/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/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 12:18:14,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 12:18:14,315 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 12:18:14,359 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 12:18:14,378 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-01-31 12:18:14,380 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-01-31 12:18:14,381 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-01-31 12:18:14,383 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-01-31 12:18:14,383 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-01-31 12:18:14,384 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-01-31 12:18:14,385 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-01-31 12:18:14,390 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-01-31 12:18:14,391 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-01-31 12:18:14,391 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-01-31 12:18:14,392 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-01-31 12:18:14,393 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-01-31 12:18:14,398 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-01-31 12:18:14,404 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 12:18:14,405 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 12:18:14,405 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 12:18:14,406 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2022-01-31 12:18:14,417 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 12:18:14,418 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 12:18:14,419 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 12:18:14,419 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 12:18:14,419 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 12:18:14,419 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 12:18:14,419 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 12:18:14,419 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 12:18:14,420 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 12:18:14,420 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 12:18:14,420 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 12:18:14,420 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 12:18:14,421 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 12:18:14,421 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 12:18:14,421 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-31 12:18:14,422 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2022-01-31 12:18:14,422 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 12:18:14,652 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 12:18:14,679 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 12:18:14,681 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 12:18:14,682 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 12:18:14,684 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 12:18:14,686 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-01-31 12:18:14,746 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faab397ab/107853218cef412c8960af75ade94d5f/FLAG5278b7d7c [2022-01-31 12:18:15,182 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 12:18:15,183 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2022-01-31 12:18:15,194 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faab397ab/107853218cef412c8960af75ade94d5f/FLAG5278b7d7c [2022-01-31 12:18:15,571 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/faab397ab/107853218cef412c8960af75ade94d5f [2022-01-31 12:18:15,573 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 12:18:15,574 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-31 12:18:15,576 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 12:18:15,576 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 12:18:15,579 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 12:18:15,580 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,581 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27b7cdf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15, skipping insertion in model container [2022-01-31 12:18:15,581 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,587 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 12:18:15,599 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 12:18:15,762 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-01-31 12:18:15,794 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 12:18:15,800 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 12:18:15,810 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i[809,822] [2022-01-31 12:18:15,813 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 12:18:15,824 INFO L208 MainTranslator]: Completed translation [2022-01-31 12:18:15,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15 WrapperNode [2022-01-31 12:18:15,825 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 12:18:15,826 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 12:18:15,826 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 12:18:15,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 12:18:15,835 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,836 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,841 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,842 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,846 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,851 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,852 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 12:18:15,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 12:18:15,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 12:18:15,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 12:18:15,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (1/1) ... [2022-01-31 12:18:15,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 12:18:15,870 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:15,897 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 12:18:15,906 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 12:18:15,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 12:18:15,936 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 12:18:15,936 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 12:18:15,936 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 12:18:15,936 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 12:18:15,936 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 12:18:15,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 12:18:15,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 12:18:15,990 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 12:18:15,992 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 12:18:16,133 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 12:18:16,137 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 12:18:16,138 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-31 12:18:16,160 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 12:18:16 BoogieIcfgContainer [2022-01-31 12:18:16,160 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 12:18:16,161 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2022-01-31 12:18:16,161 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2022-01-31 12:18:16,162 INFO L275 PluginConnector]: IcfgTransformer initialized [2022-01-31 12:18:16,164 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 12:18:16" (1/1) ... [2022-01-31 12:18:16,190 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 12:18:16 BasicIcfg [2022-01-31 12:18:16,190 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2022-01-31 12:18:16,191 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 12:18:16,191 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 12:18:16,194 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 12:18:16,194 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 12:18:15" (1/4) ... [2022-01-31 12:18:16,194 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cc8709b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 12:18:16, skipping insertion in model container [2022-01-31 12:18:16,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 12:18:15" (2/4) ... [2022-01-31 12:18:16,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cc8709b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 12:18:16, skipping insertion in model container [2022-01-31 12:18:16,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 12:18:16" (3/4) ... [2022-01-31 12:18:16,195 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5cc8709b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 12:18:16, skipping insertion in model container [2022-01-31 12:18:16,195 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 31.01 12:18:16" (4/4) ... [2022-01-31 12:18:16,196 INFO L111 eAbstractionObserver]: Analyzing ICFG array_3-2.iJordan [2022-01-31 12:18:16,199 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2022-01-31 12:18:16,200 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 12:18:16,229 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 12:18:16,234 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 12:18:16,234 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 12:18:16,243 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 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 12:18:16,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 12:18:16,248 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:16,249 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:16,249 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:16,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:16,253 INFO L85 PathProgramCache]: Analyzing trace with hash -1043605578, now seen corresponding path program 1 times [2022-01-31 12:18:16,259 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:16,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033512538] [2022-01-31 12:18:16,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:16,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:16,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:16,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,468 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 12:18:16,469 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:16,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033512538] [2022-01-31 12:18:16,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033512538] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 12:18:16,472 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 12:18:16,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 12:18:16,474 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738025464] [2022-01-31 12:18:16,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 12:18:16,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 12:18:16,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:16,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 12:18:16,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 12:18:16,515 INFO L87 Difference]: Start difference. First operand has 25 states, 17 states have (on average 1.411764705882353) internal successors, (24), 18 states have internal predecessors, (24), 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 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 12:18:16,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:16,560 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2022-01-31 12:18:16,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 12:18:16,566 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 13 [2022-01-31 12:18:16,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:16,572 INFO L225 Difference]: With dead ends: 25 [2022-01-31 12:18:16,572 INFO L226 Difference]: Without dead ends: 18 [2022-01-31 12:18:16,573 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 12:18:16,578 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 18 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 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 12:18:16,579 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 12:18:16,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-01-31 12:18:16,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-01-31 12:18:16,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:16,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2022-01-31 12:18:16,609 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2022-01-31 12:18:16,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:16,610 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2022-01-31 12:18:16,611 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 states have internal predecessors, (9), 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 12:18:16,611 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2022-01-31 12:18:16,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 12:18:16,611 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:16,612 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:16,612 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 12:18:16,613 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:16,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:16,616 INFO L85 PathProgramCache]: Analyzing trace with hash -637810695, now seen corresponding path program 1 times [2022-01-31 12:18:16,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:16,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725554818] [2022-01-31 12:18:16,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:16,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:16,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,732 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:16,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,750 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 12:18:16,750 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:16,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725554818] [2022-01-31 12:18:16,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725554818] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 12:18:16,751 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 12:18:16,751 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 12:18:16,751 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017124850] [2022-01-31 12:18:16,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 12:18:16,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 12:18:16,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:16,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 12:18:16,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 12:18:16,756 INFO L87 Difference]: Start difference. First operand 18 states and 20 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 12:18:16,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:16,826 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-01-31 12:18:16,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 12:18:16,827 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 12:18:16,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:16,829 INFO L225 Difference]: With dead ends: 25 [2022-01-31 12:18:16,829 INFO L226 Difference]: Without dead ends: 25 [2022-01-31 12:18:16,833 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 12:18:16,835 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:16,835 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 22 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 12:18:16,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-01-31 12:18:16,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2022-01-31 12:18:16,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:16,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-01-31 12:18:16,844 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-01-31 12:18:16,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:16,845 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-01-31 12:18:16,846 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 12:18:16,847 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-01-31 12:18:16,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 12:18:16,850 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:16,854 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:16,854 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 12:18:16,855 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:16,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:16,855 INFO L85 PathProgramCache]: Analyzing trace with hash -693433385, now seen corresponding path program 1 times [2022-01-31 12:18:16,855 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:16,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607792841] [2022-01-31 12:18:16,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:16,861 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:16,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:16,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:16,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 12:18:16,952 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:16,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607792841] [2022-01-31 12:18:16,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607792841] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:16,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177878302] [2022-01-31 12:18:16,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:16,953 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:16,953 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:16,976 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 12:18:16,991 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 12:18:17,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-31 12:18:17,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:18:17,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 12:18:17,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:18:17,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 12:18:17,127 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177878302] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:18:17,127 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:18:17,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-01-31 12:18:17,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381083457] [2022-01-31 12:18:17,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:18:17,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-31 12:18:17,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:17,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-31 12:18:17,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-01-31 12:18:17,129 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 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 12:18:17,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:17,222 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2022-01-31 12:18:17,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 12:18:17,222 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 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 17 [2022-01-31 12:18:17,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:17,223 INFO L225 Difference]: With dead ends: 45 [2022-01-31 12:18:17,223 INFO L226 Difference]: Without dead ends: 45 [2022-01-31 12:18:17,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-01-31 12:18:17,224 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 76 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:17,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 27 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 12:18:17,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-31 12:18:17,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 25. [2022-01-31 12:18:17,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:17,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-01-31 12:18:17,227 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2022-01-31 12:18:17,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:17,228 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-01-31 12:18:17,228 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 7 states have internal predecessors, (21), 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 12:18:17,228 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-01-31 12:18:17,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 12:18:17,228 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:17,228 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:17,247 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-01-31 12:18:17,446 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 12:18:17,447 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:17,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:17,448 INFO L85 PathProgramCache]: Analyzing trace with hash -859874703, now seen corresponding path program 2 times [2022-01-31 12:18:17,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:17,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620453709] [2022-01-31 12:18:17,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:17,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:17,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:17,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,508 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-31 12:18:17,508 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:17,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620453709] [2022-01-31 12:18:17,508 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620453709] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 12:18:17,508 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 12:18:17,508 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-01-31 12:18:17,509 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516941402] [2022-01-31 12:18:17,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 12:18:17,509 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-31 12:18:17,509 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:17,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-31 12:18:17,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-01-31 12:18:17,510 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:17,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:17,561 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2022-01-31 12:18:17,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 12:18:17,562 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-01-31 12:18:17,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:17,562 INFO L225 Difference]: With dead ends: 32 [2022-01-31 12:18:17,562 INFO L226 Difference]: Without dead ends: 29 [2022-01-31 12:18:17,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-01-31 12:18:17,563 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 25 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:17,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 31 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 12:18:17,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-31 12:18:17,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-01-31 12:18:17,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:17,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-01-31 12:18:17,566 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23 [2022-01-31 12:18:17,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:17,566 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-01-31 12:18:17,567 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:17,567 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-01-31 12:18:17,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-31 12:18:17,567 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:17,567 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 12:18:17,567 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 12:18:17,568 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:17,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:17,568 INFO L85 PathProgramCache]: Analyzing trace with hash 881682956, now seen corresponding path program 1 times [2022-01-31 12:18:17,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:17,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552530634] [2022-01-31 12:18:17,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:17,568 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:17,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:17,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,621 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-31 12:18:17,621 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:17,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552530634] [2022-01-31 12:18:17,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552530634] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:17,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387801229] [2022-01-31 12:18:17,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:17,622 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:17,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:17,623 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 12:18:17,624 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 12:18:17,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:17,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 6 conjunts are in the unsatisfiable core [2022-01-31 12:18:17,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:18:17,732 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-01-31 12:18:17,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:18:17,819 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-01-31 12:18:17,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387801229] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:18:17,820 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:18:17,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 16 [2022-01-31 12:18:17,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259780059] [2022-01-31 12:18:17,820 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:18:17,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 12:18:17,821 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:17,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 12:18:17,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2022-01-31 12:18:17,821 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:18,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:18,053 INFO L93 Difference]: Finished difference Result 88 states and 108 transitions. [2022-01-31 12:18:18,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 12:18:18,053 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-01-31 12:18:18,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:18,054 INFO L225 Difference]: With dead ends: 88 [2022-01-31 12:18:18,054 INFO L226 Difference]: Without dead ends: 82 [2022-01-31 12:18:18,055 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=531, Unknown=0, NotChecked=0, Total=756 [2022-01-31 12:18:18,055 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 173 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:18,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [173 Valid, 46 Invalid, 203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 12:18:18,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-01-31 12:18:18,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2022-01-31 12:18:18,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 51 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:18,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 63 transitions. [2022-01-31 12:18:18,060 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 63 transitions. Word has length 27 [2022-01-31 12:18:18,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:18,060 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 63 transitions. [2022-01-31 12:18:18,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:18,061 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 63 transitions. [2022-01-31 12:18:18,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 12:18:18,062 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:18,062 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:18,082 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-01-31 12:18:18,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:18,276 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:18,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:18,277 INFO L85 PathProgramCache]: Analyzing trace with hash 2068232748, now seen corresponding path program 2 times [2022-01-31 12:18:18,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:18,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239040455] [2022-01-31 12:18:18,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:18,277 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:18,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:18,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:18,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:18,391 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-01-31 12:18:18,391 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:18,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239040455] [2022-01-31 12:18:18,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239040455] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:18,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090788915] [2022-01-31 12:18:18,392 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-31 12:18:18,392 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:18,392 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:18,393 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 12:18:18,394 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 12:18:18,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-31 12:18:18,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:18:18,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2022-01-31 12:18:18,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:18:18,536 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-01-31 12:18:18,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:18:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-01-31 12:18:18,769 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090788915] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:18:18,769 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:18:18,769 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 26 [2022-01-31 12:18:18,769 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072025675] [2022-01-31 12:18:18,769 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:18:18,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 12:18:18,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:18,770 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 12:18:18,770 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2022-01-31 12:18:18,771 INFO L87 Difference]: Start difference. First operand 56 states and 63 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 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 12:18:19,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:19,272 INFO L93 Difference]: Finished difference Result 166 states and 207 transitions. [2022-01-31 12:18:19,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 12:18:19,273 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 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 55 [2022-01-31 12:18:19,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:19,274 INFO L225 Difference]: With dead ends: 166 [2022-01-31 12:18:19,274 INFO L226 Difference]: Without dead ends: 166 [2022-01-31 12:18:19,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=853, Invalid=1403, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 12:18:19,276 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 505 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 505 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:19,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [505 Valid, 27 Invalid, 348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 12:18:19,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-01-31 12:18:19,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 80. [2022-01-31 12:18:19,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 75 states have (on average 1.1066666666666667) internal successors, (83), 75 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:19,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 87 transitions. [2022-01-31 12:18:19,281 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 87 transitions. Word has length 55 [2022-01-31 12:18:19,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:19,281 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 87 transitions. [2022-01-31 12:18:19,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 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 12:18:19,282 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 87 transitions. [2022-01-31 12:18:19,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 12:18:19,282 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:19,282 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:19,300 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 12:18:19,496 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:19,497 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:19,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:19,497 INFO L85 PathProgramCache]: Analyzing trace with hash -838467180, now seen corresponding path program 3 times [2022-01-31 12:18:19,497 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:19,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982171686] [2022-01-31 12:18:19,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:19,497 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:19,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:19,789 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:19,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:19,794 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2022-01-31 12:18:19,794 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:19,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982171686] [2022-01-31 12:18:19,794 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982171686] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:19,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118590029] [2022-01-31 12:18:19,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-31 12:18:19,795 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:19,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:19,805 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 12:18:19,814 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 12:18:19,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-01-31 12:18:19,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:18:19,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2022-01-31 12:18:19,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:18:19,997 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-01-31 12:18:19,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:18:20,256 INFO L134 CoverageAnalysis]: Checked inductivity of 539 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2022-01-31 12:18:20,257 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [118590029] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:18:20,257 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:18:20,257 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 10, 10] total 35 [2022-01-31 12:18:20,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89426085] [2022-01-31 12:18:20,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:18:20,258 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 12:18:20,258 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:20,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 12:18:20,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 12:18:20,259 INFO L87 Difference]: Start difference. First operand 80 states and 87 transitions. Second operand has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:21,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:21,014 INFO L93 Difference]: Finished difference Result 218 states and 272 transitions. [2022-01-31 12:18:21,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 12:18:21,015 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2022-01-31 12:18:21,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:21,016 INFO L225 Difference]: With dead ends: 218 [2022-01-31 12:18:21,016 INFO L226 Difference]: Without dead ends: 192 [2022-01-31 12:18:21,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 179 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1441, Invalid=2849, Unknown=0, NotChecked=0, Total=4290 [2022-01-31 12:18:21,018 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 624 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 285 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:21,018 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 46 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 285 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 12:18:21,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2022-01-31 12:18:21,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2022-01-31 12:18:21,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.172972972972973) internal successors, (217), 185 states have internal predecessors, (217), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:21,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 221 transitions. [2022-01-31 12:18:21,026 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 221 transitions. Word has length 79 [2022-01-31 12:18:21,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:21,026 INFO L470 AbstractCegarLoop]: Abstraction has 190 states and 221 transitions. [2022-01-31 12:18:21,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.2) internal successors, (112), 33 states have internal predecessors, (112), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:21,027 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 221 transitions. [2022-01-31 12:18:21,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2022-01-31 12:18:21,028 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:21,028 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:21,045 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 12:18:21,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:21,242 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:21,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:21,242 INFO L85 PathProgramCache]: Analyzing trace with hash -1983528018, now seen corresponding path program 4 times [2022-01-31 12:18:21,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:21,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990681333] [2022-01-31 12:18:21,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:21,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:21,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:21,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:21,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:18:21,779 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:21,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990681333] [2022-01-31 12:18:21,779 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990681333] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:21,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746888053] [2022-01-31 12:18:21,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-31 12:18:21,779 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:21,780 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:21,781 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 12:18:21,789 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 12:18:21,918 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-31 12:18:21,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:18:21,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 564 conjuncts, 31 conjunts are in the unsatisfiable core [2022-01-31 12:18:21,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:18:22,174 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:18:22,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:18:23,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:18:23,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746888053] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:18:23,279 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:18:23,279 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-01-31 12:18:23,279 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326390129] [2022-01-31 12:18:23,280 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:18:23,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-01-31 12:18:23,280 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:18:23,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-01-31 12:18:23,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1955, Invalid=2077, Unknown=0, NotChecked=0, Total=4032 [2022-01-31 12:18:23,282 INFO L87 Difference]: Start difference. First operand 190 states and 221 transitions. Second operand has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 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 12:18:25,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:18:25,305 INFO L93 Difference]: Finished difference Result 408 states and 501 transitions. [2022-01-31 12:18:25,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-01-31 12:18:25,306 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 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 189 [2022-01-31 12:18:25,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:18:25,318 INFO L225 Difference]: With dead ends: 408 [2022-01-31 12:18:25,318 INFO L226 Difference]: Without dead ends: 408 [2022-01-31 12:18:25,336 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 349 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2379 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=5736, Invalid=9516, Unknown=0, NotChecked=0, Total=15252 [2022-01-31 12:18:25,336 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1429 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 495 mSolverCounterSat, 418 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1429 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 418 IncrementalHoareTripleChecker+Valid, 495 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 12:18:25,337 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1429 Valid, 52 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [418 Valid, 495 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 12:18:25,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2022-01-31 12:18:25,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 252. [2022-01-31 12:18:25,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 247 states have (on average 1.1295546558704452) internal successors, (279), 247 states have internal predecessors, (279), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:18:25,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 283 transitions. [2022-01-31 12:18:25,353 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 283 transitions. Word has length 189 [2022-01-31 12:18:25,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:18:25,355 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 283 transitions. [2022-01-31 12:18:25,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.109375) internal successors, (135), 63 states have internal predecessors, (135), 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 12:18:25,356 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 283 transitions. [2022-01-31 12:18:25,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 252 [2022-01-31 12:18:25,365 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:18:25,365 INFO L514 BasicCegarLoop]: trace histogram [60, 60, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:18:25,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-01-31 12:18:25,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:25,580 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:18:25,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:18:25,580 INFO L85 PathProgramCache]: Analyzing trace with hash -1726150512, now seen corresponding path program 5 times [2022-01-31 12:18:25,580 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:18:25,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75759620] [2022-01-31 12:18:25,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:18:25,581 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:18:25,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:26,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:18:26,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:18:26,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:18:26,915 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:18:26,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75759620] [2022-01-31 12:18:26,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75759620] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:18:26,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655712596] [2022-01-31 12:18:26,915 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-31 12:18:26,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:18:26,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:18:26,917 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 12:18:26,917 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-01-31 12:20:19,247 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 61 check-sat command(s) [2022-01-31 12:20:19,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:20:19,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 843 conjuncts, 62 conjunts are in the unsatisfiable core [2022-01-31 12:20:19,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:20:19,670 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:20:19,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:20:23,232 INFO L134 CoverageAnalysis]: Checked inductivity of 5311 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:20:23,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655712596] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:20:23,232 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:20:23,233 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 63, 63] total 126 [2022-01-31 12:20:23,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529814950] [2022-01-31 12:20:23,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:20:23,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-01-31 12:20:23,233 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:20:23,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-01-31 12:20:23,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7752, Invalid=7998, Unknown=0, NotChecked=0, Total=15750 [2022-01-31 12:20:23,237 INFO L87 Difference]: Start difference. First operand 252 states and 283 transitions. Second operand has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 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 12:20:30,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:20:30,710 INFO L93 Difference]: Finished difference Result 842 states and 1059 transitions. [2022-01-31 12:20:30,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 125 states. [2022-01-31 12:20:30,711 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 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 251 [2022-01-31 12:20:30,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:20:30,713 INFO L225 Difference]: With dead ends: 842 [2022-01-31 12:20:30,713 INFO L226 Difference]: Without dead ends: 842 [2022-01-31 12:20:30,718 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 688 GetRequests, 442 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9571 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=23003, Invalid=38253, Unknown=0, NotChecked=0, Total=61256 [2022-01-31 12:20:30,719 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3448 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 990 mSolverCounterSat, 960 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3448 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 960 IncrementalHoareTripleChecker+Valid, 990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 12:20:30,719 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3448 Valid, 42 Invalid, 1950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [960 Valid, 990 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 12:20:30,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-01-31 12:20:30,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 376. [2022-01-31 12:20:30,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 371 states have (on average 1.0862533692722371) internal successors, (403), 371 states have internal predecessors, (403), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:20:30,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 407 transitions. [2022-01-31 12:20:30,734 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 407 transitions. Word has length 251 [2022-01-31 12:20:30,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:20:30,734 INFO L470 AbstractCegarLoop]: Abstraction has 376 states and 407 transitions. [2022-01-31 12:20:30,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 126 states have (on average 2.0555555555555554) internal successors, (259), 125 states have internal predecessors, (259), 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 12:20:30,734 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 407 transitions. [2022-01-31 12:20:30,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2022-01-31 12:20:30,737 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:20:30,737 INFO L514 BasicCegarLoop]: trace histogram [122, 122, 30, 30, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:20:30,789 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-01-31 12:20:30,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:20:30,957 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:20:30,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:20:30,958 INFO L85 PathProgramCache]: Analyzing trace with hash -734465068, now seen corresponding path program 6 times [2022-01-31 12:20:30,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:20:30,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635739614] [2022-01-31 12:20:30,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:20:30,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:20:31,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:20:34,740 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:20:34,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:20:34,769 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 14884 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2022-01-31 12:20:34,770 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:20:34,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635739614] [2022-01-31 12:20:34,770 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635739614] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:20:34,770 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613857047] [2022-01-31 12:20:34,770 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-31 12:20:34,770 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:20:34,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:20:34,774 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-31 12:20:34,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-01-31 12:26:29,513 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 59 check-sat command(s) [2022-01-31 12:26:29,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:26:29,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 825 conjuncts, 33 conjunts are in the unsatisfiable core [2022-01-31 12:26:29,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:26:30,273 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-01-31 12:26:30,274 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:26:32,393 INFO L134 CoverageAnalysis]: Checked inductivity of 16595 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 14884 trivial. 0 not checked. [2022-01-31 12:26:32,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613857047] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:26:32,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:26:32,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 34, 34] total 159 [2022-01-31 12:26:32,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860279435] [2022-01-31 12:26:32,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:26:32,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 159 states [2022-01-31 12:26:32,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:26:32,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2022-01-31 12:26:32,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12096, Invalid=13026, Unknown=0, NotChecked=0, Total=25122 [2022-01-31 12:26:32,415 INFO L87 Difference]: Start difference. First operand 376 states and 407 transitions. Second operand has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:26:44,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:26:44,402 INFO L93 Difference]: Finished difference Result 1062 states and 1340 transitions. [2022-01-31 12:26:44,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 158 states. [2022-01-31 12:26:44,403 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 375 [2022-01-31 12:26:44,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:26:44,420 INFO L225 Difference]: With dead ends: 1062 [2022-01-31 12:26:44,420 INFO L226 Difference]: Without dead ends: 936 [2022-01-31 12:26:44,426 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1184 GetRequests, 871 SyntacticMatches, 1 SemanticMatches, 312 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13347 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=35975, Invalid=62307, Unknown=0, NotChecked=0, Total=98282 [2022-01-31 12:26:44,427 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 4048 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1261 mSolverCounterSat, 1594 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4048 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 2855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1594 IncrementalHoareTripleChecker+Valid, 1261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 12:26:44,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4048 Valid, 51 Invalid, 2855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1594 Valid, 1261 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 12:26:44,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2022-01-31 12:26:44,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 934. [2022-01-31 12:26:44,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 934 states, 929 states have (on average 1.1679224973089344) internal successors, (1085), 929 states have internal predecessors, (1085), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:26:44,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 934 states to 934 states and 1089 transitions. [2022-01-31 12:26:44,440 INFO L78 Accepts]: Start accepts. Automaton has 934 states and 1089 transitions. Word has length 375 [2022-01-31 12:26:44,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:26:44,440 INFO L470 AbstractCegarLoop]: Abstraction has 934 states and 1089 transitions. [2022-01-31 12:26:44,440 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 159 states, 159 states have (on average 3.169811320754717) internal successors, (504), 157 states have internal predecessors, (504), 4 states have call successors, (6), 4 states have call predecessors, (6), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:26:44,441 INFO L276 IsEmpty]: Start isEmpty. Operand 934 states and 1089 transitions. [2022-01-31 12:26:44,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2022-01-31 12:26:44,454 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:26:44,455 INFO L514 BasicCegarLoop]: trace histogram [154, 154, 153, 153, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:26:44,525 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-01-31 12:26:44,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:26:44,670 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:26:44,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:26:44,671 INFO L85 PathProgramCache]: Analyzing trace with hash -1253376950, now seen corresponding path program 7 times [2022-01-31 12:26:44,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:26:44,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202406703] [2022-01-31 12:26:44,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:26:44,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:26:44,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:26:49,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:26:49,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:26:49,752 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:26:49,752 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:26:49,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202406703] [2022-01-31 12:26:49,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202406703] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:26:49,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989901844] [2022-01-31 12:26:49,753 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-01-31 12:26:49,753 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:26:49,753 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:26:49,754 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-31 12:26:49,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-01-31 12:26:50,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:26:50,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 2672 conjuncts, 155 conjunts are in the unsatisfiable core [2022-01-31 12:26:50,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:26:51,334 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:26:51,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:27:07,384 INFO L134 CoverageAnalysis]: Checked inductivity of 70380 backedges. 0 proven. 23409 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:27:07,385 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1989901844] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:27:07,385 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:27:07,385 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [157, 156, 156] total 312 [2022-01-31 12:27:07,385 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480450032] [2022-01-31 12:27:07,385 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:27:07,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 312 states [2022-01-31 12:27:07,387 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:27:07,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 312 interpolants. [2022-01-31 12:27:07,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48207, Invalid=48825, Unknown=0, NotChecked=0, Total=97032 [2022-01-31 12:27:07,397 INFO L87 Difference]: Start difference. First operand 934 states and 1089 transitions. Second operand has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 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 12:28:59,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 12:28:59,269 INFO L93 Difference]: Finished difference Result 2020 states and 2485 transitions. [2022-01-31 12:28:59,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 311 states. [2022-01-31 12:28:59,270 INFO L78 Accepts]: Start accepts. Automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 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 933 [2022-01-31 12:28:59,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 12:28:59,278 INFO L225 Difference]: With dead ends: 2020 [2022-01-31 12:28:59,278 INFO L226 Difference]: Without dead ends: 2020 [2022-01-31 12:28:59,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2331 GetRequests, 1713 SyntacticMatches, 0 SemanticMatches, 618 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59977 ImplicationChecksByTransitivity, 37.9s TimeCoverageRelationStatistics Valid=143996, Invalid=239784, Unknown=0, NotChecked=0, Total=383780 [2022-01-31 12:28:59,293 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 10048 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 2357 mSolverCounterSat, 2729 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10048 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 5086 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2729 IncrementalHoareTripleChecker+Valid, 2357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-01-31 12:28:59,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10048 Valid, 47 Invalid, 5086 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2729 Valid, 2357 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-01-31 12:28:59,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2020 states. [2022-01-31 12:28:59,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2020 to 1244. [2022-01-31 12:28:59,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1244 states, 1239 states have (on average 1.12590799031477) internal successors, (1395), 1239 states have internal predecessors, (1395), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-31 12:28:59,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1244 states to 1244 states and 1399 transitions. [2022-01-31 12:28:59,310 INFO L78 Accepts]: Start accepts. Automaton has 1244 states and 1399 transitions. Word has length 933 [2022-01-31 12:28:59,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 12:28:59,311 INFO L470 AbstractCegarLoop]: Abstraction has 1244 states and 1399 transitions. [2022-01-31 12:28:59,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 312 states, 312 states have (on average 2.0224358974358974) internal successors, (631), 311 states have internal predecessors, (631), 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 12:28:59,311 INFO L276 IsEmpty]: Start isEmpty. Operand 1244 states and 1399 transitions. [2022-01-31 12:28:59,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1244 [2022-01-31 12:28:59,332 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 12:28:59,333 INFO L514 BasicCegarLoop]: trace histogram [308, 308, 154, 154, 153, 153, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 12:28:59,354 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-01-31 12:28:59,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-01-31 12:28:59,544 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 12:28:59,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 12:28:59,544 INFO L85 PathProgramCache]: Analyzing trace with hash 6256564, now seen corresponding path program 8 times [2022-01-31 12:28:59,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-31 12:28:59,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1081897184] [2022-01-31 12:28:59,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 12:28:59,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 12:29:00,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:29:18,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 12:29:18,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 12:29:18,100 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:29:18,101 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-31 12:29:18,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1081897184] [2022-01-31 12:29:18,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1081897184] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-31 12:29:18,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351268016] [2022-01-31 12:29:18,101 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-31 12:29:18,101 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-31 12:29:18,101 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 12:29:18,114 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-31 12:29:18,115 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-01-31 12:29:18,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-31 12:29:18,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-31 12:29:18,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 4067 conjuncts, 310 conjunts are in the unsatisfiable core [2022-01-31 12:29:18,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-31 12:29:20,208 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:29:20,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-31 12:30:15,917 INFO L134 CoverageAnalysis]: Checked inductivity of 141835 backedges. 0 proven. 94864 refuted. 0 times theorem prover too weak. 46971 trivial. 0 not checked. [2022-01-31 12:30:15,918 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351268016] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-31 12:30:15,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-31 12:30:15,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [312, 311, 311] total 622 [2022-01-31 12:30:15,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815985025] [2022-01-31 12:30:15,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-31 12:30:15,921 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 622 states [2022-01-31 12:30:15,921 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-31 12:30:15,981 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 622 interpolants. [2022-01-31 12:30:15,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192512, Invalid=193750, Unknown=0, NotChecked=0, Total=386262 [2022-01-31 12:30:15,995 INFO L87 Difference]: Start difference. First operand 1244 states and 1399 transitions. Second operand has 622 states, 622 states have (on average 2.0112540192926045) internal successors, (1251), 621 states have internal predecessors, (1251), 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)