/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 13:31:03,866 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 13:31:03,868 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 13:31:03,918 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-20 13:31:03,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 13:31:03,959 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 13:31:03,960 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 13:31:03,961 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-03-20 13:31:03,968 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 13:31:03,969 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 13:31:03,970 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * sizeof long=4 [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 13:31:03,971 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 13:31:03,972 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 13:31:03,972 INFO L138 SettingsManager]: * sizeof long double=12 [2022-03-20 13:31:03,972 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 13:31:03,972 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 13:31:03,972 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 13:31:03,972 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:31:03,973 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 13:31:03,973 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 13:31:03,974 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-03-20 13:31:03,974 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 13:31:04,173 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 13:31:04,194 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 13:31:04,196 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 13:31:04,197 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 13:31:04,197 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 13:31:04,198 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/watermelon.c [2022-03-20 13:31:04,240 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b82de6a42/c15e8285c38e4a2f9343da6876195a0a/FLAGe7bae3fd8 [2022-03-20 13:31:04,597 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 13:31:04,598 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c [2022-03-20 13:31:04,603 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b82de6a42/c15e8285c38e4a2f9343da6876195a0a/FLAGe7bae3fd8 [2022-03-20 13:31:04,617 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b82de6a42/c15e8285c38e4a2f9343da6876195a0a [2022-03-20 13:31:04,621 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 13:31:04,622 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 13:31:04,624 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 13:31:04,624 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 13:31:04,627 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 13:31:04,628 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,629 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f7d50ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04, skipping insertion in model container [2022-03-20 13:31:04,629 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,633 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 13:31:04,648 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 13:31:04,776 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2022-03-20 13:31:04,807 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:31:04,813 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 13:31:04,822 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/watermelon.c[373,386] [2022-03-20 13:31:04,834 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 13:31:04,845 INFO L208 MainTranslator]: Completed translation [2022-03-20 13:31:04,845 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04 WrapperNode [2022-03-20 13:31:04,846 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 13:31:04,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 13:31:04,847 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 13:31:04,847 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 13:31:04,855 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,855 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,861 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,861 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,868 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,875 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,879 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 13:31:04,882 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 13:31:04,882 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 13:31:04,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 13:31:04,883 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (1/1) ... [2022-03-20 13:31:04,888 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 13:31:04,895 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:04,905 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-20 13:31:04,925 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-20 13:31:04,950 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure correct_version [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure student_version [2022-03-20 13:31:04,951 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 13:31:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 13:31:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 13:31:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 13:31:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 13:31:04,951 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure correct_version [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure student_version [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 13:31:04,952 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 13:31:04,992 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 13:31:04,993 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 13:31:05,157 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 13:31:05,161 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 13:31:05,161 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-03-20 13:31:05,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:31:05 BoogieIcfgContainer [2022-03-20 13:31:05,162 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 13:31:05,163 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 13:31:05,163 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 13:31:05,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 13:31:05,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 01:31:04" (1/3) ... [2022-03-20 13:31:05,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50e232d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:31:05, skipping insertion in model container [2022-03-20 13:31:05,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 01:31:04" (2/3) ... [2022-03-20 13:31:05,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50e232d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 01:31:05, skipping insertion in model container [2022-03-20 13:31:05,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 01:31:05" (3/3) ... [2022-03-20 13:31:05,171 INFO L111 eAbstractionObserver]: Analyzing ICFG watermelon.c [2022-03-20 13:31:05,174 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 13:31:05,174 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 13:31:05,228 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 13:31:05,234 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-20 13:31:05,234 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 13:31:05,245 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-03-20 13:31:05,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-20 13:31:05,249 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:05,249 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:31:05,250 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:05,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:05,253 INFO L85 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 1 times [2022-03-20 13:31:05,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:05,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1905625328] [2022-03-20 13:31:05,271 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:31:05,271 INFO L85 PathProgramCache]: Analyzing trace with hash 345664661, now seen corresponding path program 2 times [2022-03-20 13:31:05,273 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:05,273 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144473249] [2022-03-20 13:31:05,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:05,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:05,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:05,508 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:05,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:05,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:05,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:05,560 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-03-20 13:31:05,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:05,596 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:05,597 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:05,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144473249] [2022-03-20 13:31:05,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144473249] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:05,598 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:05,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 13:31:05,600 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:05,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1905625328] [2022-03-20 13:31:05,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1905625328] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:05,600 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:05,600 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 13:31:05,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216443106] [2022-03-20 13:31:05,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:05,603 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 13:31:05,603 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:05,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 13:31:05,624 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2022-03-20 13:31:05,625 INFO L87 Difference]: Start difference. First operand has 39 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 29 states have internal predecessors, (38), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:05,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:05,971 INFO L93 Difference]: Finished difference Result 91 states and 114 transitions. [2022-03-20 13:31:05,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 13:31:05,973 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-03-20 13:31:05,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:05,978 INFO L225 Difference]: With dead ends: 91 [2022-03-20 13:31:05,978 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 13:31:05,980 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=515, Unknown=0, NotChecked=0, Total=600 [2022-03-20 13:31:05,982 INFO L913 BasicCegarLoop]: 32 mSDtfsCounter, 63 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 460 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:05,982 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 89 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 460 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:31:05,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 13:31:06,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2022-03-20 13:31:06,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 30 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:06,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2022-03-20 13:31:06,007 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 25 [2022-03-20 13:31:06,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:06,007 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2022-03-20 13:31:06,007 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:06,007 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2022-03-20 13:31:06,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 13:31:06,008 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:06,008 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 13:31:06,008 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 13:31:06,009 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:06,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:06,009 INFO L85 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 1 times [2022-03-20 13:31:06,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1782164843] [2022-03-20 13:31:06,010 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:31:06,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1324779677, now seen corresponding path program 2 times [2022-03-20 13:31:06,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:06,010 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604343110] [2022-03-20 13:31:06,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:06,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:06,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,036 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:06,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:06,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-03-20 13:31:06,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,056 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:06,056 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:06,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604343110] [2022-03-20 13:31:06,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604343110] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,056 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 13:31:06,057 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:06,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1782164843] [2022-03-20 13:31:06,057 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1782164843] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,057 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,057 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 13:31:06,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922333262] [2022-03-20 13:31:06,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:06,058 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 13:31:06,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 13:31:06,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 13:31:06,059 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:06,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:06,105 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2022-03-20 13:31:06,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 13:31:06,106 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 27 [2022-03-20 13:31:06,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:06,107 INFO L225 Difference]: With dead ends: 55 [2022-03-20 13:31:06,107 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 13:31:06,107 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 13:31:06,108 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 29 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:06,108 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:31:06,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 13:31:06,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2022-03-20 13:31:06,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 29 states have (on average 1.206896551724138) internal successors, (35), 31 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:06,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2022-03-20 13:31:06,115 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 27 [2022-03-20 13:31:06,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:06,116 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2022-03-20 13:31:06,116 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:06,116 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2022-03-20 13:31:06,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-20 13:31:06,117 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:06,117 INFO L499 BasicCegarLoop]: trace histogram [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] [2022-03-20 13:31:06,117 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-20 13:31:06,117 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:06,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:06,117 INFO L85 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 1 times [2022-03-20 13:31:06,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,118 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2024644874] [2022-03-20 13:31:06,118 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 13:31:06,118 INFO L85 PathProgramCache]: Analyzing trace with hash -855151641, now seen corresponding path program 2 times [2022-03-20 13:31:06,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:06,119 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297140171] [2022-03-20 13:31:06,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:06,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:06,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:06,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,144 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:06,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2022-03-20 13:31:06,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:06,157 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:06,157 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297140171] [2022-03-20 13:31:06,157 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297140171] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,157 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,157 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 13:31:06,157 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:06,158 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2024644874] [2022-03-20 13:31:06,158 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2024644874] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,158 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,158 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-20 13:31:06,158 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128197386] [2022-03-20 13:31:06,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:06,158 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-20 13:31:06,159 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,159 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-20 13:31:06,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-20 13:31:06,159 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:06,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:06,259 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2022-03-20 13:31:06,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-20 13:31:06,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2022-03-20 13:31:06,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:06,260 INFO L225 Difference]: With dead ends: 72 [2022-03-20 13:31:06,260 INFO L226 Difference]: Without dead ends: 43 [2022-03-20 13:31:06,260 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-20 13:31:06,261 INFO L913 BasicCegarLoop]: 26 mSDtfsCounter, 29 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:06,261 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-20 13:31:06,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-20 13:31:06,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2022-03-20 13:31:06,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2) internal successors, (36), 32 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:06,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2022-03-20 13:31:06,270 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 27 [2022-03-20 13:31:06,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:06,271 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2022-03-20 13:31:06,271 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:06,271 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2022-03-20 13:31:06,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 13:31:06,272 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:06,272 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1] [2022-03-20 13:31:06,272 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 13:31:06,274 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:06,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:06,275 INFO L85 PathProgramCache]: Analyzing trace with hash 743790053, now seen corresponding path program 1 times [2022-03-20 13:31:06,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [651788728] [2022-03-20 13:31:06,344 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:06,345 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:06,345 INFO L85 PathProgramCache]: Analyzing trace with hash -1203586262, now seen corresponding path program 1 times [2022-03-20 13:31:06,346 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:06,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282769090] [2022-03-20 13:31:06,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:06,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:06,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,388 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:06,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:06,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,409 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2022-03-20 13:31:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:06,449 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:06,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282769090] [2022-03-20 13:31:06,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282769090] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,449 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 13:31:06,593 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:06,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [651788728] [2022-03-20 13:31:06,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [651788728] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,593 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:31:06,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786965564] [2022-03-20 13:31:06,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:06,594 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 13:31:06,595 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,595 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 13:31:06,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-03-20 13:31:06,595 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:06,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:06,779 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2022-03-20 13:31:06,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 13:31:06,779 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-03-20 13:31:06,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:06,780 INFO L225 Difference]: With dead ends: 56 [2022-03-20 13:31:06,780 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 13:31:06,781 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-03-20 13:31:06,781 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 18 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:06,781 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 58 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 240 Invalid, 0 Unknown, 18 Unchecked, 0.1s Time] [2022-03-20 13:31:06,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 13:31:06,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2022-03-20 13:31:06,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1666666666666667) internal successors, (35), 32 states have internal predecessors, (35), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:06,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2022-03-20 13:31:06,787 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 29 [2022-03-20 13:31:06,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:06,787 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2022-03-20 13:31:06,788 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:06,788 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2022-03-20 13:31:06,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-20 13:31:06,788 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:06,788 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1] [2022-03-20 13:31:06,788 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-03-20 13:31:06,788 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:06,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:06,789 INFO L85 PathProgramCache]: Analyzing trace with hash 198429957, now seen corresponding path program 1 times [2022-03-20 13:31:06,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,789 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1801808015] [2022-03-20 13:31:06,828 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:06,828 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:06,828 INFO L85 PathProgramCache]: Analyzing trace with hash -755394225, now seen corresponding path program 1 times [2022-03-20 13:31:06,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:06,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1533975373] [2022-03-20 13:31:06,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:06,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:06,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:06,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,867 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:06,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:06,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:06,906 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:06,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1533975373] [2022-03-20 13:31:06,906 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1533975373] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,906 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,906 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 13:31:06,997 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:06,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1801808015] [2022-03-20 13:31:06,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1801808015] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:06,997 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:06,998 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-20 13:31:06,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199552217] [2022-03-20 13:31:06,998 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:06,998 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 13:31:06,998 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:06,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 13:31:06,998 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2022-03-20 13:31:06,999 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:07,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:07,147 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2022-03-20 13:31:07,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 13:31:07,148 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2022-03-20 13:31:07,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:07,148 INFO L225 Difference]: With dead ends: 51 [2022-03-20 13:31:07,148 INFO L226 Difference]: Without dead ends: 42 [2022-03-20 13:31:07,149 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-03-20 13:31:07,149 INFO L913 BasicCegarLoop]: 19 mSDtfsCounter, 65 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:07,149 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 51 Invalid, 198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 178 Invalid, 0 Unknown, 6 Unchecked, 0.1s Time] [2022-03-20 13:31:07,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-20 13:31:07,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-20 13:31:07,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 32 states have internal predecessors, (34), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:07,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2022-03-20 13:31:07,156 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 29 [2022-03-20 13:31:07,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:07,156 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2022-03-20 13:31:07,156 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:07,156 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2022-03-20 13:31:07,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-20 13:31:07,157 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:07,157 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1] [2022-03-20 13:31:07,157 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 13:31:07,157 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:07,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:07,157 INFO L85 PathProgramCache]: Analyzing trace with hash 1589989783, now seen corresponding path program 1 times [2022-03-20 13:31:07,158 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:07,158 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2064157965] [2022-03-20 13:31:07,185 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:07,186 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:07,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1886734625, now seen corresponding path program 1 times [2022-03-20 13:31:07,186 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:07,186 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42965517] [2022-03-20 13:31:07,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:07,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:07,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:07,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:07,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:07,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:07,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:07,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:07,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:07,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:07,280 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:07,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42965517] [2022-03-20 13:31:07,280 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42965517] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:31:07,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075617167] [2022-03-20 13:31:07,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:07,280 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:07,280 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:07,307 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:31:07,374 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 13:31:07,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:07,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 4 conjunts are in the unsatisfiable core [2022-03-20 13:31:07,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:31:07,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:07,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:31:07,528 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:07,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075617167] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:31:07,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:31:07,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2022-03-20 13:31:07,539 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:07,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2064157965] [2022-03-20 13:31:07,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2064157965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:07,539 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:07,540 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-20 13:31:07,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423907111] [2022-03-20 13:31:07,540 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:07,540 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-20 13:31:07,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:07,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-20 13:31:07,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2022-03-20 13:31:07,541 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:07,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:07,659 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2022-03-20 13:31:07,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-20 13:31:07,659 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 33 [2022-03-20 13:31:07,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:07,660 INFO L225 Difference]: With dead ends: 58 [2022-03-20 13:31:07,660 INFO L226 Difference]: Without dead ends: 45 [2022-03-20 13:31:07,660 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2022-03-20 13:31:07,661 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 36 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:07,661 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 39 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:31:07,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-20 13:31:07,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2022-03-20 13:31:07,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:07,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2022-03-20 13:31:07,689 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 33 [2022-03-20 13:31:07,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:07,689 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2022-03-20 13:31:07,689 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:07,689 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2022-03-20 13:31:07,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 13:31:07,690 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:07,690 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:31:07,712 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 13:31:07,896 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-03-20 13:31:07,896 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:07,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:07,897 INFO L85 PathProgramCache]: Analyzing trace with hash 1518564121, now seen corresponding path program 2 times [2022-03-20 13:31:07,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:07,897 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2005655238] [2022-03-20 13:31:07,947 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:07,947 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:07,947 INFO L85 PathProgramCache]: Analyzing trace with hash 1283063907, now seen corresponding path program 1 times [2022-03-20 13:31:07,948 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:07,948 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119106283] [2022-03-20 13:31:07,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:07,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:07,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:08,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:08,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:08,015 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:08,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:08,108 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:08,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:08,184 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:08,184 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:08,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119106283] [2022-03-20 13:31:08,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [119106283] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:31:08,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974221992] [2022-03-20 13:31:08,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:08,184 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:08,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:08,185 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:31:08,186 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 13:31:08,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:08,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-20 13:31:08,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:31:08,531 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:08,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:31:09,063 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:09,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974221992] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:31:09,064 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:31:09,064 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 13] total 31 [2022-03-20 13:31:09,263 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:09,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2005655238] [2022-03-20 13:31:09,263 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2005655238] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:09,263 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:09,263 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-20 13:31:09,263 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531238970] [2022-03-20 13:31:09,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:09,264 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-20 13:31:09,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:09,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-20 13:31:09,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=1192, Unknown=0, NotChecked=0, Total=1406 [2022-03-20 13:31:09,265 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:11,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:11,561 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-03-20 13:31:11,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-20 13:31:11,561 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2022-03-20 13:31:11,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:11,562 INFO L225 Difference]: With dead ends: 62 [2022-03-20 13:31:11,562 INFO L226 Difference]: Without dead ends: 56 [2022-03-20 13:31:11,563 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 52 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=324, Invalid=1931, Unknown=1, NotChecked=0, Total=2256 [2022-03-20 13:31:11,563 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 48 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:11,563 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 62 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 221 Invalid, 0 Unknown, 48 Unchecked, 0.1s Time] [2022-03-20 13:31:11,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-03-20 13:31:11,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 47. [2022-03-20 13:31:11,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 37 states have internal predecessors, (41), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:11,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2022-03-20 13:31:11,571 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 35 [2022-03-20 13:31:11,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:11,571 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2022-03-20 13:31:11,571 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 1.5) internal successors, (27), 18 states have internal predecessors, (27), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:11,571 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2022-03-20 13:31:11,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 13:31:11,572 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:11,572 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:31:11,590 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 13:31:11,787 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-03-20 13:31:11,787 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:11,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:11,788 INFO L85 PathProgramCache]: Analyzing trace with hash 1057360469, now seen corresponding path program 1 times [2022-03-20 13:31:11,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:11,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [416956273] [2022-03-20 13:31:11,816 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:11,817 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:11,817 INFO L85 PathProgramCache]: Analyzing trace with hash -1117591585, now seen corresponding path program 1 times [2022-03-20 13:31:11,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:11,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466073212] [2022-03-20 13:31:11,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:11,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:11,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:11,834 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:11,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:11,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:11,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:11,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:11,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:11,864 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:11,864 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:11,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466073212] [2022-03-20 13:31:11,864 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466073212] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:31:11,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604061175] [2022-03-20 13:31:11,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:11,865 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:11,865 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:11,866 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:31:11,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-20 13:31:11,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:11,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-20 13:31:11,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:31:11,983 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:11,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:31:12,045 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:12,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604061175] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:31:12,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:31:12,046 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 11 [2022-03-20 13:31:12,062 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:12,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [416956273] [2022-03-20 13:31:12,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [416956273] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:12,062 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:12,062 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 13:31:12,062 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342966530] [2022-03-20 13:31:12,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:12,062 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 13:31:12,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:12,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 13:31:12,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2022-03-20 13:31:12,063 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:12,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:12,200 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2022-03-20 13:31:12,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 13:31:12,200 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 35 [2022-03-20 13:31:12,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:12,201 INFO L225 Difference]: With dead ends: 59 [2022-03-20 13:31:12,201 INFO L226 Difference]: Without dead ends: 50 [2022-03-20 13:31:12,201 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-03-20 13:31:12,201 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 45 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:12,202 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 47 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 13:31:12,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-20 13:31:12,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2022-03-20 13:31:12,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 35 states have (on average 1.1428571428571428) internal successors, (40), 37 states have internal predecessors, (40), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:31:12,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2022-03-20 13:31:12,209 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 35 [2022-03-20 13:31:12,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:12,209 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2022-03-20 13:31:12,209 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-03-20 13:31:12,209 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2022-03-20 13:31:12,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-20 13:31:12,209 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:12,210 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:31:12,239 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-20 13:31:12,425 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:12,426 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:12,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:12,426 INFO L85 PathProgramCache]: Analyzing trace with hash 1737418839, now seen corresponding path program 1 times [2022-03-20 13:31:12,426 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:12,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1069574666] [2022-03-20 13:31:12,468 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:12,468 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:12,468 INFO L85 PathProgramCache]: Analyzing trace with hash 1917982241, now seen corresponding path program 1 times [2022-03-20 13:31:12,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:12,469 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980127413] [2022-03-20 13:31:12,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:12,469 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:12,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:12,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:12,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:12,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:12,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:12,554 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:12,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:12,583 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-03-20 13:31:12,583 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:12,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980127413] [2022-03-20 13:31:12,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980127413] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:12,583 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:12,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 13:31:12,613 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:12,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1069574666] [2022-03-20 13:31:12,613 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1069574666] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:12,613 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:12,613 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-20 13:31:12,613 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045373014] [2022-03-20 13:31:12,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:12,614 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-20 13:31:12,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:12,615 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-20 13:31:12,615 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2022-03-20 13:31:12,615 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:12,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:12,908 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-03-20 13:31:12,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 13:31:12,908 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 35 [2022-03-20 13:31:12,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:12,909 INFO L225 Difference]: With dead ends: 58 [2022-03-20 13:31:12,909 INFO L226 Difference]: Without dead ends: 48 [2022-03-20 13:31:12,909 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=600, Unknown=0, NotChecked=0, Total=702 [2022-03-20 13:31:12,910 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 43 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:12,910 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 69 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-20 13:31:12,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-20 13:31:12,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2022-03-20 13:31:12,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 36 states have internal predecessors, (38), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2022-03-20 13:31:12,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2022-03-20 13:31:12,916 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 35 [2022-03-20 13:31:12,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:12,917 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2022-03-20 13:31:12,917 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:12,917 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2022-03-20 13:31:12,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 13:31:12,917 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:12,917 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2022-03-20 13:31:12,917 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-03-20 13:31:12,917 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:12,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:12,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1597979675, now seen corresponding path program 3 times [2022-03-20 13:31:12,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:12,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1368960640] [2022-03-20 13:31:12,971 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:12,971 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:12,971 INFO L85 PathProgramCache]: Analyzing trace with hash -771661915, now seen corresponding path program 1 times [2022-03-20 13:31:12,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:12,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072785283] [2022-03-20 13:31:12,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:12,972 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:12,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:13,010 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:13,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:13,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:13,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:13,093 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:13,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:13,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:13,189 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:13,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072785283] [2022-03-20 13:31:13,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072785283] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:31:13,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626737220] [2022-03-20 13:31:13,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:13,189 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:13,189 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:13,190 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:31:13,191 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-20 13:31:13,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:13,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:31:13,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:31:13,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:13,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:31:15,008 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:15,009 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626737220] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:31:15,009 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:31:15,009 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 33 [2022-03-20 13:31:37,874 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:31:37,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1368960640] [2022-03-20 13:31:37,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1368960640] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:31:37,874 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:31:37,874 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-20 13:31:37,874 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729547918] [2022-03-20 13:31:37,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:31:37,875 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-20 13:31:37,875 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:37,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-20 13:31:37,875 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=1331, Unknown=7, NotChecked=0, Total=1560 [2022-03-20 13:31:37,876 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:43,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:31:43,230 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-03-20 13:31:43,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 13:31:43,231 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2022-03-20 13:31:43,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:31:43,232 INFO L225 Difference]: With dead ends: 75 [2022-03-20 13:31:43,232 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 13:31:43,233 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 839 ImplicationChecksByTransitivity, 26.4s TimeCoverageRelationStatistics Valid=333, Invalid=2311, Unknown=8, NotChecked=0, Total=2652 [2022-03-20 13:31:43,233 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 63 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 374 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-20 13:31:43,233 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 90 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 374 Invalid, 0 Unknown, 138 Unchecked, 0.6s Time] [2022-03-20 13:31:43,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 13:31:43,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 60. [2022-03-20 13:31:43,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 49 states have internal predecessors, (53), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 13:31:43,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2022-03-20 13:31:43,242 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 37 [2022-03-20 13:31:43,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:31:43,242 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2022-03-20 13:31:43,242 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:31:43,242 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2022-03-20 13:31:43,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-20 13:31:43,243 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:31:43,243 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2022-03-20 13:31:43,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-20 13:31:43,450 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:43,450 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:31:43,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:31:43,451 INFO L85 PathProgramCache]: Analyzing trace with hash 783907799, now seen corresponding path program 2 times [2022-03-20 13:31:43,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:31:43,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1673681247] [2022-03-20 13:31:43,511 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:31:43,512 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:31:43,512 INFO L85 PathProgramCache]: Analyzing trace with hash -1383145567, now seen corresponding path program 1 times [2022-03-20 13:31:43,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:31:43,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716326444] [2022-03-20 13:31:43,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:43,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:31:43,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:43,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:31:43,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:43,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:31:43,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:43,872 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:31:43,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:44,355 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:44,356 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:31:44,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716326444] [2022-03-20 13:31:44,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [716326444] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:31:44,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135428955] [2022-03-20 13:31:44,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:31:44,356 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:31:44,356 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:31:44,357 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:31:44,359 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-20 13:31:44,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:31:44,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:31:44,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:31:45,703 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:45,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:31:49,671 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:31:49,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135428955] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:31:49,671 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:31:49,671 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 42 [2022-03-20 13:32:03,734 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:32:03,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1673681247] [2022-03-20 13:32:03,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1673681247] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:32:03,734 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:32:03,734 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 13:32:03,734 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33165954] [2022-03-20 13:32:03,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:32:03,735 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 13:32:03,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:32:03,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 13:32:03,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=2089, Unknown=6, NotChecked=0, Total=2352 [2022-03-20 13:32:03,739 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:32:08,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:32:08,861 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2022-03-20 13:32:08,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 13:32:08,863 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 37 [2022-03-20 13:32:08,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:32:08,863 INFO L225 Difference]: With dead ends: 71 [2022-03-20 13:32:08,863 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 13:32:08,865 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1296 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=391, Invalid=3384, Unknown=7, NotChecked=0, Total=3782 [2022-03-20 13:32:08,865 INFO L913 BasicCegarLoop]: 22 mSDtfsCounter, 46 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 80 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:32:08,865 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 90 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 394 Invalid, 0 Unknown, 80 Unchecked, 1.2s Time] [2022-03-20 13:32:08,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 13:32:08,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2022-03-20 13:32:08,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 49 states have internal predecessors, (52), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 13:32:08,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2022-03-20 13:32:08,880 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 37 [2022-03-20 13:32:08,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:32:08,880 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2022-03-20 13:32:08,880 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.45) internal successors, (29), 20 states have internal predecessors, (29), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:32:08,880 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2022-03-20 13:32:08,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:32:08,880 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:32:08,880 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1] [2022-03-20 13:32:08,898 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-20 13:32:09,098 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-03-20 13:32:09,099 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:32:09,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:32:09,100 INFO L85 PathProgramCache]: Analyzing trace with hash 606915741, now seen corresponding path program 4 times [2022-03-20 13:32:09,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:32:09,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1585921918] [2022-03-20 13:32:09,281 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:32:09,281 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:32:09,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1753442777, now seen corresponding path program 1 times [2022-03-20 13:32:09,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:32:09,282 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037034271] [2022-03-20 13:32:09,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:32:09,282 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:32:09,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:09,431 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:32:09,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:09,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:32:09,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:09,875 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:32:09,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:10,578 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:10,578 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:32:10,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037034271] [2022-03-20 13:32:10,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037034271] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:32:10,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102972420] [2022-03-20 13:32:10,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:32:10,578 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:32:10,579 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:32:10,580 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:32:10,581 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-20 13:32:10,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:10,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 13:32:10,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:32:11,797 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:11,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:32:17,216 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:17,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102972420] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:32:17,216 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:32:17,216 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 35 [2022-03-20 13:32:45,036 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:32:45,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1585921918] [2022-03-20 13:32:45,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1585921918] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:32:45,037 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:32:45,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-20 13:32:45,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407716164] [2022-03-20 13:32:45,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:32:45,037 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-20 13:32:45,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:32:45,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-20 13:32:45,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=1475, Unknown=9, NotChecked=0, Total=1722 [2022-03-20 13:32:45,038 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:32:51,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:32:51,481 INFO L93 Difference]: Finished difference Result 81 states and 90 transitions. [2022-03-20 13:32:51,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-20 13:32:51,485 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-03-20 13:32:51,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:32:51,485 INFO L225 Difference]: With dead ends: 81 [2022-03-20 13:32:51,485 INFO L226 Difference]: Without dead ends: 75 [2022-03-20 13:32:51,486 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 911 ImplicationChecksByTransitivity, 34.8s TimeCoverageRelationStatistics Valid=345, Invalid=2507, Unknown=10, NotChecked=0, Total=2862 [2022-03-20 13:32:51,487 INFO L913 BasicCegarLoop]: 23 mSDtfsCounter, 69 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 376 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 150 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:32:51,487 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 89 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 376 Invalid, 0 Unknown, 150 Unchecked, 1.1s Time] [2022-03-20 13:32:51,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-20 13:32:51,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2022-03-20 13:32:51,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 51 states have internal predecessors, (55), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 13:32:51,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2022-03-20 13:32:51,498 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 39 [2022-03-20 13:32:51,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:32:51,498 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2022-03-20 13:32:51,498 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 1.55) internal successors, (31), 20 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:32:51,498 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2022-03-20 13:32:51,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:32:51,499 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:32:51,499 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2022-03-20 13:32:51,515 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-20 13:32:51,703 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:32:51,704 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:32:51,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:32:51,704 INFO L85 PathProgramCache]: Analyzing trace with hash -1449963591, now seen corresponding path program 5 times [2022-03-20 13:32:51,704 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:32:51,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1990471837] [2022-03-20 13:32:51,836 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:32:51,836 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:32:51,836 INFO L85 PathProgramCache]: Analyzing trace with hash -163897243, now seen corresponding path program 1 times [2022-03-20 13:32:51,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:32:51,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1807396951] [2022-03-20 13:32:51,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:32:51,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:32:51,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:52,013 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:32:52,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:52,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:32:52,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:52,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:32:52,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:53,068 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:53,069 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:32:53,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1807396951] [2022-03-20 13:32:53,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1807396951] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:32:53,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590074225] [2022-03-20 13:32:53,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:32:53,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:32:53,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:32:53,070 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:32:53,071 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-20 13:32:53,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:32:53,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:32:53,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:32:54,609 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:54,609 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:32:58,953 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:32:58,953 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590074225] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:32:58,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:32:58,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 33 [2022-03-20 13:33:43,136 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:33:43,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1990471837] [2022-03-20 13:33:43,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1990471837] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:33:43,137 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:33:43,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 13:33:43,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660744577] [2022-03-20 13:33:43,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:33:43,137 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 13:33:43,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:33:43,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 13:33:43,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1466, Unknown=15, NotChecked=0, Total=1722 [2022-03-20 13:33:43,138 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:33:52,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:33:52,618 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2022-03-20 13:33:52,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 13:33:52,618 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-03-20 13:33:52,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:33:52,619 INFO L225 Difference]: With dead ends: 77 [2022-03-20 13:33:52,619 INFO L226 Difference]: Without dead ends: 68 [2022-03-20 13:33:52,621 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 53.5s TimeCoverageRelationStatistics Valid=352, Invalid=2493, Unknown=17, NotChecked=0, Total=2862 [2022-03-20 13:33:52,621 INFO L913 BasicCegarLoop]: 27 mSDtfsCounter, 57 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 497 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 117 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-20 13:33:52,621 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 103 Invalid, 497 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 363 Invalid, 0 Unknown, 117 Unchecked, 1.5s Time] [2022-03-20 13:33:52,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-03-20 13:33:52,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 63. [2022-03-20 13:33:52,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 48 states have (on average 1.1666666666666667) internal successors, (56), 52 states have internal predecessors, (56), 7 states have call successors, (7), 5 states have call predecessors, (7), 7 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-03-20 13:33:52,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-03-20 13:33:52,634 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 39 [2022-03-20 13:33:52,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:33:52,634 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-03-20 13:33:52,634 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:33:52,634 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-03-20 13:33:52,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-20 13:33:52,635 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:33:52,635 INFO L499 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1] [2022-03-20 13:33:52,656 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-20 13:33:52,856 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:33:52,857 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:33:52,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:33:52,857 INFO L85 PathProgramCache]: Analyzing trace with hash 2030931829, now seen corresponding path program 3 times [2022-03-20 13:33:52,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:33:52,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1333148667] [2022-03-20 13:33:53,077 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:33:53,077 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:33:53,078 INFO L85 PathProgramCache]: Analyzing trace with hash -775380895, now seen corresponding path program 1 times [2022-03-20 13:33:53,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:33:53,078 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19559495] [2022-03-20 13:33:53,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:33:53,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:33:53,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:33:53,239 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:33:53,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:33:53,244 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:33:53,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:33:53,720 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:33:53,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:33:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:33:54,706 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:33:54,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19559495] [2022-03-20 13:33:54,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19559495] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:33:54,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575655780] [2022-03-20 13:33:54,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:33:54,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:33:54,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:33:54,709 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:33:54,717 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-20 13:33:54,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:33:54,780 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2022-03-20 13:33:54,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:33:57,099 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:33:57,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:34:02,903 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:34:02,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575655780] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:34:02,903 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:34:02,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 42 [2022-03-20 13:34:27,815 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:34:27,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1333148667] [2022-03-20 13:34:27,815 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1333148667] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:34:27,815 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:34:27,815 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 13:34:27,815 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109808842] [2022-03-20 13:34:27,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:34:27,815 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 13:34:27,816 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:34:27,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 13:34:27,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=2261, Unknown=11, NotChecked=0, Total=2550 [2022-03-20 13:34:27,816 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:34:35,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:34:35,575 INFO L93 Difference]: Finished difference Result 69 states and 76 transitions. [2022-03-20 13:34:35,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 13:34:35,575 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 39 [2022-03-20 13:34:35,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:34:35,576 INFO L225 Difference]: With dead ends: 69 [2022-03-20 13:34:35,576 INFO L226 Difference]: Without dead ends: 54 [2022-03-20 13:34:35,577 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1404 ImplicationChecksByTransitivity, 37.3s TimeCoverageRelationStatistics Valid=410, Invalid=3609, Unknown=13, NotChecked=0, Total=4032 [2022-03-20 13:34:35,577 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 51 mSDsluCounter, 76 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 13:34:35,577 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 101 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 353 Invalid, 0 Unknown, 122 Unchecked, 1.4s Time] [2022-03-20 13:34:35,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2022-03-20 13:34:35,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2022-03-20 13:34:35,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 44 states have internal predecessors, (46), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:34:35,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2022-03-20 13:34:35,591 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 39 [2022-03-20 13:34:35,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:34:35,592 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2022-03-20 13:34:35,592 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:34:35,592 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2022-03-20 13:34:35,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 13:34:35,592 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:34:35,592 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 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, 1, 1, 1, 1] [2022-03-20 13:34:35,610 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-20 13:34:35,807 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-03-20 13:34:35,808 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:34:35,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:34:35,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1677214879, now seen corresponding path program 6 times [2022-03-20 13:34:35,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:34:35,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [588891617] [2022-03-20 13:34:35,951 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:34:35,951 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:34:35,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1046951017, now seen corresponding path program 1 times [2022-03-20 13:34:35,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:34:35,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420206454] [2022-03-20 13:34:35,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:34:35,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:34:35,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:34:36,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:34:36,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:34:36,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:34:36,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:34:36,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:34:36,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:34:37,697 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:34:37,697 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:34:37,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420206454] [2022-03-20 13:34:37,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420206454] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:34:37,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354114518] [2022-03-20 13:34:37,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:34:37,698 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:34:37,698 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:34:37,699 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:34:37,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-20 13:34:37,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:34:37,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 13:34:37,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:34:39,281 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:34:39,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:34:46,112 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:34:46,112 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354114518] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:34:46,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:34:46,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 37 [2022-03-20 13:35:14,026 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:35:14,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [588891617] [2022-03-20 13:35:14,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [588891617] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:35:14,026 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:35:14,026 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-20 13:35:14,026 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636239453] [2022-03-20 13:35:14,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:35:14,026 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-20 13:35:14,027 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:35:14,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-20 13:35:14,027 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=1629, Unknown=9, NotChecked=0, Total=1892 [2022-03-20 13:35:14,027 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:35:21,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:35:21,787 INFO L93 Difference]: Finished difference Result 69 states and 74 transitions. [2022-03-20 13:35:21,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-20 13:35:21,787 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2022-03-20 13:35:21,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:35:21,788 INFO L225 Difference]: With dead ends: 69 [2022-03-20 13:35:21,788 INFO L226 Difference]: Without dead ends: 63 [2022-03-20 13:35:21,789 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1009 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=374, Invalid=2808, Unknown=10, NotChecked=0, Total=3192 [2022-03-20 13:35:21,789 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 69 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-20 13:35:21,789 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 88 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 474 Invalid, 0 Unknown, 59 Unchecked, 1.7s Time] [2022-03-20 13:35:21,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-20 13:35:21,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2022-03-20 13:35:21,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 46 states have internal predecessors, (49), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:35:21,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2022-03-20 13:35:21,801 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 41 [2022-03-20 13:35:21,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:35:21,801 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2022-03-20 13:35:21,801 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:35:21,802 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2022-03-20 13:35:21,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-20 13:35:21,802 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:35:21,802 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:35:21,820 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-20 13:35:22,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-20 13:35:22,003 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:35:22,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:35:22,003 INFO L85 PathProgramCache]: Analyzing trace with hash 701132987, now seen corresponding path program 7 times [2022-03-20 13:35:22,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:35:22,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [892561617] [2022-03-20 13:35:22,229 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:35:22,230 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:35:22,230 INFO L85 PathProgramCache]: Analyzing trace with hash -393390297, now seen corresponding path program 1 times [2022-03-20 13:35:22,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:35:22,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [554450601] [2022-03-20 13:35:22,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:35:22,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:35:22,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:35:22,389 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:35:22,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:35:22,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:35:22,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:35:22,942 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:35:22,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:35:23,969 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:35:23,970 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:35:23,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [554450601] [2022-03-20 13:35:23,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [554450601] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:35:23,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1546353721] [2022-03-20 13:35:23,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:35:23,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:35:23,971 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:35:23,972 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:35:23,973 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-20 13:35:24,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:35:24,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 13:35:24,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:35:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:35:25,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:35:32,195 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:35:32,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1546353721] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:35:32,195 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:35:32,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 35 [2022-03-20 13:36:25,334 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:36:25,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [892561617] [2022-03-20 13:36:25,334 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [892561617] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:36:25,334 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:36:25,334 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 13:36:25,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336269789] [2022-03-20 13:36:25,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:36:25,335 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 13:36:25,335 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:25,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 13:36:25,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1616, Unknown=21, NotChecked=0, Total=1892 [2022-03-20 13:36:25,336 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand has 24 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:36:34,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:36:34,692 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2022-03-20 13:36:34,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 13:36:34,693 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2022-03-20 13:36:34,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:36:34,693 INFO L225 Difference]: With dead ends: 68 [2022-03-20 13:36:34,693 INFO L226 Difference]: Without dead ends: 58 [2022-03-20 13:36:34,694 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 986 ImplicationChecksByTransitivity, 64.5s TimeCoverageRelationStatistics Valid=365, Invalid=2692, Unknown=23, NotChecked=0, Total=3080 [2022-03-20 13:36:34,694 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 55 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 367 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 13:36:34,694 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 84 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 367 Invalid, 0 Unknown, 104 Unchecked, 1.4s Time] [2022-03-20 13:36:34,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-03-20 13:36:34,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2022-03-20 13:36:34,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:36:34,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2022-03-20 13:36:34,716 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 41 [2022-03-20 13:36:34,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:36:34,716 INFO L478 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2022-03-20 13:36:34,716 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.5) internal successors, (33), 22 states have internal predecessors, (33), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:36:34,717 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2022-03-20 13:36:34,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 13:36:34,717 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:36:34,717 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 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, 1, 1, 1, 1] [2022-03-20 13:36:34,734 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-20 13:36:34,934 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-03-20 13:36:34,934 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:36:34,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:36:34,934 INFO L85 PathProgramCache]: Analyzing trace with hash -557464543, now seen corresponding path program 8 times [2022-03-20 13:36:34,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:36:34,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1562780321] [2022-03-20 13:36:35,137 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:36:35,137 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:36:35,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1302071787, now seen corresponding path program 1 times [2022-03-20 13:36:35,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:36:35,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049959104] [2022-03-20 13:36:35,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:35,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:36:35,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:35,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:36:35,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:35,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:36:35,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:35,871 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:36:35,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:36,988 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:36,988 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:36:36,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049959104] [2022-03-20 13:36:36,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049959104] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:36:36,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1639759741] [2022-03-20 13:36:36,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:36:36,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:36:36,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:36:36,990 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:36:36,991 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-20 13:36:37,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:36:37,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 13:36:37,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:36:38,913 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:38,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:36:47,352 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:36:47,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1639759741] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:36:47,353 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:36:47,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 39 [2022-03-20 13:37:15,616 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:37:15,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1562780321] [2022-03-20 13:37:15,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1562780321] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:37:15,616 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:37:15,616 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-20 13:37:15,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756489568] [2022-03-20 13:37:15,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:37:15,617 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-20 13:37:15,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:37:15,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-20 13:37:15,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=1791, Unknown=9, NotChecked=0, Total=2070 [2022-03-20 13:37:15,618 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:37:24,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:37:24,412 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2022-03-20 13:37:24,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-20 13:37:24,412 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2022-03-20 13:37:24,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:37:24,413 INFO L225 Difference]: With dead ends: 71 [2022-03-20 13:37:24,413 INFO L226 Difference]: Without dead ends: 65 [2022-03-20 13:37:24,414 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1115 ImplicationChecksByTransitivity, 39.6s TimeCoverageRelationStatistics Valid=400, Invalid=3130, Unknown=10, NotChecked=0, Total=3540 [2022-03-20 13:37:24,414 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 68 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 560 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 159 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-03-20 13:37:24,414 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 108 Invalid, 744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 560 Invalid, 0 Unknown, 159 Unchecked, 2.2s Time] [2022-03-20 13:37:24,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-20 13:37:24,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2022-03-20 13:37:24,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.108695652173913) internal successors, (51), 48 states have internal predecessors, (51), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:37:24,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2022-03-20 13:37:24,438 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 43 [2022-03-20 13:37:24,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:37:24,438 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2022-03-20 13:37:24,438 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 22 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:37:24,438 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2022-03-20 13:37:24,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-20 13:37:24,438 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:37:24,438 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:37:24,456 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-20 13:37:24,649 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-03-20 13:37:24,650 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:37:24,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:37:24,650 INFO L85 PathProgramCache]: Analyzing trace with hash 2025675069, now seen corresponding path program 9 times [2022-03-20 13:37:24,650 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:37:24,650 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1251268388] [2022-03-20 13:37:24,792 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:37:24,792 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:37:24,793 INFO L85 PathProgramCache]: Analyzing trace with hash 978490665, now seen corresponding path program 1 times [2022-03-20 13:37:24,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:37:24,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445063905] [2022-03-20 13:37:24,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:37:24,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:37:24,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:37:24,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:37:24,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:37:24,961 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:37:24,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:37:25,546 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:37:25,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:37:26,633 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:37:26,633 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:37:26,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445063905] [2022-03-20 13:37:26,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445063905] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:37:26,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980235214] [2022-03-20 13:37:26,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:37:26,634 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:37:26,634 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:37:26,635 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:37:26,636 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-20 13:37:26,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:37:26,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-20 13:37:26,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:37:28,508 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:37:28,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:37:34,728 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:37:34,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980235214] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:37:34,729 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:37:34,729 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 37 [2022-03-20 13:38:21,593 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:38:21,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1251268388] [2022-03-20 13:38:21,593 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1251268388] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:38:21,593 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:38:21,594 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 13:38:21,594 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193055856] [2022-03-20 13:38:21,594 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:38:21,594 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 13:38:21,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:38:21,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 13:38:21,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1781, Unknown=18, NotChecked=0, Total=2070 [2022-03-20 13:38:21,595 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:38:37,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:38:37,287 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-03-20 13:38:37,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 13:38:37,288 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 43 [2022-03-20 13:38:37,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:38:37,288 INFO L225 Difference]: With dead ends: 70 [2022-03-20 13:38:37,288 INFO L226 Difference]: Without dead ends: 60 [2022-03-20 13:38:37,289 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1117 ImplicationChecksByTransitivity, 65.0s TimeCoverageRelationStatistics Valid=391, Invalid=3011, Unknown=20, NotChecked=0, Total=3422 [2022-03-20 13:38:37,289 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 55 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 499 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-03-20 13:38:37,290 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 104 Invalid, 499 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 338 Invalid, 0 Unknown, 141 Unchecked, 1.3s Time] [2022-03-20 13:38:37,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2022-03-20 13:38:37,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2022-03-20 13:38:37,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 48 states have internal predecessors, (50), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:38:37,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 62 transitions. [2022-03-20 13:38:37,315 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 62 transitions. Word has length 43 [2022-03-20 13:38:37,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:38:37,315 INFO L478 AbstractCegarLoop]: Abstraction has 58 states and 62 transitions. [2022-03-20 13:38:37,315 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.5217391304347827) internal successors, (35), 23 states have internal predecessors, (35), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:38:37,315 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 62 transitions. [2022-03-20 13:38:37,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 13:38:37,315 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:38:37,315 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 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, 1, 1, 1, 1] [2022-03-20 13:38:37,331 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-03-20 13:38:37,531 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-20 13:38:37,531 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:38:37,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:38:37,532 INFO L85 PathProgramCache]: Analyzing trace with hash -600741085, now seen corresponding path program 10 times [2022-03-20 13:38:37,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:38:37,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [452030742] [2022-03-20 13:38:37,695 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:38:37,695 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:38:37,696 INFO L85 PathProgramCache]: Analyzing trace with hash -630495507, now seen corresponding path program 1 times [2022-03-20 13:38:37,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:38:37,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213599816] [2022-03-20 13:38:37,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:38:37,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:38:37,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:38:37,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:38:37,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:38:37,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:38:37,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:38:38,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:38:38,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:38:39,751 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:38:39,751 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:38:39,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213599816] [2022-03-20 13:38:39,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213599816] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:38:39,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194209285] [2022-03-20 13:38:39,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:38:39,752 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:38:39,752 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:38:39,753 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:38:39,754 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-20 13:38:39,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:38:39,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 13:38:39,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:38:41,507 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:38:41,507 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:38:49,555 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:38:49,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194209285] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:38:49,555 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:38:49,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 41 [2022-03-20 13:39:15,299 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:39:15,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [452030742] [2022-03-20 13:39:15,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [452030742] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:39:15,299 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:39:15,299 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-20 13:39:15,299 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670390652] [2022-03-20 13:39:15,299 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:39:15,299 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-20 13:39:15,299 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:39:15,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-20 13:39:15,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=1963, Unknown=7, NotChecked=0, Total=2256 [2022-03-20 13:39:15,300 INFO L87 Difference]: Start difference. First operand 58 states and 62 transitions. Second operand has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:39:23,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:39:23,914 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2022-03-20 13:39:23,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-20 13:39:23,915 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2022-03-20 13:39:23,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:39:23,915 INFO L225 Difference]: With dead ends: 73 [2022-03-20 13:39:23,915 INFO L226 Difference]: Without dead ends: 67 [2022-03-20 13:39:23,916 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1227 ImplicationChecksByTransitivity, 36.8s TimeCoverageRelationStatistics Valid=426, Invalid=3472, Unknown=8, NotChecked=0, Total=3906 [2022-03-20 13:39:23,916 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 73 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 605 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 605 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 20 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:39:23,916 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 93 Invalid, 652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 605 Invalid, 0 Unknown, 20 Unchecked, 2.1s Time] [2022-03-20 13:39:23,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-20 13:39:23,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 60. [2022-03-20 13:39:23,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:39:23,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2022-03-20 13:39:23,933 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 45 [2022-03-20 13:39:23,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:39:23,934 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2022-03-20 13:39:23,934 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:39:23,934 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2022-03-20 13:39:23,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-20 13:39:23,934 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:39:23,934 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:39:23,952 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-20 13:39:24,147 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:39:24,147 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:39:24,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:39:24,148 INFO L85 PathProgramCache]: Analyzing trace with hash -694671041, now seen corresponding path program 11 times [2022-03-20 13:39:24,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:39:24,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1302400886] [2022-03-20 13:39:24,362 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:39:24,363 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:39:24,363 INFO L85 PathProgramCache]: Analyzing trace with hash -63817045, now seen corresponding path program 1 times [2022-03-20 13:39:24,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:39:24,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082616163] [2022-03-20 13:39:24,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:39:24,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:39:24,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:39:24,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:39:24,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:39:24,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:39:24,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:39:25,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:39:25,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:39:26,331 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:39:26,331 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:39:26,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082616163] [2022-03-20 13:39:26,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082616163] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:39:26,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [283742423] [2022-03-20 13:39:26,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:39:26,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:39:26,332 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:39:26,333 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:39:26,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-20 13:39:26,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:39:26,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-20 13:39:26,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:39:28,006 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:39:28,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:39:35,532 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:39:35,532 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [283742423] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:39:35,532 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:39:35,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 39 [2022-03-20 13:40:22,092 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:40:22,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1302400886] [2022-03-20 13:40:22,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1302400886] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:40:22,093 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:40:22,093 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 13:40:22,093 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085382508] [2022-03-20 13:40:22,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:40:22,093 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 13:40:22,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:40:22,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 13:40:22,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1951, Unknown=18, NotChecked=0, Total=2256 [2022-03-20 13:40:22,094 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:40:37,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:40:37,970 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-03-20 13:40:37,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 13:40:37,970 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 45 [2022-03-20 13:40:37,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:40:37,971 INFO L225 Difference]: With dead ends: 72 [2022-03-20 13:40:37,971 INFO L226 Difference]: Without dead ends: 62 [2022-03-20 13:40:37,972 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 66 SyntacticMatches, 4 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 65.2s TimeCoverageRelationStatistics Valid=417, Invalid=3345, Unknown=20, NotChecked=0, Total=3782 [2022-03-20 13:40:37,972 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 64 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 28 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-20 13:40:37,973 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 56 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 375 Invalid, 0 Unknown, 28 Unchecked, 1.4s Time] [2022-03-20 13:40:37,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-03-20 13:40:37,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2022-03-20 13:40:37,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 50 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:40:37,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-03-20 13:40:37,993 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 45 [2022-03-20 13:40:37,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:40:37,993 INFO L478 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-03-20 13:40:37,993 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 24 states have internal predecessors, (37), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:40:37,993 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-03-20 13:40:37,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 13:40:37,993 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:40:37,993 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 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, 1, 1, 1, 1] [2022-03-20 13:40:38,025 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-20 13:40:38,211 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:40:38,211 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:40:38,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:40:38,211 INFO L85 PathProgramCache]: Analyzing trace with hash 760175013, now seen corresponding path program 12 times [2022-03-20 13:40:38,211 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:40:38,211 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1220108940] [2022-03-20 13:40:38,433 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:40:38,433 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:40:38,434 INFO L85 PathProgramCache]: Analyzing trace with hash -245798033, now seen corresponding path program 1 times [2022-03-20 13:40:38,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:40:38,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694306390] [2022-03-20 13:40:38,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:40:38,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:40:38,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:40:38,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:40:38,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:40:38,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:40:38,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:40:39,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:40:39,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:40:40,650 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:40:40,650 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:40:40,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694306390] [2022-03-20 13:40:40,650 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694306390] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:40:40,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064552213] [2022-03-20 13:40:40,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:40:40,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:40:40,651 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:40:40,652 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:40:40,652 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-20 13:40:40,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:40:40,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 13:40:40,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:40:42,558 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:40:42,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:40:50,572 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:40:50,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064552213] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:40:50,572 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:40:50,572 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 43 [2022-03-20 13:41:14,446 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:41:14,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1220108940] [2022-03-20 13:41:14,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1220108940] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:41:14,447 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:41:14,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-20 13:41:14,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868736076] [2022-03-20 13:41:14,447 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:41:14,447 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-20 13:41:14,447 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:41:14,447 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-20 13:41:14,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=2141, Unknown=7, NotChecked=0, Total=2450 [2022-03-20 13:41:14,448 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:41:23,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:41:23,679 INFO L93 Difference]: Finished difference Result 75 states and 80 transitions. [2022-03-20 13:41:23,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-20 13:41:23,679 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2022-03-20 13:41:23,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:41:23,680 INFO L225 Difference]: With dead ends: 75 [2022-03-20 13:41:23,680 INFO L226 Difference]: Without dead ends: 69 [2022-03-20 13:41:23,681 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1340 ImplicationChecksByTransitivity, 36.0s TimeCoverageRelationStatistics Valid=452, Invalid=3830, Unknown=8, NotChecked=0, Total=4290 [2022-03-20 13:41:23,681 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 80 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 649 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 649 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 127 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-03-20 13:41:23,681 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 103 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 649 Invalid, 0 Unknown, 127 Unchecked, 2.3s Time] [2022-03-20 13:41:23,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-20 13:41:23,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 62. [2022-03-20 13:41:23,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.1) internal successors, (55), 52 states have internal predecessors, (55), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:41:23,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-03-20 13:41:23,705 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 47 [2022-03-20 13:41:23,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:41:23,706 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-03-20 13:41:23,706 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 24 states have (on average 1.625) internal successors, (39), 24 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:41:23,706 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-03-20 13:41:23,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-20 13:41:23,706 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:41:23,706 INFO L499 BasicCegarLoop]: trace histogram [7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:41:23,729 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-20 13:41:23,922 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:41:23,923 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:41:23,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:41:23,923 INFO L85 PathProgramCache]: Analyzing trace with hash 687800513, now seen corresponding path program 13 times [2022-03-20 13:41:23,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:41:23,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [996374646] [2022-03-20 13:41:24,074 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:41:24,074 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:41:24,075 INFO L85 PathProgramCache]: Analyzing trace with hash 1010329517, now seen corresponding path program 1 times [2022-03-20 13:41:24,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:41:24,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358793056] [2022-03-20 13:41:24,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:41:24,075 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:41:24,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:41:24,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:41:24,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:41:24,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:41:24,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:41:24,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:41:24,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:41:26,259 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:41:26,259 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:41:26,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358793056] [2022-03-20 13:41:26,259 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358793056] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:41:26,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215949797] [2022-03-20 13:41:26,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:41:26,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:41:26,260 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:41:26,262 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:41:26,263 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-20 13:41:26,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:41:26,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-20 13:41:26,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:41:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:41:28,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:41:36,510 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:41:36,510 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215949797] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:41:36,510 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:41:36,510 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 19] total 41 [2022-03-20 13:42:25,470 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:42:25,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [996374646] [2022-03-20 13:42:25,471 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [996374646] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:42:25,471 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:42:25,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 13:42:25,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985329002] [2022-03-20 13:42:25,471 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:42:25,471 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 13:42:25,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:42:25,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 13:42:25,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=2128, Unknown=18, NotChecked=0, Total=2450 [2022-03-20 13:42:25,472 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:42:36,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:42:36,575 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-03-20 13:42:36,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 13:42:36,576 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 47 [2022-03-20 13:42:36,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:42:36,577 INFO L225 Difference]: With dead ends: 74 [2022-03-20 13:42:36,577 INFO L226 Difference]: Without dead ends: 64 [2022-03-20 13:42:36,577 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 62.9s TimeCoverageRelationStatistics Valid=441, Invalid=3699, Unknown=20, NotChecked=0, Total=4160 [2022-03-20 13:42:36,578 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 54 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 153 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-03-20 13:42:36,578 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 114 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 506 Invalid, 0 Unknown, 153 Unchecked, 2.1s Time] [2022-03-20 13:42:36,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-03-20 13:42:36,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2022-03-20 13:42:36,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.08) internal successors, (54), 52 states have internal predecessors, (54), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:42:36,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2022-03-20 13:42:36,602 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 47 [2022-03-20 13:42:36,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:42:36,602 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2022-03-20 13:42:36,603 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:42:36,604 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2022-03-20 13:42:36,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 13:42:36,605 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:42:36,605 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 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, 1, 1, 1, 1] [2022-03-20 13:42:36,624 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-20 13:42:36,814 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-03-20 13:42:36,814 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:42:36,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:42:36,815 INFO L85 PathProgramCache]: Analyzing trace with hash -1364480089, now seen corresponding path program 14 times [2022-03-20 13:42:36,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:42:36,815 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [978611012] [2022-03-20 13:42:36,972 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:42:36,972 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:42:36,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1818376049, now seen corresponding path program 1 times [2022-03-20 13:42:36,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:42:36,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004212892] [2022-03-20 13:42:36,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:42:36,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:42:36,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:42:37,146 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:42:37,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:42:37,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:42:37,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:42:37,758 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:42:37,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:42:39,696 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:42:39,696 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:42:39,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004212892] [2022-03-20 13:42:39,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004212892] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:42:39,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134794955] [2022-03-20 13:42:39,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:42:39,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:42:39,697 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:42:39,698 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:42:39,700 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-20 13:42:39,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:42:39,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 13:42:39,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:42:42,001 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:42:42,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:42:53,216 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:42:53,217 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134794955] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:42:53,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:42:53,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 45 [2022-03-20 13:43:15,340 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:43:15,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [978611012] [2022-03-20 13:43:15,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [978611012] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:43:15,340 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:43:15,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-20 13:43:15,340 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278461958] [2022-03-20 13:43:15,340 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:43:15,341 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-20 13:43:15,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:43:15,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-20 13:43:15,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=2327, Unknown=7, NotChecked=0, Total=2652 [2022-03-20 13:43:15,341 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:43:25,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:43:25,646 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2022-03-20 13:43:25,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-20 13:43:25,647 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2022-03-20 13:43:25,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:43:25,647 INFO L225 Difference]: With dead ends: 77 [2022-03-20 13:43:25,647 INFO L226 Difference]: Without dead ends: 71 [2022-03-20 13:43:25,648 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1457 ImplicationChecksByTransitivity, 36.8s TimeCoverageRelationStatistics Valid=478, Invalid=4206, Unknown=8, NotChecked=0, Total=4692 [2022-03-20 13:43:25,648 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 77 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 763 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 860 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 66 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-03-20 13:43:25,649 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 103 Invalid, 860 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 763 Invalid, 0 Unknown, 66 Unchecked, 2.9s Time] [2022-03-20 13:43:25,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-20 13:43:25,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 64. [2022-03-20 13:43:25,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 54 states have internal predecessors, (57), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:43:25,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2022-03-20 13:43:25,683 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 49 [2022-03-20 13:43:25,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:43:25,683 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2022-03-20 13:43:25,683 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:43:25,683 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2022-03-20 13:43:25,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-20 13:43:25,688 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:43:25,688 INFO L499 BasicCegarLoop]: trace histogram [8, 8, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:43:25,706 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-20 13:43:25,904 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:43:25,904 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:43:25,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:43:25,904 INFO L85 PathProgramCache]: Analyzing trace with hash 2098069443, now seen corresponding path program 15 times [2022-03-20 13:43:25,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:43:25,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [58158353] [2022-03-20 13:43:26,050 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:43:26,050 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:43:26,050 INFO L85 PathProgramCache]: Analyzing trace with hash 334052399, now seen corresponding path program 1 times [2022-03-20 13:43:26,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:43:26,050 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648731676] [2022-03-20 13:43:26,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:43:26,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:43:26,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:43:26,210 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:43:26,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:43:26,212 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:43:26,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:43:26,769 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:43:26,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:43:28,302 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:43:28,303 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:43:28,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648731676] [2022-03-20 13:43:28,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648731676] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:43:28,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742746769] [2022-03-20 13:43:28,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:43:28,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:43:28,303 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:43:28,312 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:43:28,313 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-20 13:43:28,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:43:28,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-20 13:43:28,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:43:30,208 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:43:30,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:43:40,475 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:43:40,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742746769] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:43:40,476 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:43:40,476 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 43 [2022-03-20 13:44:29,036 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:44:29,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [58158353] [2022-03-20 13:44:29,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [58158353] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:44:29,037 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:44:29,037 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 13:44:29,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922607112] [2022-03-20 13:44:29,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:44:29,037 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 13:44:29,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:44:29,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 13:44:29,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=318, Invalid=2316, Unknown=18, NotChecked=0, Total=2652 [2022-03-20 13:44:29,038 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:44:39,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:44:39,685 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-03-20 13:44:39,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 13:44:39,686 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 49 [2022-03-20 13:44:39,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:44:39,686 INFO L225 Difference]: With dead ends: 76 [2022-03-20 13:44:39,686 INFO L226 Difference]: Without dead ends: 66 [2022-03-20 13:44:39,687 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 72 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1444 ImplicationChecksByTransitivity, 62.4s TimeCoverageRelationStatistics Valid=468, Invalid=4068, Unknown=20, NotChecked=0, Total=4556 [2022-03-20 13:44:39,687 INFO L913 BasicCegarLoop]: 25 mSDtfsCounter, 68 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 522 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-03-20 13:44:39,688 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 86 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 522 Invalid, 0 Unknown, 60 Unchecked, 1.8s Time] [2022-03-20 13:44:39,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-03-20 13:44:39,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2022-03-20 13:44:39,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 54 states have internal predecessors, (56), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:44:39,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2022-03-20 13:44:39,707 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 49 [2022-03-20 13:44:39,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:44:39,707 INFO L478 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2022-03-20 13:44:39,707 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:44:39,707 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2022-03-20 13:44:39,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 13:44:39,707 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:44:39,707 INFO L499 BasicCegarLoop]: trace histogram [10, 10, 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, 1, 1, 1, 1] [2022-03-20 13:44:39,733 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-20 13:44:39,909 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:44:39,910 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:44:39,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:44:39,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1246399785, now seen corresponding path program 16 times [2022-03-20 13:44:39,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:44:39,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1933738499] [2022-03-20 13:44:40,053 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:44:40,054 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:44:40,054 INFO L85 PathProgramCache]: Analyzing trace with hash -184947981, now seen corresponding path program 1 times [2022-03-20 13:44:40,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:44:40,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244096492] [2022-03-20 13:44:40,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:44:40,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:44:40,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:44:40,214 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:44:40,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:44:40,217 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:44:40,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:44:40,764 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:44:40,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:44:42,640 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:44:42,640 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:44:42,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244096492] [2022-03-20 13:44:42,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244096492] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:44:42,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963417019] [2022-03-20 13:44:42,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:44:42,641 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:44:42,641 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:44:42,642 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:44:42,646 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-20 13:44:42,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:44:42,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-20 13:44:42,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:44:44,670 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:44:44,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 13:44:56,058 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:44:56,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963417019] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 13:44:56,059 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 13:44:56,059 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 47 [2022-03-20 13:45:22,452 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 13:45:22,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1933738499] [2022-03-20 13:45:22,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1933738499] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 13:45:22,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 13:45:22,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-20 13:45:22,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228351967] [2022-03-20 13:45:22,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 13:45:22,453 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-20 13:45:22,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 13:45:22,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-20 13:45:22,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=2521, Unknown=7, NotChecked=0, Total=2862 [2022-03-20 13:45:22,454 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:45:32,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 13:45:32,586 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2022-03-20 13:45:32,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-20 13:45:32,587 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2022-03-20 13:45:32,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 13:45:32,587 INFO L225 Difference]: With dead ends: 79 [2022-03-20 13:45:32,587 INFO L226 Difference]: Without dead ends: 73 [2022-03-20 13:45:32,588 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1585 ImplicationChecksByTransitivity, 40.1s TimeCoverageRelationStatistics Valid=501, Invalid=4603, Unknown=8, NotChecked=0, Total=5112 [2022-03-20 13:45:32,588 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 76 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 711 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 177 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-03-20 13:45:32,588 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 103 Invalid, 921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 711 Invalid, 0 Unknown, 177 Unchecked, 2.5s Time] [2022-03-20 13:45:32,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-20 13:45:32,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2022-03-20 13:45:32,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 56 states have internal predecessors, (59), 6 states have call successors, (6), 5 states have call predecessors, (6), 5 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-03-20 13:45:32,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2022-03-20 13:45:32,608 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 51 [2022-03-20 13:45:32,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 13:45:32,608 INFO L478 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2022-03-20 13:45:32,609 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-03-20 13:45:32,609 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2022-03-20 13:45:32,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-20 13:45:32,609 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 13:45:32,609 INFO L499 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-20 13:45:32,625 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-20 13:45:32,810 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:45:32,810 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 13:45:32,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 13:45:32,816 INFO L85 PathProgramCache]: Analyzing trace with hash 156845637, now seen corresponding path program 17 times [2022-03-20 13:45:32,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 13:45:32,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [149453655] [2022-03-20 13:45:32,989 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-03-20 13:45:32,989 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-20 13:45:32,990 INFO L85 PathProgramCache]: Analyzing trace with hash 708892721, now seen corresponding path program 1 times [2022-03-20 13:45:32,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 13:45:32,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526579369] [2022-03-20 13:45:32,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:45:32,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 13:45:32,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:45:33,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 13:45:33,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:45:33,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2022-03-20 13:45:33,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:45:33,718 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 13:45:33,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:45:35,411 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:45:35,412 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 13:45:35,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526579369] [2022-03-20 13:45:35,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526579369] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 13:45:35,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115754601] [2022-03-20 13:45:35,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 13:45:35,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 13:45:35,412 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 13:45:35,413 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-20 13:45:35,414 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-20 13:45:35,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 13:45:35,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 35 conjunts are in the unsatisfiable core [2022-03-20 13:45:35,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 13:45:37,415 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 13:45:37,415 INFO L328 TraceCheckSpWp]: Computing backward predicates...