:12,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:58:14,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 07:58:14,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 07:58:14,568 INFO L134 CoverageAnalysis]: Checked inductivity of 7605 backedges. 0 proven. 6084 refuted. 0 times theorem prover too weak. 1521 trivial. 0 not checked. [2022-01-31 07:58:14,568 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 07:58:14,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130065190] [2022-01-31 07:58:14,569 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130065190] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 07:58:14,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668375375] [2022-01-31 07:58:14,569 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-31 07:58:14,569 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 07:58:14,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 07:58:14,572 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) [2022-01-31 07:58:14,598 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process