/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Bitvector.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_valuebound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-a10ec3b [2022-01-10 03:19:57,710 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-10 03:19:57,712 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-10 03:19:57,749 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-10 03:19:57,816 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-10 03:19:57,817 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-10 03:19:57,821 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-10 03:19:57,822 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/BvToInt/svcomp-Reach-64bit-Automizer_Bitvector.epf [2022-01-10 03:19:57,861 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-10 03:19:57,861 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-10 03:19:57,861 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-10 03:19:57,862 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-10 03:19:57,862 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-01-10 03:19:57,862 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-01-10 03:19:57,863 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-10 03:19:57,863 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-10 03:19:57,863 INFO L138 SettingsManager]: * Use SBE=true [2022-01-10 03:19:57,863 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-10 03:19:57,864 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-10 03:19:57,865 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-10 03:19:57,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-10 03:19:57,866 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Trace refinement strategy=WOLF [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-10 03:19:57,867 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-10 03:19:57,868 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2022-01-10 03:19:57,868 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-10 03:19:58,106 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-10 03:19:58,134 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-10 03:19:58,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-10 03:19:58,137 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-10 03:19:58,138 INFO L275 PluginConnector]: CDTParser initialized [2022-01-10 03:19:58,139 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_valuebound100.c [2022-01-10 03:19:58,199 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4202145c9/e7bccc74f6524bb6aeccc2c911b9840f/FLAG11f8a1ee0 [2022-01-10 03:19:58,557 INFO L306 CDTParser]: Found 1 translation units. [2022-01-10 03:19:58,558 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_valuebound100.c [2022-01-10 03:19:58,564 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4202145c9/e7bccc74f6524bb6aeccc2c911b9840f/FLAG11f8a1ee0 [2022-01-10 03:19:58,973 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4202145c9/e7bccc74f6524bb6aeccc2c911b9840f [2022-01-10 03:19:58,975 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-10 03:19:58,977 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2022-01-10 03:19:58,979 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-10 03:19:58,979 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-10 03:19:58,982 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-10 03:19:58,982 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 03:19:58" (1/1) ... [2022-01-10 03:19:58,983 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3cef6f70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:58, skipping insertion in model container [2022-01-10 03:19:58,983 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.01 03:19:58" (1/1) ... [2022-01-10 03:19:58,994 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-10 03:19:59,009 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-10 03:19:59,148 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_valuebound100.c[537,550] [2022-01-10 03:19:59,166 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-10 03:19:59,196 INFO L203 MainTranslator]: Completed pre-run [2022-01-10 03:19:59,212 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_valuebound100.c[537,550] [2022-01-10 03:19:59,219 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-10 03:19:59,230 INFO L208 MainTranslator]: Completed translation [2022-01-10 03:19:59,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59 WrapperNode [2022-01-10 03:19:59,231 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-10 03:19:59,232 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-01-10 03:19:59,232 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-01-10 03:19:59,232 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-01-10 03:19:59,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,242 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,260 INFO L137 Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 55 [2022-01-10 03:19:59,260 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-01-10 03:19:59,261 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-10 03:19:59,261 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-10 03:19:59,261 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-10 03:19:59,268 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,268 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,270 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,270 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,286 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,290 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,291 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,300 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-10 03:19:59,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-10 03:19:59,301 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-10 03:19:59,301 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-10 03:19:59,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (1/1) ... [2022-01-10 03:19:59,317 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-10 03:19:59,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-10 03:19:59,341 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) [2022-01-10 03:19:59,371 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 [2022-01-10 03:19:59,391 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-10 03:19:59,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2022-01-10 03:19:59,391 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-01-10 03:19:59,391 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-01-10 03:19:59,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-10 03:19:59,392 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-10 03:19:59,392 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-10 03:19:59,392 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-10 03:19:59,444 INFO L234 CfgBuilder]: Building ICFG [2022-01-10 03:19:59,445 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-10 03:19:59,545 INFO L275 CfgBuilder]: Performing block encoding [2022-01-10 03:19:59,550 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-10 03:19:59,550 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-01-10 03:19:59,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 03:19:59 BoogieIcfgContainer [2022-01-10 03:19:59,552 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-10 03:19:59,553 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-10 03:19:59,553 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-10 03:19:59,556 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-10 03:19:59,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.01 03:19:58" (1/3) ... [2022-01-10 03:19:59,557 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f692826 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 03:19:59, skipping insertion in model container [2022-01-10 03:19:59,557 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.01 03:19:59" (2/3) ... [2022-01-10 03:19:59,558 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f692826 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.01 03:19:59, skipping insertion in model container [2022-01-10 03:19:59,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.01 03:19:59" (3/3) ... [2022-01-10 03:19:59,559 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_valuebound100.c [2022-01-10 03:19:59,563 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-10 03:19:59,563 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-10 03:19:59,598 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-10 03:19:59,604 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-10 03:19:59,604 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-10 03:19:59,618 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2022-01-10 03:19:59,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-01-10 03:19:59,623 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:19:59,624 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:19:59,624 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:19:59,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:19:59,629 INFO L85 PathProgramCache]: Analyzing trace with hash -487550744, now seen corresponding path program 1 times [2022-01-10 03:19:59,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:19:59,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [403689091] [2022-01-10 03:19:59,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:19:59,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:19:59,641 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:19:59,650 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:19:59,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2022-01-10 03:19:59,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:19:59,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 1 conjunts are in the unsatisfiable core [2022-01-10 03:19:59,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:19:59,834 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-01-10 03:19:59,834 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-10 03:19:59,835 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:19:59,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [403689091] [2022-01-10 03:19:59,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [403689091] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-10 03:19:59,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-10 03:19:59,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-01-10 03:19:59,838 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072282837] [2022-01-10 03:19:59,838 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:19:59,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-01-10 03:19:59,842 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:19:59,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-01-10 03:19:59,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-01-10 03:19:59,866 INFO L87 Difference]: Start difference. First operand has 33 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-01-10 03:19:59,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:19:59,885 INFO L93 Difference]: Finished difference Result 63 states and 104 transitions. [2022-01-10 03:19:59,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-01-10 03:19:59,886 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2022-01-10 03:19:59,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:19:59,893 INFO L225 Difference]: With dead ends: 63 [2022-01-10 03:19:59,893 INFO L226 Difference]: Without dead ends: 29 [2022-01-10 03:19:59,896 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-01-10 03:19:59,899 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-10 03:19:59,900 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-10 03:19:59,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-10 03:19:59,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-01-10 03:19:59,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-01-10 03:19:59,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 39 transitions. [2022-01-10 03:19:59,930 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 39 transitions. Word has length 24 [2022-01-10 03:19:59,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:19:59,931 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 39 transitions. [2022-01-10 03:19:59,931 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-01-10 03:19:59,931 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 39 transitions. [2022-01-10 03:19:59,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-01-10 03:19:59,933 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:19:59,933 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:19:59,942 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (2)] Ended with exit code 0 [2022-01-10 03:20:00,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:00,142 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:00,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:00,143 INFO L85 PathProgramCache]: Analyzing trace with hash -1636258074, now seen corresponding path program 1 times [2022-01-10 03:20:00,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:00,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1840345916] [2022-01-10 03:20:00,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:00,144 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:00,144 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:00,146 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:00,148 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2022-01-10 03:20:00,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:00,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-10 03:20:00,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:00,321 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-10 03:20:00,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-10 03:20:00,322 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:00,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1840345916] [2022-01-10 03:20:00,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1840345916] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-10 03:20:00,323 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-10 03:20:00,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-10 03:20:00,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904505018] [2022-01-10 03:20:00,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:00,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-10 03:20:00,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:00,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-10 03:20:00,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-01-10 03:20:00,326 INFO L87 Difference]: Start difference. First operand 29 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-01-10 03:20:00,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:00,415 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2022-01-10 03:20:00,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-10 03:20:00,416 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 24 [2022-01-10 03:20:00,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:00,418 INFO L225 Difference]: With dead ends: 42 [2022-01-10 03:20:00,419 INFO L226 Difference]: Without dead ends: 40 [2022-01-10 03:20:00,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-01-10 03:20:00,420 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 11 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:00,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 135 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-10 03:20:00,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-01-10 03:20:00,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-01-10 03:20:00,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-01-10 03:20:00,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2022-01-10 03:20:00,432 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 24 [2022-01-10 03:20:00,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:00,432 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2022-01-10 03:20:00,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-01-10 03:20:00,433 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2022-01-10 03:20:00,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-10 03:20:00,433 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:00,434 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:00,446 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:00,642 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:00,643 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:00,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:00,644 INFO L85 PathProgramCache]: Analyzing trace with hash 906849917, now seen corresponding path program 1 times [2022-01-10 03:20:00,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:00,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1489972189] [2022-01-10 03:20:00,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:00,645 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:00,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:00,646 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:00,649 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2022-01-10 03:20:00,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:00,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-10 03:20:00,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:00,749 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-01-10 03:20:00,749 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-10 03:20:00,750 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:00,750 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1489972189] [2022-01-10 03:20:00,750 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1489972189] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-10 03:20:00,750 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-10 03:20:00,750 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-10 03:20:00,750 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450577848] [2022-01-10 03:20:00,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:00,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-10 03:20:00,751 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:00,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-10 03:20:00,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-01-10 03:20:00,752 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-10 03:20:00,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:00,852 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2022-01-10 03:20:00,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-10 03:20:00,856 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2022-01-10 03:20:00,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:00,858 INFO L225 Difference]: With dead ends: 46 [2022-01-10 03:20:00,858 INFO L226 Difference]: Without dead ends: 44 [2022-01-10 03:20:00,858 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-01-10 03:20:00,860 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 11 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:00,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 131 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-10 03:20:00,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-01-10 03:20:00,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 37. [2022-01-10 03:20:00,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-01-10 03:20:00,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2022-01-10 03:20:00,868 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 29 [2022-01-10 03:20:00,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:00,869 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2022-01-10 03:20:00,869 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2022-01-10 03:20:00,869 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2022-01-10 03:20:00,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-01-10 03:20:00,870 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:00,870 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:00,883 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:01,071 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:01,071 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:01,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:01,072 INFO L85 PathProgramCache]: Analyzing trace with hash 710995206, now seen corresponding path program 1 times [2022-01-10 03:20:01,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:01,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1299296839] [2022-01-10 03:20:01,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:01,073 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:01,073 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:01,074 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:01,075 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2022-01-10 03:20:01,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:01,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 8 conjunts are in the unsatisfiable core [2022-01-10 03:20:01,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:01,334 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-01-10 03:20:01,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:01,636 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-10 03:20:01,637 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:01,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1299296839] [2022-01-10 03:20:01,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1299296839] provided 1 perfect and 1 imperfect interpolant sequences [2022-01-10 03:20:01,637 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-10 03:20:01,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2022-01-10 03:20:01,638 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235669615] [2022-01-10 03:20:01,638 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:01,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-10 03:20:01,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:01,639 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-10 03:20:01,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2022-01-10 03:20:01,639 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-10 03:20:03,758 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:03,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:03,962 INFO L93 Difference]: Finished difference Result 54 states and 69 transitions. [2022-01-10 03:20:03,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-10 03:20:03,963 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2022-01-10 03:20:03,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:03,964 INFO L225 Difference]: With dead ends: 54 [2022-01-10 03:20:03,964 INFO L226 Difference]: Without dead ends: 52 [2022-01-10 03:20:03,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-01-10 03:20:03,966 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 7 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:03,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 137 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 39 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-01-10 03:20:03,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-01-10 03:20:03,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 49. [2022-01-10 03:20:03,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 30 states have internal predecessors, (33), 15 states have call successors, (15), 5 states have call predecessors, (15), 5 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2022-01-10 03:20:03,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2022-01-10 03:20:03,974 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 34 [2022-01-10 03:20:03,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:03,975 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2022-01-10 03:20:03,975 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2022-01-10 03:20:03,975 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2022-01-10 03:20:03,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-10 03:20:03,976 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:03,976 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:03,985 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:04,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:04,180 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:04,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:04,180 INFO L85 PathProgramCache]: Analyzing trace with hash -1829555286, now seen corresponding path program 1 times [2022-01-10 03:20:04,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:04,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1167925814] [2022-01-10 03:20:04,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:04,181 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:04,181 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:04,182 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:04,183 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2022-01-10 03:20:04,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:04,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 11 conjunts are in the unsatisfiable core [2022-01-10 03:20:04,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-01-10 03:20:04,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:05,057 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2022-01-10 03:20:05,057 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:05,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1167925814] [2022-01-10 03:20:05,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1167925814] provided 1 perfect and 1 imperfect interpolant sequences [2022-01-10 03:20:05,058 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-10 03:20:05,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-01-10 03:20:05,058 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810412168] [2022-01-10 03:20:05,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:05,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-10 03:20:05,059 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:05,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-10 03:20:05,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2022-01-10 03:20:05,059 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-01-10 03:20:05,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:05,450 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2022-01-10 03:20:05,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-10 03:20:05,453 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 41 [2022-01-10 03:20:05,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:05,455 INFO L225 Difference]: With dead ends: 62 [2022-01-10 03:20:05,455 INFO L226 Difference]: Without dead ends: 60 [2022-01-10 03:20:05,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2022-01-10 03:20:05,457 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 8 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:05,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 129 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-10 03:20:05,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-01-10 03:20:05,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2022-01-10 03:20:05,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 36 states have internal predecessors, (41), 17 states have call successors, (17), 6 states have call predecessors, (17), 6 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2022-01-10 03:20:05,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2022-01-10 03:20:05,470 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 41 [2022-01-10 03:20:05,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:05,470 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2022-01-10 03:20:05,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2022-01-10 03:20:05,470 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2022-01-10 03:20:05,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-01-10 03:20:05,471 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:05,472 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:05,480 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (6)] Ended with exit code 0 [2022-01-10 03:20:05,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:05,680 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:05,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:05,680 INFO L85 PathProgramCache]: Analyzing trace with hash 105343995, now seen corresponding path program 1 times [2022-01-10 03:20:05,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:05,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1856531418] [2022-01-10 03:20:05,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:05,681 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:05,681 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:05,682 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:05,682 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2022-01-10 03:20:05,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:05,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 10 conjunts are in the unsatisfiable core [2022-01-10 03:20:05,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:06,014 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 13 proven. 7 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-01-10 03:20:06,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:06,583 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-01-10 03:20:06,583 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:06,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1856531418] [2022-01-10 03:20:06,584 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1856531418] provided 1 perfect and 1 imperfect interpolant sequences [2022-01-10 03:20:06,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-01-10 03:20:06,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [9] total 13 [2022-01-10 03:20:06,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723013337] [2022-01-10 03:20:06,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:06,584 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-01-10 03:20:06,584 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:06,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-01-10 03:20:06,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2022-01-10 03:20:06,585 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-01-10 03:20:08,728 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:08,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:08,952 INFO L93 Difference]: Finished difference Result 70 states and 89 transitions. [2022-01-10 03:20:08,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-10 03:20:08,953 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2022-01-10 03:20:08,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:08,954 INFO L225 Difference]: With dead ends: 70 [2022-01-10 03:20:08,954 INFO L226 Difference]: Without dead ends: 68 [2022-01-10 03:20:08,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-01-10 03:20:08,955 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 10 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:08,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 124 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 37 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2022-01-10 03:20:08,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-01-10 03:20:08,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 53. [2022-01-10 03:20:08,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 32 states have (on average 1.1875) internal successors, (38), 34 states have internal predecessors, (38), 14 states have call successors, (14), 6 states have call predecessors, (14), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2022-01-10 03:20:08,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 65 transitions. [2022-01-10 03:20:08,964 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 65 transitions. Word has length 51 [2022-01-10 03:20:08,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:08,964 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 65 transitions. [2022-01-10 03:20:08,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2022-01-10 03:20:08,965 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 65 transitions. [2022-01-10 03:20:08,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-01-10 03:20:08,966 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:08,966 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:08,977 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:09,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:09,175 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:09,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:09,176 INFO L85 PathProgramCache]: Analyzing trace with hash 957489548, now seen corresponding path program 1 times [2022-01-10 03:20:09,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:09,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1020615523] [2022-01-10 03:20:09,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:09,176 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:09,176 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:09,177 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:09,178 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Waiting until timeout for monitored process [2022-01-10 03:20:09,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:09,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 8 conjunts are in the unsatisfiable core [2022-01-10 03:20:09,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:09,439 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2022-01-10 03:20:09,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:09,710 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:09,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1020615523] [2022-01-10 03:20:09,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1020615523] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-10 03:20:09,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1090708612] [2022-01-10 03:20:09,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:09,711 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-01-10 03:20:09,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-01-10 03:20:09,713 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-01-10 03:20:09,714 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Waiting until timeout for monitored process [2022-01-10 03:20:09,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:09,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 8 conjunts are in the unsatisfiable core [2022-01-10 03:20:09,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:10,309 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-01-10 03:20:10,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:10,991 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-01-10 03:20:10,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1090708612] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 03:20:10,992 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-10 03:20:10,992 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 7] total 14 [2022-01-10 03:20:10,992 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669932879] [2022-01-10 03:20:10,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-10 03:20:10,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-10 03:20:10,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:10,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-10 03:20:10,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-01-10 03:20:10,994 INFO L87 Difference]: Start difference. First operand 53 states and 65 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-01-10 03:20:12,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:12,149 INFO L93 Difference]: Finished difference Result 72 states and 92 transitions. [2022-01-10 03:20:12,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-10 03:20:12,150 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) Word has length 52 [2022-01-10 03:20:12,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:12,151 INFO L225 Difference]: With dead ends: 72 [2022-01-10 03:20:12,151 INFO L226 Difference]: Without dead ends: 68 [2022-01-10 03:20:12,152 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 145 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-01-10 03:20:12,152 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 46 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 307 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:12,153 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 166 Invalid, 307 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 256 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-10 03:20:12,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-01-10 03:20:12,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2022-01-10 03:20:12,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 42 states have internal predecessors, (46), 20 states have call successors, (20), 7 states have call predecessors, (20), 7 states have return successors, (19), 17 states have call predecessors, (19), 19 states have call successors, (19) [2022-01-10 03:20:12,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 85 transitions. [2022-01-10 03:20:12,162 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 85 transitions. Word has length 52 [2022-01-10 03:20:12,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:12,162 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 85 transitions. [2022-01-10 03:20:12,162 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 5 states have call predecessors, (16), 5 states have call successors, (16) [2022-01-10 03:20:12,163 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 85 transitions. [2022-01-10 03:20:12,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-01-10 03:20:12,164 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:12,164 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:12,172 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (9)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:12,372 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (8)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:12,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:12,567 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:12,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:12,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1397226472, now seen corresponding path program 1 times [2022-01-10 03:20:12,568 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:12,568 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [45254835] [2022-01-10 03:20:12,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:12,568 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:12,568 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:12,569 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:12,570 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2022-01-10 03:20:12,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:12,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 2 conjunts are in the unsatisfiable core [2022-01-10 03:20:12,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:12,739 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2022-01-10 03:20:12,739 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-01-10 03:20:12,739 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:12,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [45254835] [2022-01-10 03:20:12,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [45254835] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-10 03:20:12,740 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-10 03:20:12,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-10 03:20:12,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483000655] [2022-01-10 03:20:12,740 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-10 03:20:12,741 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-10 03:20:12,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:12,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-10 03:20:12,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-10 03:20:12,741 INFO L87 Difference]: Start difference. First operand 67 states and 85 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-01-10 03:20:12,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:12,759 INFO L93 Difference]: Finished difference Result 94 states and 119 transitions. [2022-01-10 03:20:12,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-10 03:20:12,760 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2022-01-10 03:20:12,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:12,762 INFO L225 Difference]: With dead ends: 94 [2022-01-10 03:20:12,763 INFO L226 Difference]: Without dead ends: 63 [2022-01-10 03:20:12,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-10 03:20:12,765 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:12,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 75 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-10 03:20:12,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-10 03:20:12,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-01-10 03:20:12,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 37 states have (on average 1.162162162162162) internal successors, (43), 40 states have internal predecessors, (43), 18 states have call successors, (18), 7 states have call predecessors, (18), 7 states have return successors, (17), 15 states have call predecessors, (17), 17 states have call successors, (17) [2022-01-10 03:20:12,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 78 transitions. [2022-01-10 03:20:12,791 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 78 transitions. Word has length 54 [2022-01-10 03:20:12,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:12,791 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 78 transitions. [2022-01-10 03:20:12,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2022-01-10 03:20:12,791 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 78 transitions. [2022-01-10 03:20:12,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-10 03:20:12,792 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:12,793 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:12,804 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2022-01-10 03:20:12,993 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:12,993 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:12,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:12,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1754894755, now seen corresponding path program 1 times [2022-01-10 03:20:12,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:12,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1688949061] [2022-01-10 03:20:12,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:20:12,994 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:12,994 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:12,995 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:12,997 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2022-01-10 03:20:13,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:20:13,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 25 conjunts are in the unsatisfiable core [2022-01-10 03:20:13,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-01-10 03:20:14,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:18,883 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 7 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-01-10 03:20:18,884 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:18,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1688949061] [2022-01-10 03:20:18,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1688949061] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 03:20:18,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 03:20:18,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9] total 21 [2022-01-10 03:20:18,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540363458] [2022-01-10 03:20:18,884 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 03:20:18,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-10 03:20:18,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:18,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-10 03:20:18,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2022-01-10 03:20:18,886 INFO L87 Difference]: Start difference. First operand 63 states and 78 transitions. Second operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 17 states have internal predecessors, (36), 11 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2022-01-10 03:20:23,280 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:26,452 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:29,172 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:31,255 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.81s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:33,949 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:35,966 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:38,916 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.75s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:41,477 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:43,614 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:46,456 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:51,580 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:54,402 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:20:54,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:20:54,679 INFO L93 Difference]: Finished difference Result 159 states and 217 transitions. [2022-01-10 03:20:54,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-10 03:20:54,684 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 17 states have internal predecessors, (36), 11 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) Word has length 71 [2022-01-10 03:20:54,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:20:54,686 INFO L225 Difference]: With dead ends: 159 [2022-01-10 03:20:54,686 INFO L226 Difference]: Without dead ends: 132 [2022-01-10 03:20:54,687 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=213, Invalid=779, Unknown=0, NotChecked=0, Total=992 [2022-01-10 03:20:54,687 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 82 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 155 mSolverCounterUnsat, 9 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 9 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 29.0s IncrementalHoareTripleChecker+Time [2022-01-10 03:20:54,688 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 533 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 489 Invalid, 9 Unknown, 0 Unchecked, 29.0s Time] [2022-01-10 03:20:54,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2022-01-10 03:20:54,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 109. [2022-01-10 03:20:54,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 64 states have (on average 1.203125) internal successors, (77), 67 states have internal predecessors, (77), 33 states have call successors, (33), 11 states have call predecessors, (33), 11 states have return successors, (32), 30 states have call predecessors, (32), 32 states have call successors, (32) [2022-01-10 03:20:54,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2022-01-10 03:20:54,705 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 71 [2022-01-10 03:20:54,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:20:54,705 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2022-01-10 03:20:54,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 17 states have internal predecessors, (36), 11 states have call successors, (23), 3 states have call predecessors, (23), 2 states have return successors, (22), 10 states have call predecessors, (22), 9 states have call successors, (22) [2022-01-10 03:20:54,705 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2022-01-10 03:20:54,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-01-10 03:20:54,707 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:20:54,723 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:20:54,735 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (11)] Ended with exit code 0 [2022-01-10 03:20:54,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:20:54,933 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:20:54,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:20:54,934 INFO L85 PathProgramCache]: Analyzing trace with hash -2109273946, now seen corresponding path program 2 times [2022-01-10 03:20:54,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:20:54,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1138476841] [2022-01-10 03:20:54,934 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-10 03:20:54,934 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:20:54,935 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:20:54,935 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:20:54,940 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Waiting until timeout for monitored process [2022-01-10 03:20:55,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-10 03:20:55,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-10 03:20:55,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 12 conjunts are in the unsatisfiable core [2022-01-10 03:20:55,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:20:55,328 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 21 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2022-01-10 03:20:55,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:20:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 21 proven. 11 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2022-01-10 03:20:56,446 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:20:56,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1138476841] [2022-01-10 03:20:56,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1138476841] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-10 03:20:56,446 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-01-10 03:20:56,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 16 [2022-01-10 03:20:56,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021882648] [2022-01-10 03:20:56,447 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-01-10 03:20:56,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-10 03:20:56,447 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2022-01-10 03:20:56,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-10 03:20:56,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2022-01-10 03:20:56,448 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-01-10 03:20:59,644 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.72s for a HTC check with result VALID. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:21:02,360 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, BitVec], hasArrays=false, hasNonlinArith=false, quantifiers [] [2022-01-10 03:21:02,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-10 03:21:02,923 INFO L93 Difference]: Finished difference Result 160 states and 214 transitions. [2022-01-10 03:21:02,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-10 03:21:02,923 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) Word has length 76 [2022-01-10 03:21:02,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-10 03:21:02,924 INFO L225 Difference]: With dead ends: 160 [2022-01-10 03:21:02,924 INFO L226 Difference]: Without dead ends: 134 [2022-01-10 03:21:02,925 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 135 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2022-01-10 03:21:02,925 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 65 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 314 mSolverCounterSat, 87 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 440 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 314 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-01-10 03:21:02,926 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 440 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 314 Invalid, 1 Unknown, 0 Unchecked, 5.5s Time] [2022-01-10 03:21:02,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-01-10 03:21:02,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 130. [2022-01-10 03:21:02,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 76 states have (on average 1.1710526315789473) internal successors, (89), 80 states have internal predecessors, (89), 40 states have call successors, (40), 13 states have call predecessors, (40), 13 states have return successors, (38), 36 states have call predecessors, (38), 38 states have call successors, (38) [2022-01-10 03:21:02,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 167 transitions. [2022-01-10 03:21:02,948 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 167 transitions. Word has length 76 [2022-01-10 03:21:02,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-10 03:21:02,948 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 167 transitions. [2022-01-10 03:21:02,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 12 states have internal predecessors, (37), 8 states have call successors, (24), 3 states have call predecessors, (24), 2 states have return successors, (23), 8 states have call predecessors, (23), 8 states have call successors, (23) [2022-01-10 03:21:02,948 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 167 transitions. [2022-01-10 03:21:02,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-01-10 03:21:02,950 INFO L506 BasicCegarLoop]: Found error trace [2022-01-10 03:21:02,950 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-10 03:21:02,958 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (12)] Forceful destruction successful, exit code 0 [2022-01-10 03:21:03,150 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 [2022-01-10 03:21:03,151 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-10 03:21:03,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-10 03:21:03,151 INFO L85 PathProgramCache]: Analyzing trace with hash -1620227847, now seen corresponding path program 1 times [2022-01-10 03:21:03,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy WOLF [2022-01-10 03:21:03,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [272184532] [2022-01-10 03:21:03,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:21:03,152 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2022-01-10 03:21:03,152 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat [2022-01-10 03:21:03,153 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2022-01-10 03:21:03,153 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2022-01-10 03:21:03,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:21:03,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 16 conjunts are in the unsatisfiable core [2022-01-10 03:21:03,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:21:04,060 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-01-10 03:21:04,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-10 03:21:05,928 INFO L139 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2022-01-10 03:21:05,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [272184532] [2022-01-10 03:21:05,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [272184532] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-10 03:21:05,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1825767791] [2022-01-10 03:21:05,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-10 03:21:05,928 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2022-01-10 03:21:05,928 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 [2022-01-10 03:21:05,929 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2022-01-10 03:21:05,930 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2022-01-10 03:21:06,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-10 03:21:06,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 20 conjunts are in the unsatisfiable core [2022-01-10 03:21:06,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-10 03:21:06,877 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 65 proven. 27 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2022-01-10 03:21:06,878 INFO L328 TraceCheckSpWp]: Computing backward predicates...