/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/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 07:36:06,448 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 07:36:06,449 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 07:36:06,486 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-03-19 07:36:06,524 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 07:36:06,531 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 07:36:06,532 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 07:36:06,533 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 07:36:06,533 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 07:36:06,534 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 07:36:06,534 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 07:36:06,534 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 07:36:06,534 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 07:36:06,534 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 07:36:06,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 07:36:06,535 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 07:36:06,535 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 07:36:06,535 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 07:36:06,734 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 07:36:06,760 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 07:36:06,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 07:36:06,762 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 07:36:06,764 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 07:36:06,765 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2022-03-19 07:36:06,816 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb7c9e379/0e1c44b3f41d4b3abcfff5f2e83bcdb4/FLAG7a7660081 [2022-03-19 07:36:07,161 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 07:36:07,162 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c [2022-03-19 07:36:07,166 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb7c9e379/0e1c44b3f41d4b3abcfff5f2e83bcdb4/FLAG7a7660081 [2022-03-19 07:36:07,174 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fb7c9e379/0e1c44b3f41d4b3abcfff5f2e83bcdb4 [2022-03-19 07:36:07,176 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 07:36:07,178 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 07:36:07,191 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 07:36:07,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 07:36:07,194 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 07:36:07,195 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,195 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3396722 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07, skipping insertion in model container [2022-03-19 07:36:07,195 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,200 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 07:36:07,210 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 07:36:07,308 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c[322,335] [2022-03-19 07:36:07,327 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 07:36:07,338 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 07:36:07,345 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-1.c[322,335] [2022-03-19 07:36:07,347 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 07:36:07,355 INFO L208 MainTranslator]: Completed translation [2022-03-19 07:36:07,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07 WrapperNode [2022-03-19 07:36:07,355 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 07:36:07,356 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 07:36:07,356 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 07:36:07,356 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 07:36:07,366 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,366 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,370 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,370 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,377 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,379 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,380 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,381 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 07:36:07,381 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 07:36:07,381 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 07:36:07,381 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 07:36:07,383 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (1/1) ... [2022-03-19 07:36:07,391 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 07:36:07,400 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:07,412 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) [2022-03-19 07:36:07,426 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 [2022-03-19 07:36:07,459 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 07:36:07,460 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 07:36:07,460 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 07:36:07,460 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 07:36:07,460 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 07:36:07,460 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 07:36:07,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 07:36:07,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 07:36:07,461 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 07:36:07,461 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 07:36:07,461 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 07:36:07,505 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 07:36:07,508 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 07:36:07,562 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 07:36:07,566 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 07:36:07,566 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-19 07:36:07,568 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 07:36:07 BoogieIcfgContainer [2022-03-19 07:36:07,568 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 07:36:07,569 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 07:36:07,569 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 07:36:07,571 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 07:36:07,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 07:36:07" (1/3) ... [2022-03-19 07:36:07,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@437f26e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 07:36:07, skipping insertion in model container [2022-03-19 07:36:07,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 07:36:07" (2/3) ... [2022-03-19 07:36:07,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@437f26e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 07:36:07, skipping insertion in model container [2022-03-19 07:36:07,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 07:36:07" (3/3) ... [2022-03-19 07:36:07,573 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_4-1.c [2022-03-19 07:36:07,577 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 07:36:07,577 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 07:36:07,629 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 07:36:07,634 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 [2022-03-19 07:36:07,634 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 07:36:07,676 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-03-19 07:36:07,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-19 07:36:07,681 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:07,682 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:07,682 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:07,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:07,686 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2022-03-19 07:36:07,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:07,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1126086810] [2022-03-19 07:36:07,700 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 07:36:07,700 INFO L85 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 2 times [2022-03-19 07:36:07,702 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:07,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914054417] [2022-03-19 07:36:07,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:07,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:07,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:07,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:07,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:07,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:07,849 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:07,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914054417] [2022-03-19 07:36:07,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914054417] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:07,850 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:07,850 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 07:36:07,852 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:07,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1126086810] [2022-03-19 07:36:07,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1126086810] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:07,852 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:07,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 07:36:07,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928581086] [2022-03-19 07:36:07,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:07,856 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 07:36:07,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:07,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 07:36:07,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 07:36:07,885 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:07,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:07,934 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2022-03-19 07:36:07,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 07:36:07,942 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-19 07:36:07,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:07,954 INFO L225 Difference]: With dead ends: 29 [2022-03-19 07:36:07,954 INFO L226 Difference]: Without dead ends: 12 [2022-03-19 07:36:07,957 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 07:36:07,959 INFO L912 BasicCegarLoop]: 17 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:07,960 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 20 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:07,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-03-19 07:36:07,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-03-19 07:36:07,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:07,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2022-03-19 07:36:07,986 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2022-03-19 07:36:07,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:07,987 INFO L478 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2022-03-19 07:36:07,987 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:07,987 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2022-03-19 07:36:07,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-19 07:36:07,988 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:07,988 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:07,988 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 07:36:07,988 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:07,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:07,989 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2022-03-19 07:36:07,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:07,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1480546965] [2022-03-19 07:36:07,990 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 07:36:07,990 INFO L85 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 2 times [2022-03-19 07:36:07,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:07,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109926053] [2022-03-19 07:36:07,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:07,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:08,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:08,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:08,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:08,094 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:08,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109926053] [2022-03-19 07:36:08,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109926053] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:08,096 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:08,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 07:36:08,096 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:08,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1480546965] [2022-03-19 07:36:08,096 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1480546965] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:08,096 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:08,096 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 07:36:08,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92794418] [2022-03-19 07:36:08,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:08,097 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 07:36:08,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:08,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 07:36:08,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 07:36:08,098 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:08,128 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2022-03-19 07:36:08,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 07:36:08,129 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-03-19 07:36:08,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:08,130 INFO L225 Difference]: With dead ends: 18 [2022-03-19 07:36:08,130 INFO L226 Difference]: Without dead ends: 13 [2022-03-19 07:36:08,130 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-03-19 07:36:08,133 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:08,133 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:08,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-19 07:36:08,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-19 07:36:08,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-03-19 07:36:08,144 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-03-19 07:36:08,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:08,144 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-03-19 07:36:08,144 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,145 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-03-19 07:36:08,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-03-19 07:36:08,145 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:08,145 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:08,145 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 07:36:08,145 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:08,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:08,146 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2022-03-19 07:36:08,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:08,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1473977835] [2022-03-19 07:36:08,250 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:08,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1867307785, now seen corresponding path program 1 times [2022-03-19 07:36:08,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:08,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578020188] [2022-03-19 07:36:08,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:08,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:08,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:08,277 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:08,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:08,301 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:08,302 INFO L85 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 2 times [2022-03-19 07:36:08,302 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:08,302 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167070714] [2022-03-19 07:36:08,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:08,302 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:08,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:08,349 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:08,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:08,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:08,360 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:08,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167070714] [2022-03-19 07:36:08,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167070714] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:08,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594340175] [2022-03-19 07:36:08,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:08,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:08,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:08,364 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) [2022-03-19 07:36:08,368 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 07:36:08,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:08,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:08,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 07:36:08,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:08,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:08,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:08,632 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:08,632 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [594340175] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:08,632 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:08,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 7] total 11 [2022-03-19 07:36:08,633 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:08,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1473977835] [2022-03-19 07:36:08,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1473977835] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:08,633 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:08,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 07:36:08,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936499201] [2022-03-19 07:36:08,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:08,634 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 07:36:08,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:08,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 07:36:08,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2022-03-19 07:36:08,635 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:08,677 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2022-03-19 07:36:08,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 07:36:08,678 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2022-03-19 07:36:08,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:08,678 INFO L225 Difference]: With dead ends: 19 [2022-03-19 07:36:08,678 INFO L226 Difference]: Without dead ends: 14 [2022-03-19 07:36:08,680 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2022-03-19 07:36:08,684 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:08,688 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:08,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-03-19 07:36:08,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-03-19 07:36:08,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2022-03-19 07:36:08,693 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2022-03-19 07:36:08,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:08,694 INFO L478 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2022-03-19 07:36:08,694 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:08,694 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2022-03-19 07:36:08,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-19 07:36:08,694 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:08,694 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:08,716 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:08,914 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:08,914 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:08,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:08,915 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 3 times [2022-03-19 07:36:08,915 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:08,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1218871000] [2022-03-19 07:36:08,955 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:08,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1808202441, now seen corresponding path program 1 times [2022-03-19 07:36:08,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:08,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400569798] [2022-03-19 07:36:08,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:08,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:08,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:08,985 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:08,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:08,996 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:08,997 INFO L85 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 4 times [2022-03-19 07:36:08,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:08,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1016208653] [2022-03-19 07:36:08,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:08,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:09,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:09,071 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:09,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:09,084 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,084 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:09,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1016208653] [2022-03-19 07:36:09,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1016208653] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:09,084 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190775551] [2022-03-19 07:36:09,084 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:09,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:09,085 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:09,086 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) [2022-03-19 07:36:09,087 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 07:36:09,114 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:09,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:09,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2022-03-19 07:36:09,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:09,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:09,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190775551] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:09,224 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:09,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 10 [2022-03-19 07:36:09,225 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:09,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1218871000] [2022-03-19 07:36:09,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1218871000] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:09,225 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:09,225 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 07:36:09,225 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508512103] [2022-03-19 07:36:09,225 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:09,226 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 07:36:09,226 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:09,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 07:36:09,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2022-03-19 07:36:09,227 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:09,280 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2022-03-19 07:36:09,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 07:36:09,280 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2022-03-19 07:36:09,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:09,281 INFO L225 Difference]: With dead ends: 20 [2022-03-19 07:36:09,281 INFO L226 Difference]: Without dead ends: 15 [2022-03-19 07:36:09,281 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=99, Unknown=0, NotChecked=0, Total=156 [2022-03-19 07:36:09,283 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:09,284 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:09,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-19 07:36:09,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-19 07:36:09,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-03-19 07:36:09,289 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2022-03-19 07:36:09,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:09,289 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-03-19 07:36:09,289 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,289 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-03-19 07:36:09,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-03-19 07:36:09,290 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:09,290 INFO L500 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:09,310 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:09,499 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-03-19 07:36:09,500 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:09,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:09,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 5 times [2022-03-19 07:36:09,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:09,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [181569087] [2022-03-19 07:36:09,534 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:09,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1749097097, now seen corresponding path program 1 times [2022-03-19 07:36:09,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:09,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432492968] [2022-03-19 07:36:09,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:09,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:09,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:09,544 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:09,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:09,554 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:09,554 INFO L85 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 6 times [2022-03-19 07:36:09,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:09,554 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183913552] [2022-03-19 07:36:09,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:09,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:09,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:09,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:09,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:09,622 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,622 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:09,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183913552] [2022-03-19 07:36:09,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183913552] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:09,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [313089190] [2022-03-19 07:36:09,623 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:09,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:09,623 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:09,624 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) [2022-03-19 07:36:09,625 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 07:36:09,650 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-03-19 07:36:09,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:09,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 07:36:09,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:09,689 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:09,824 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:09,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [313089190] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:09,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:09,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 9] total 15 [2022-03-19 07:36:09,824 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:09,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [181569087] [2022-03-19 07:36:09,824 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [181569087] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:09,824 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:09,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-19 07:36:09,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322200135] [2022-03-19 07:36:09,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:09,825 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-19 07:36:09,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:09,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-19 07:36:09,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2022-03-19 07:36:09,825 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:09,883 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2022-03-19 07:36:09,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 07:36:09,883 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-03-19 07:36:09,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:09,884 INFO L225 Difference]: With dead ends: 21 [2022-03-19 07:36:09,884 INFO L226 Difference]: Without dead ends: 16 [2022-03-19 07:36:09,884 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=249, Unknown=0, NotChecked=0, Total=342 [2022-03-19 07:36:09,885 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:09,885 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:09,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-03-19 07:36:09,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-03-19 07:36:09,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2022-03-19 07:36:09,887 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2022-03-19 07:36:09,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:09,887 INFO L478 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2022-03-19 07:36:09,888 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:09,888 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2022-03-19 07:36:09,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-19 07:36:09,888 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:09,888 INFO L500 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:09,907 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:10,101 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,SelfDestructingSolverStorable6,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:10,102 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:10,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:10,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 7 times [2022-03-19 07:36:10,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:10,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2032811751] [2022-03-19 07:36:10,129 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:10,129 INFO L85 PathProgramCache]: Analyzing trace with hash -1689991753, now seen corresponding path program 1 times [2022-03-19 07:36:10,130 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:10,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1029483795] [2022-03-19 07:36:10,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:10,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:10,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:10,138 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:10,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:10,145 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:10,146 INFO L85 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 8 times [2022-03-19 07:36:10,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:10,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811014804] [2022-03-19 07:36:10,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:10,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:10,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:10,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:10,226 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:10,226 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:10,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811014804] [2022-03-19 07:36:10,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [811014804] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:10,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918159971] [2022-03-19 07:36:10,227 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:10,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:10,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:10,228 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) [2022-03-19 07:36:10,254 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 07:36:10,261 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:10,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:10,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-19 07:36:10,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:10,310 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:10,310 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:10,582 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:10,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918159971] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:10,583 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:10,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 10] total 17 [2022-03-19 07:36:10,583 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:10,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2032811751] [2022-03-19 07:36:10,583 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2032811751] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:10,583 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:10,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 07:36:10,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110846688] [2022-03-19 07:36:10,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:10,584 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 07:36:10,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:10,584 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 07:36:10,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2022-03-19 07:36:10,584 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:10,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:10,656 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2022-03-19 07:36:10,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 07:36:10,657 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-03-19 07:36:10,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:10,657 INFO L225 Difference]: With dead ends: 22 [2022-03-19 07:36:10,657 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 07:36:10,658 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2022-03-19 07:36:10,658 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:10,658 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:10,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 07:36:10,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 07:36:10,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:10,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2022-03-19 07:36:10,661 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2022-03-19 07:36:10,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:10,661 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2022-03-19 07:36:10,661 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:10,661 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2022-03-19 07:36:10,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-03-19 07:36:10,661 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:10,661 INFO L500 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:10,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:10,867 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:10,868 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:10,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:10,868 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 9 times [2022-03-19 07:36:10,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:10,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [452987201] [2022-03-19 07:36:10,898 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:10,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1630886409, now seen corresponding path program 1 times [2022-03-19 07:36:10,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:10,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706269434] [2022-03-19 07:36:10,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:10,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:10,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:10,906 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:10,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:10,912 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:10,913 INFO L85 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 10 times [2022-03-19 07:36:10,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:10,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379235081] [2022-03-19 07:36:10,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:10,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:10,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:10,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:10,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:10,989 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:10,989 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:10,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379235081] [2022-03-19 07:36:10,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379235081] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:10,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976982621] [2022-03-19 07:36:10,989 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:10,989 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:10,989 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:10,990 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) [2022-03-19 07:36:10,992 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 07:36:11,015 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:11,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:11,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2022-03-19 07:36:11,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:11,076 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:11,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:11,189 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:11,189 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976982621] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:11,189 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:11,189 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 16 [2022-03-19 07:36:11,190 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:11,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [452987201] [2022-03-19 07:36:11,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [452987201] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:11,190 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:11,190 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 07:36:11,190 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063969260] [2022-03-19 07:36:11,190 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:11,190 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 07:36:11,190 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:11,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 07:36:11,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=163, Unknown=0, NotChecked=0, Total=240 [2022-03-19 07:36:11,191 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:11,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:11,280 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2022-03-19 07:36:11,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 07:36:11,281 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2022-03-19 07:36:11,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:11,282 INFO L225 Difference]: With dead ends: 23 [2022-03-19 07:36:11,282 INFO L226 Difference]: Without dead ends: 18 [2022-03-19 07:36:11,282 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=147, Invalid=315, Unknown=0, NotChecked=0, Total=462 [2022-03-19 07:36:11,282 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:11,283 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:11,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-03-19 07:36:11,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-03-19 07:36:11,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:11,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2022-03-19 07:36:11,285 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2022-03-19 07:36:11,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:11,285 INFO L478 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2022-03-19 07:36:11,285 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:11,285 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2022-03-19 07:36:11,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 07:36:11,286 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:11,286 INFO L500 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:11,307 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:11,493 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,SelfDestructingSolverStorable11 [2022-03-19 07:36:11,493 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:11,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:11,494 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 11 times [2022-03-19 07:36:11,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:11,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [259444162] [2022-03-19 07:36:11,520 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:11,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1571781065, now seen corresponding path program 1 times [2022-03-19 07:36:11,520 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:11,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818052235] [2022-03-19 07:36:11,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:11,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:11,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:11,527 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:11,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:11,533 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:11,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 12 times [2022-03-19 07:36:11,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:11,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120815631] [2022-03-19 07:36:11,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:11,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:11,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:11,603 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:11,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:11,612 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:11,612 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120815631] [2022-03-19 07:36:11,612 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120815631] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:11,612 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778578225] [2022-03-19 07:36:11,612 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:11,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:11,612 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:11,613 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) [2022-03-19 07:36:11,614 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 07:36:11,656 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 07:36:11,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:11,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 18 conjunts are in the unsatisfiable core [2022-03-19 07:36:11,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:11,702 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:11,702 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:11,911 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:11,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778578225] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:11,911 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:11,911 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 12] total 21 [2022-03-19 07:36:11,911 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:11,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [259444162] [2022-03-19 07:36:11,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [259444162] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:11,911 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:11,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 07:36:11,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367518490] [2022-03-19 07:36:11,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:11,912 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 07:36:11,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:11,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 07:36:11,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=311, Unknown=0, NotChecked=0, Total=420 [2022-03-19 07:36:11,912 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:12,017 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2022-03-19 07:36:12,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 07:36:12,018 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-03-19 07:36:12,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:12,018 INFO L225 Difference]: With dead ends: 24 [2022-03-19 07:36:12,018 INFO L226 Difference]: Without dead ends: 19 [2022-03-19 07:36:12,019 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=198, Invalid=558, Unknown=0, NotChecked=0, Total=756 [2022-03-19 07:36:12,019 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:12,019 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 28 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:12,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-19 07:36:12,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-19 07:36:12,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2022-03-19 07:36:12,022 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2022-03-19 07:36:12,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:12,022 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2022-03-19 07:36:12,022 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,022 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2022-03-19 07:36:12,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-03-19 07:36:12,022 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:12,022 INFO L500 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:12,028 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:12,226 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:12,227 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:12,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:12,227 INFO L85 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 13 times [2022-03-19 07:36:12,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:12,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [294785312] [2022-03-19 07:36:12,251 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:12,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1512675721, now seen corresponding path program 1 times [2022-03-19 07:36:12,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:12,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [961620404] [2022-03-19 07:36:12,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:12,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:12,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:12,256 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:12,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:12,261 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:12,261 INFO L85 PathProgramCache]: Analyzing trace with hash -76826442, now seen corresponding path program 14 times [2022-03-19 07:36:12,261 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:12,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793255010] [2022-03-19 07:36:12,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:12,261 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:12,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:12,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:12,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:12,354 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:12,354 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:12,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793255010] [2022-03-19 07:36:12,355 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [793255010] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:12,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054953480] [2022-03-19 07:36:12,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:12,355 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:12,355 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:12,356 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) [2022-03-19 07:36:12,357 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 07:36:12,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:12,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:12,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 20 conjunts are in the unsatisfiable core [2022-03-19 07:36:12,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:12,434 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:12,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:12,691 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:12,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054953480] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:12,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:12,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-03-19 07:36:12,692 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:12,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [294785312] [2022-03-19 07:36:12,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [294785312] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:12,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:12,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 07:36:12,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888339353] [2022-03-19 07:36:12,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:12,692 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 07:36:12,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:12,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 07:36:12,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=375, Unknown=0, NotChecked=0, Total=506 [2022-03-19 07:36:12,693 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:12,795 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2022-03-19 07:36:12,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 07:36:12,795 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-03-19 07:36:12,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:12,796 INFO L225 Difference]: With dead ends: 25 [2022-03-19 07:36:12,796 INFO L226 Difference]: Without dead ends: 20 [2022-03-19 07:36:12,796 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=241, Invalid=689, Unknown=0, NotChecked=0, Total=930 [2022-03-19 07:36:12,797 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:12,797 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:12,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-03-19 07:36:12,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2022-03-19 07:36:12,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2022-03-19 07:36:12,799 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2022-03-19 07:36:12,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:12,800 INFO L478 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2022-03-19 07:36:12,800 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:12,800 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2022-03-19 07:36:12,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 07:36:12,800 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:12,800 INFO L500 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:12,819 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:13,008 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,SelfDestructingSolverStorable15,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:13,009 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:13,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:13,009 INFO L85 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 15 times [2022-03-19 07:36:13,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:13,009 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [370135178] [2022-03-19 07:36:13,036 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:13,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1453570377, now seen corresponding path program 1 times [2022-03-19 07:36:13,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:13,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797639290] [2022-03-19 07:36:13,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:13,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:13,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:13,042 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:13,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:13,047 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:13,047 INFO L85 PathProgramCache]: Analyzing trace with hash 1949808860, now seen corresponding path program 16 times [2022-03-19 07:36:13,047 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:13,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333053755] [2022-03-19 07:36:13,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:13,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:13,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:13,165 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:13,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:13,169 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:13,169 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:13,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333053755] [2022-03-19 07:36:13,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [333053755] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:13,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1996598917] [2022-03-19 07:36:13,169 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:13,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:13,170 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:13,171 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) [2022-03-19 07:36:13,172 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 07:36:13,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:13,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:13,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 19 conjunts are in the unsatisfiable core [2022-03-19 07:36:13,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:13,257 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:13,258 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:13,442 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:13,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1996598917] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:13,443 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:13,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-03-19 07:36:13,443 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:13,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [370135178] [2022-03-19 07:36:13,443 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [370135178] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:13,443 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:13,443 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 07:36:13,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305172446] [2022-03-19 07:36:13,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:13,443 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 07:36:13,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:13,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 07:36:13,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2022-03-19 07:36:13,444 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:13,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:13,578 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2022-03-19 07:36:13,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 07:36:13,578 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-03-19 07:36:13,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:13,579 INFO L225 Difference]: With dead ends: 26 [2022-03-19 07:36:13,579 INFO L226 Difference]: Without dead ends: 21 [2022-03-19 07:36:13,579 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=273, Invalid=657, Unknown=0, NotChecked=0, Total=930 [2022-03-19 07:36:13,580 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:13,580 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:13,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-19 07:36:13,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-19 07:36:13,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.0625) internal successors, (17), 16 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:13,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2022-03-19 07:36:13,583 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2022-03-19 07:36:13,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:13,583 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2022-03-19 07:36:13,583 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.25) internal successors, (15), 11 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:13,583 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2022-03-19 07:36:13,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-03-19 07:36:13,583 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:13,583 INFO L500 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:13,600 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:13,795 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,SelfDestructingSolverStorable16,SelfDestructingSolverStorable17 [2022-03-19 07:36:13,795 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:13,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:13,796 INFO L85 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 17 times [2022-03-19 07:36:13,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:13,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1732228453] [2022-03-19 07:36:13,828 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:13,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1394465033, now seen corresponding path program 1 times [2022-03-19 07:36:13,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:13,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842293540] [2022-03-19 07:36:13,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:13,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:13,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:13,834 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:13,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:13,841 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:13,841 INFO L85 PathProgramCache]: Analyzing trace with hash 350993782, now seen corresponding path program 18 times [2022-03-19 07:36:13,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:13,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679805121] [2022-03-19 07:36:13,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:13,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:13,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:13,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:13,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:13,958 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:13,959 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:13,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679805121] [2022-03-19 07:36:13,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679805121] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:13,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544712974] [2022-03-19 07:36:13,959 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:13,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:13,959 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:13,960 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) [2022-03-19 07:36:13,961 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 07:36:14,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-03-19 07:36:14,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:14,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 07:36:14,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:14,076 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:14,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:14,437 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:14,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544712974] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:14,438 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:14,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 15] total 27 [2022-03-19 07:36:14,438 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:14,438 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1732228453] [2022-03-19 07:36:14,438 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1732228453] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:14,438 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:14,438 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 07:36:14,438 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981282921] [2022-03-19 07:36:14,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:14,438 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 07:36:14,439 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:14,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 07:36:14,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=521, Unknown=0, NotChecked=0, Total=702 [2022-03-19 07:36:14,439 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:14,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:14,590 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2022-03-19 07:36:14,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 07:36:14,591 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-03-19 07:36:14,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:14,591 INFO L225 Difference]: With dead ends: 27 [2022-03-19 07:36:14,591 INFO L226 Difference]: Without dead ends: 22 [2022-03-19 07:36:14,592 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=339, Invalid=993, Unknown=0, NotChecked=0, Total=1332 [2022-03-19 07:36:14,592 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:14,592 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 07:36:14,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-03-19 07:36:14,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-03-19 07:36:14,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:14,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2022-03-19 07:36:14,595 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2022-03-19 07:36:14,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:14,595 INFO L478 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2022-03-19 07:36:14,595 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:14,595 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2022-03-19 07:36:14,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 07:36:14,596 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:14,596 INFO L500 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:14,602 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:14,799 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,SelfDestructingSolverStorable19,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:14,800 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:14,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:14,800 INFO L85 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 19 times [2022-03-19 07:36:14,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:14,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [914688003] [2022-03-19 07:36:14,830 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:14,831 INFO L85 PathProgramCache]: Analyzing trace with hash -1335359689, now seen corresponding path program 1 times [2022-03-19 07:36:14,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:14,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37241110] [2022-03-19 07:36:14,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:14,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:14,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:14,840 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:14,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:14,850 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:14,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1967633380, now seen corresponding path program 20 times [2022-03-19 07:36:14,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:14,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650822105] [2022-03-19 07:36:14,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:14,851 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:14,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:14,972 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:14,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:14,975 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:14,975 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:14,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650822105] [2022-03-19 07:36:14,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650822105] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:14,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894864865] [2022-03-19 07:36:14,975 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:14,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:14,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:15,004 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) [2022-03-19 07:36:15,006 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 07:36:15,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:15,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:15,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 26 conjunts are in the unsatisfiable core [2022-03-19 07:36:15,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:15,088 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:15,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:15,572 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:15,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894864865] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:15,572 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:15,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 16] total 29 [2022-03-19 07:36:15,573 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:15,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [914688003] [2022-03-19 07:36:15,573 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [914688003] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:15,573 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:15,573 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 07:36:15,573 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270594606] [2022-03-19 07:36:15,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:15,573 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 07:36:15,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:15,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 07:36:15,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2022-03-19 07:36:15,574 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:15,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:15,772 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2022-03-19 07:36:15,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 07:36:15,773 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-03-19 07:36:15,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:15,773 INFO L225 Difference]: With dead ends: 28 [2022-03-19 07:36:15,773 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 07:36:15,774 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=394, Invalid=1166, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 07:36:15,774 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:15,774 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:15,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 07:36:15,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 07:36:15,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 18 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:15,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2022-03-19 07:36:15,777 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2022-03-19 07:36:15,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:15,777 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2022-03-19 07:36:15,777 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:15,777 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2022-03-19 07:36:15,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-03-19 07:36:15,777 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:15,777 INFO L500 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:15,807 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:15,987 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,SelfDestructingSolverStorable20,SelfDestructingSolverStorable21 [2022-03-19 07:36:15,987 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:15,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:15,988 INFO L85 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 21 times [2022-03-19 07:36:15,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:15,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1123794526] [2022-03-19 07:36:16,009 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:16,012 INFO L85 PathProgramCache]: Analyzing trace with hash -1276254345, now seen corresponding path program 1 times [2022-03-19 07:36:16,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:16,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643361698] [2022-03-19 07:36:16,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:16,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:16,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:16,018 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:16,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:16,028 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:16,028 INFO L85 PathProgramCache]: Analyzing trace with hash -830631370, now seen corresponding path program 22 times [2022-03-19 07:36:16,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:16,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069517191] [2022-03-19 07:36:16,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:16,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:16,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:16,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:16,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:16,174 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:16,175 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:16,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069517191] [2022-03-19 07:36:16,175 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069517191] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:16,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168983960] [2022-03-19 07:36:16,175 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:16,175 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:16,175 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:16,176 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) [2022-03-19 07:36:16,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 07:36:16,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:16,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:16,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-19 07:36:16,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:16,268 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:16,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:16,587 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:16,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168983960] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:16,587 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:16,587 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 28 [2022-03-19 07:36:16,587 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:16,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1123794526] [2022-03-19 07:36:16,587 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1123794526] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:16,588 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:16,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 07:36:16,588 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891184956] [2022-03-19 07:36:16,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:16,588 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 07:36:16,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:16,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 07:36:16,588 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=535, Unknown=0, NotChecked=0, Total=756 [2022-03-19 07:36:16,589 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:16,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:16,775 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2022-03-19 07:36:16,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 07:36:16,776 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2022-03-19 07:36:16,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:16,776 INFO L225 Difference]: With dead ends: 29 [2022-03-19 07:36:16,776 INFO L226 Difference]: Without dead ends: 24 [2022-03-19 07:36:16,777 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=1125, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 07:36:16,783 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:16,784 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:16,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-03-19 07:36:16,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-03-19 07:36:16,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:16,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2022-03-19 07:36:16,788 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2022-03-19 07:36:16,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:16,789 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2022-03-19 07:36:16,789 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2) internal successors, (18), 14 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:16,789 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2022-03-19 07:36:16,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 07:36:16,789 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:16,789 INFO L500 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:16,807 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:16,989 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,SelfDestructingSolverStorable22,SelfDestructingSolverStorable23 [2022-03-19 07:36:16,990 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:16,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:16,990 INFO L85 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 23 times [2022-03-19 07:36:16,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:16,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1994464717] [2022-03-19 07:36:17,013 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:17,014 INFO L85 PathProgramCache]: Analyzing trace with hash -1217149001, now seen corresponding path program 1 times [2022-03-19 07:36:17,014 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:17,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817677786] [2022-03-19 07:36:17,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:17,014 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:17,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:17,019 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:17,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:17,023 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:17,023 INFO L85 PathProgramCache]: Analyzing trace with hash 56692572, now seen corresponding path program 24 times [2022-03-19 07:36:17,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:17,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012382663] [2022-03-19 07:36:17,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:17,023 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:17,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:17,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:17,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:17,164 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:17,165 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:17,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012382663] [2022-03-19 07:36:17,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012382663] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:17,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648638478] [2022-03-19 07:36:17,165 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:17,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:17,166 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:17,167 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) [2022-03-19 07:36:17,167 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 07:36:17,238 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 07:36:17,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:17,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-19 07:36:17,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:17,321 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:17,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:17,700 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:17,700 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648638478] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:17,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:17,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 30 [2022-03-19 07:36:17,700 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:17,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1994464717] [2022-03-19 07:36:17,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1994464717] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:17,701 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:17,701 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 07:36:17,701 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876826600] [2022-03-19 07:36:17,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:17,701 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 07:36:17,701 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:17,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 07:36:17,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=252, Invalid=618, Unknown=0, NotChecked=0, Total=870 [2022-03-19 07:36:17,702 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:17,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:17,907 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2022-03-19 07:36:17,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 07:36:17,907 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-03-19 07:36:17,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:17,908 INFO L225 Difference]: With dead ends: 30 [2022-03-19 07:36:17,908 INFO L226 Difference]: Without dead ends: 25 [2022-03-19 07:36:17,908 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=497, Invalid=1309, Unknown=0, NotChecked=0, Total=1806 [2022-03-19 07:36:17,909 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:17,909 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:17,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-19 07:36:17,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-19 07:36:17,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.05) internal successors, (21), 20 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:17,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2022-03-19 07:36:17,911 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2022-03-19 07:36:17,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:17,911 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2022-03-19 07:36:17,911 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.1875) internal successors, (19), 15 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:17,912 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2022-03-19 07:36:17,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-03-19 07:36:17,912 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:17,912 INFO L500 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:17,922 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:18,115 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,SelfDestructingSolverStorable24,SelfDestructingSolverStorable25 [2022-03-19 07:36:18,116 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:18,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:18,116 INFO L85 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 25 times [2022-03-19 07:36:18,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:18,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1388782509] [2022-03-19 07:36:18,141 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:18,142 INFO L85 PathProgramCache]: Analyzing trace with hash -1158043657, now seen corresponding path program 1 times [2022-03-19 07:36:18,142 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:18,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328755804] [2022-03-19 07:36:18,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:18,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:18,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:18,146 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:18,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:18,150 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:18,150 INFO L85 PathProgramCache]: Analyzing trace with hash 1793930998, now seen corresponding path program 26 times [2022-03-19 07:36:18,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:18,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479752217] [2022-03-19 07:36:18,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:18,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:18,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:18,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:18,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:18,325 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:18,325 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:18,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479752217] [2022-03-19 07:36:18,325 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1479752217] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:18,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [368608226] [2022-03-19 07:36:18,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:18,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:18,326 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:18,327 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) [2022-03-19 07:36:18,334 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 07:36:18,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:18,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:18,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 29 conjunts are in the unsatisfiable core [2022-03-19 07:36:18,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:18,442 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:18,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:18,877 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:18,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [368608226] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:18,878 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:18,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 32 [2022-03-19 07:36:18,878 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:18,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1388782509] [2022-03-19 07:36:18,878 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1388782509] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:18,878 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:18,878 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 07:36:18,878 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410952323] [2022-03-19 07:36:18,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:18,878 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 07:36:18,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:18,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 07:36:18,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=707, Unknown=0, NotChecked=0, Total=992 [2022-03-19 07:36:18,879 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:19,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:19,128 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2022-03-19 07:36:19,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 07:36:19,128 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2022-03-19 07:36:19,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:19,129 INFO L225 Difference]: With dead ends: 31 [2022-03-19 07:36:19,129 INFO L226 Difference]: Without dead ends: 26 [2022-03-19 07:36:19,130 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2022-03-19 07:36:19,131 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:19,131 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 68 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:19,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-03-19 07:36:19,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-03-19 07:36:19,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:19,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2022-03-19 07:36:19,134 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2022-03-19 07:36:19,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:19,134 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2022-03-19 07:36:19,134 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 16 states have internal predecessors, (20), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:19,134 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2022-03-19 07:36:19,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 07:36:19,134 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:19,134 INFO L500 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:19,152 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:19,347 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26,SelfDestructingSolverStorable27 [2022-03-19 07:36:19,347 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:19,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:19,348 INFO L85 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 27 times [2022-03-19 07:36:19,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:19,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [531776202] [2022-03-19 07:36:19,368 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:19,369 INFO L85 PathProgramCache]: Analyzing trace with hash -1098938313, now seen corresponding path program 1 times [2022-03-19 07:36:19,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:19,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702492577] [2022-03-19 07:36:19,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:19,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:19,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:19,373 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:19,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:19,377 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:19,377 INFO L85 PathProgramCache]: Analyzing trace with hash -186252644, now seen corresponding path program 28 times [2022-03-19 07:36:19,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:19,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041426813] [2022-03-19 07:36:19,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:19,377 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:19,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:19,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:19,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:19,554 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:19,554 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:19,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041426813] [2022-03-19 07:36:19,555 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041426813] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:19,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178425106] [2022-03-19 07:36:19,555 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:19,555 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:19,555 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:19,556 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) [2022-03-19 07:36:19,556 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 07:36:19,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:19,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:19,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 31 conjunts are in the unsatisfiable core [2022-03-19 07:36:19,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:19,680 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:19,680 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:20,208 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:20,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178425106] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:20,209 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:20,209 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 34 [2022-03-19 07:36:20,209 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:20,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [531776202] [2022-03-19 07:36:20,209 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [531776202] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:20,209 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:20,209 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 07:36:20,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619344430] [2022-03-19 07:36:20,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:20,210 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 07:36:20,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:20,210 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 07:36:20,210 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=320, Invalid=802, Unknown=0, NotChecked=0, Total=1122 [2022-03-19 07:36:20,210 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:20,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:20,473 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2022-03-19 07:36:20,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 07:36:20,474 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-03-19 07:36:20,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:20,474 INFO L225 Difference]: With dead ends: 32 [2022-03-19 07:36:20,474 INFO L226 Difference]: Without dead ends: 27 [2022-03-19 07:36:20,475 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=633, Invalid=1719, Unknown=0, NotChecked=0, Total=2352 [2022-03-19 07:36:20,475 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:20,475 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 58 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 257 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:20,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-19 07:36:20,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-19 07:36:20,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0454545454545454) internal successors, (23), 22 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:20,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-03-19 07:36:20,478 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2022-03-19 07:36:20,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:20,478 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-03-19 07:36:20,478 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 17 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:20,478 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-03-19 07:36:20,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-03-19 07:36:20,478 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:20,479 INFO L500 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:20,495 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:20,683 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable28,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:20,684 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:20,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:20,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 29 times [2022-03-19 07:36:20,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:20,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1101265211] [2022-03-19 07:36:20,707 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:20,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1039832969, now seen corresponding path program 1 times [2022-03-19 07:36:20,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:20,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1519994036] [2022-03-19 07:36:20,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:20,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:20,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:20,714 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:20,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:20,728 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:20,728 INFO L85 PathProgramCache]: Analyzing trace with hash -1442403402, now seen corresponding path program 30 times [2022-03-19 07:36:20,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:20,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944512624] [2022-03-19 07:36:20,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:20,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:20,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:20,920 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:20,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:20,931 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:20,931 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:20,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944512624] [2022-03-19 07:36:20,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944512624] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:20,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429318720] [2022-03-19 07:36:20,931 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:20,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:20,931 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:20,933 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) [2022-03-19 07:36:20,934 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 07:36:21,133 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2022-03-19 07:36:21,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:21,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 07:36:21,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:21,214 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:21,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:22,064 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:22,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1429318720] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:22,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:22,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 21] total 39 [2022-03-19 07:36:22,065 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:22,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1101265211] [2022-03-19 07:36:22,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1101265211] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:22,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:22,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 07:36:22,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343033986] [2022-03-19 07:36:22,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:22,066 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 07:36:22,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:22,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 07:36:22,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=379, Invalid=1103, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 07:36:22,066 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:22,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:22,415 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2022-03-19 07:36:22,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 07:36:22,415 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-03-19 07:36:22,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:22,417 INFO L225 Difference]: With dead ends: 33 [2022-03-19 07:36:22,417 INFO L226 Difference]: Without dead ends: 28 [2022-03-19 07:36:22,418 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=729, Invalid=2241, Unknown=0, NotChecked=0, Total=2970 [2022-03-19 07:36:22,418 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:22,418 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 93 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:22,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-03-19 07:36:22,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-03-19 07:36:22,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:22,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2022-03-19 07:36:22,432 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2022-03-19 07:36:22,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:22,433 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2022-03-19 07:36:22,433 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:22,433 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2022-03-19 07:36:22,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 07:36:22,435 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:22,435 INFO L500 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:22,439 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:22,635 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,SelfDestructingSolverStorable31,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:22,636 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:22,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:22,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 31 times [2022-03-19 07:36:22,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:22,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [508783724] [2022-03-19 07:36:22,661 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:22,662 INFO L85 PathProgramCache]: Analyzing trace with hash -980727625, now seen corresponding path program 1 times [2022-03-19 07:36:22,662 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:22,662 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796680658] [2022-03-19 07:36:22,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:22,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:22,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:22,665 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:22,669 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:22,669 INFO L85 PathProgramCache]: Analyzing trace with hash -1728371236, now seen corresponding path program 32 times [2022-03-19 07:36:22,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:22,669 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625781410] [2022-03-19 07:36:22,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:22,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:22,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:22,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:22,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:22,880 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:22,881 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:22,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625781410] [2022-03-19 07:36:22,881 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625781410] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:22,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933109655] [2022-03-19 07:36:22,881 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:22,881 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:22,881 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:22,882 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) [2022-03-19 07:36:22,882 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 07:36:22,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:22,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:22,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-19 07:36:22,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:22,998 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:22,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:24,021 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:24,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933109655] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:24,021 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:24,021 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 22] total 41 [2022-03-19 07:36:24,021 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:24,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [508783724] [2022-03-19 07:36:24,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [508783724] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:24,021 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:24,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 07:36:24,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667893333] [2022-03-19 07:36:24,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:24,022 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 07:36:24,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:24,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 07:36:24,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1221, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 07:36:24,023 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:24,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:24,360 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2022-03-19 07:36:24,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 07:36:24,361 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-03-19 07:36:24,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:24,361 INFO L225 Difference]: With dead ends: 34 [2022-03-19 07:36:24,361 INFO L226 Difference]: Without dead ends: 29 [2022-03-19 07:36:24,362 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=808, Invalid=2498, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 07:36:24,362 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 309 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 344 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:24,362 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 48 Invalid, 344 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 309 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:24,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-19 07:36:24,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-19 07:36:24,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 24 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:24,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2022-03-19 07:36:24,365 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2022-03-19 07:36:24,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:24,365 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2022-03-19 07:36:24,365 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.15) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:24,365 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2022-03-19 07:36:24,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-03-19 07:36:24,366 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:24,366 INFO L500 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:24,382 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:24,579 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,SelfDestructingSolverStorable32,SelfDestructingSolverStorable33 [2022-03-19 07:36:24,579 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:24,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:24,580 INFO L85 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 33 times [2022-03-19 07:36:24,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:24,580 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [108857011] [2022-03-19 07:36:24,602 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:24,602 INFO L85 PathProgramCache]: Analyzing trace with hash -921622281, now seen corresponding path program 1 times [2022-03-19 07:36:24,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:24,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [696770441] [2022-03-19 07:36:24,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:24,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:24,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:24,606 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:24,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:24,610 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:24,610 INFO L85 PathProgramCache]: Analyzing trace with hash -2003439498, now seen corresponding path program 34 times [2022-03-19 07:36:24,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:24,610 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54684047] [2022-03-19 07:36:24,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:24,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:24,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:24,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:24,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:24,862 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:24,862 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:24,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54684047] [2022-03-19 07:36:24,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54684047] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:24,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470340427] [2022-03-19 07:36:24,862 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:24,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:24,863 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:24,864 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) [2022-03-19 07:36:24,880 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 07:36:24,900 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:24,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:24,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 37 conjunts are in the unsatisfiable core [2022-03-19 07:36:24,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:24,996 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:24,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:25,860 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:25,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470340427] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:25,860 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:25,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 40 [2022-03-19 07:36:25,861 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:25,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [108857011] [2022-03-19 07:36:25,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [108857011] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:25,861 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:25,861 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 07:36:25,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015477170] [2022-03-19 07:36:25,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:25,861 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 07:36:25,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:25,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 07:36:25,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=1123, Unknown=0, NotChecked=0, Total=1560 [2022-03-19 07:36:25,862 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:26,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:26,197 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2022-03-19 07:36:26,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-19 07:36:26,198 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2022-03-19 07:36:26,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:26,198 INFO L225 Difference]: With dead ends: 35 [2022-03-19 07:36:26,198 INFO L226 Difference]: Without dead ends: 30 [2022-03-19 07:36:26,199 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=867, Invalid=2439, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 07:36:26,199 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 333 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 370 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:26,200 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 38 Invalid, 370 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 333 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:26,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-03-19 07:36:26,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2022-03-19 07:36:26,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:26,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2022-03-19 07:36:26,202 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2022-03-19 07:36:26,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:26,202 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2022-03-19 07:36:26,202 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 20 states have internal predecessors, (24), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:26,202 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2022-03-19 07:36:26,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 07:36:26,203 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:26,203 INFO L500 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:26,219 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:26,408 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,SelfDestructingSolverStorable35,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:26,409 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:26,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:26,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 35 times [2022-03-19 07:36:26,409 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:26,409 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1911288376] [2022-03-19 07:36:26,437 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:26,438 INFO L85 PathProgramCache]: Analyzing trace with hash -862516937, now seen corresponding path program 1 times [2022-03-19 07:36:26,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:26,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107629445] [2022-03-19 07:36:26,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:26,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:26,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:26,443 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:26,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:26,454 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:26,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1940621028, now seen corresponding path program 36 times [2022-03-19 07:36:26,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:26,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126886528] [2022-03-19 07:36:26,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:26,455 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:26,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:26,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:26,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:26,702 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:26,702 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:26,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126886528] [2022-03-19 07:36:26,702 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126886528] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:26,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623785791] [2022-03-19 07:36:26,703 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:26,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:26,703 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:26,704 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) [2022-03-19 07:36:26,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 07:36:27,039 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2022-03-19 07:36:27,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:27,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-19 07:36:27,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:27,145 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:27,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:28,545 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:28,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623785791] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:28,545 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:28,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 24] total 45 [2022-03-19 07:36:28,545 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:28,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1911288376] [2022-03-19 07:36:28,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1911288376] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:28,545 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:28,545 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 07:36:28,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544821069] [2022-03-19 07:36:28,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:28,546 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 07:36:28,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:28,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 07:36:28,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=505, Invalid=1475, Unknown=0, NotChecked=0, Total=1980 [2022-03-19 07:36:28,547 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:28,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:28,937 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2022-03-19 07:36:28,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 07:36:28,938 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-03-19 07:36:28,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:28,938 INFO L225 Difference]: With dead ends: 36 [2022-03-19 07:36:28,938 INFO L226 Difference]: Without dead ends: 31 [2022-03-19 07:36:28,939 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=978, Invalid=3054, Unknown=0, NotChecked=0, Total=4032 [2022-03-19 07:36:28,940 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 354 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 354 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:28,940 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 354 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 07:36:28,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-19 07:36:28,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-19 07:36:28,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:28,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2022-03-19 07:36:28,943 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2022-03-19 07:36:28,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:28,943 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2022-03-19 07:36:28,943 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 21 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:28,943 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2022-03-19 07:36:28,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-03-19 07:36:28,943 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:28,943 INFO L500 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:28,949 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:29,149 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-03-19 07:36:29,150 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:29,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:29,150 INFO L85 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 37 times [2022-03-19 07:36:29,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:29,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1105063941] [2022-03-19 07:36:29,170 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:29,171 INFO L85 PathProgramCache]: Analyzing trace with hash -803411593, now seen corresponding path program 1 times [2022-03-19 07:36:29,171 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:29,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380131178] [2022-03-19 07:36:29,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:29,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:29,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:29,177 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:29,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:29,180 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:29,181 INFO L85 PathProgramCache]: Analyzing trace with hash 6751542, now seen corresponding path program 38 times [2022-03-19 07:36:29,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:29,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632546329] [2022-03-19 07:36:29,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:29,181 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:29,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:29,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:29,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:29,433 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:29,433 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:29,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [632546329] [2022-03-19 07:36:29,433 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [632546329] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:29,433 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674237402] [2022-03-19 07:36:29,433 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:29,433 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:29,433 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:29,434 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) [2022-03-19 07:36:29,444 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 07:36:29,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:29,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:29,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 44 conjunts are in the unsatisfiable core [2022-03-19 07:36:29,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:29,562 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:29,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:31,184 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:31,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674237402] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:31,185 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:31,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 25] total 47 [2022-03-19 07:36:31,185 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:31,185 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1105063941] [2022-03-19 07:36:31,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1105063941] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:31,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:31,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 07:36:31,185 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171996997] [2022-03-19 07:36:31,185 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:31,186 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 07:36:31,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:31,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 07:36:31,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=551, Invalid=1611, Unknown=0, NotChecked=0, Total=2162 [2022-03-19 07:36:31,187 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:31,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:31,623 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2022-03-19 07:36:31,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 07:36:31,623 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2022-03-19 07:36:31,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:31,623 INFO L225 Difference]: With dead ends: 37 [2022-03-19 07:36:31,624 INFO L226 Difference]: Without dead ends: 32 [2022-03-19 07:36:31,625 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1069, Invalid=3353, Unknown=0, NotChecked=0, Total=4422 [2022-03-19 07:36:31,625 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:31,625 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 83 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:31,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-03-19 07:36:31,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-03-19 07:36:31,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:31,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2022-03-19 07:36:31,628 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2022-03-19 07:36:31,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:31,628 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2022-03-19 07:36:31,628 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 22 states have internal predecessors, (26), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:31,628 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2022-03-19 07:36:31,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 07:36:31,628 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:31,628 INFO L500 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:31,645 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:31,835 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-19 07:36:31,835 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:31,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:31,836 INFO L85 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 39 times [2022-03-19 07:36:31,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:31,836 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1800115102] [2022-03-19 07:36:31,860 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:31,860 INFO L85 PathProgramCache]: Analyzing trace with hash -744306249, now seen corresponding path program 1 times [2022-03-19 07:36:31,860 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:31,861 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1558597052] [2022-03-19 07:36:31,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:31,861 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:31,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:31,864 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:31,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:31,867 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:31,867 INFO L85 PathProgramCache]: Analyzing trace with hash 245759068, now seen corresponding path program 40 times [2022-03-19 07:36:31,867 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:31,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033060581] [2022-03-19 07:36:31,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:31,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:32,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:32,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:32,130 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:32,131 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:32,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033060581] [2022-03-19 07:36:32,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033060581] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:32,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731765764] [2022-03-19 07:36:32,131 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:32,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:32,131 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:32,132 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) [2022-03-19 07:36:32,132 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 07:36:32,168 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:32,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:32,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 43 conjunts are in the unsatisfiable core [2022-03-19 07:36:32,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:32,276 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:33,684 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:33,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731765764] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:33,685 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:33,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23, 23] total 46 [2022-03-19 07:36:33,685 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:33,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1800115102] [2022-03-19 07:36:33,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1800115102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:33,685 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:33,685 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 07:36:33,685 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089941017] [2022-03-19 07:36:33,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:33,685 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 07:36:33,685 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:33,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 07:36:33,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=572, Invalid=1498, Unknown=0, NotChecked=0, Total=2070 [2022-03-19 07:36:33,686 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:34,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:34,134 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2022-03-19 07:36:34,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-19 07:36:34,134 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-03-19 07:36:34,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:34,134 INFO L225 Difference]: With dead ends: 38 [2022-03-19 07:36:34,134 INFO L226 Difference]: Without dead ends: 33 [2022-03-19 07:36:34,135 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1137, Invalid=3285, Unknown=0, NotChecked=0, Total=4422 [2022-03-19 07:36:34,136 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 472 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 515 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 472 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:34,136 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 63 Invalid, 515 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 472 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:34,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-19 07:36:34,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-19 07:36:34,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0357142857142858) internal successors, (29), 28 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:34,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2022-03-19 07:36:34,138 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2022-03-19 07:36:34,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:34,139 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2022-03-19 07:36:34,139 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.125) internal successors, (27), 23 states have internal predecessors, (27), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:34,139 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2022-03-19 07:36:34,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-03-19 07:36:34,139 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:34,139 INFO L500 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:34,156 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:34,348 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40,SelfDestructingSolverStorable41 [2022-03-19 07:36:34,348 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:34,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:34,349 INFO L85 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 41 times [2022-03-19 07:36:34,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:34,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [458179324] [2022-03-19 07:36:34,371 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:34,372 INFO L85 PathProgramCache]: Analyzing trace with hash -685200905, now seen corresponding path program 1 times [2022-03-19 07:36:34,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:34,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397880787] [2022-03-19 07:36:34,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:34,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:34,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:34,376 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:34,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:34,380 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:34,380 INFO L85 PathProgramCache]: Analyzing trace with hash -934942218, now seen corresponding path program 42 times [2022-03-19 07:36:34,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:34,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741077426] [2022-03-19 07:36:34,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:34,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:34,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:34,692 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:34,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:34,695 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:34,695 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:34,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741077426] [2022-03-19 07:36:34,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741077426] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:34,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956427154] [2022-03-19 07:36:34,695 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:34,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:34,695 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:34,696 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:34,697 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 07:36:34,883 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2022-03-19 07:36:34,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:34,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 07:36:34,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:35,023 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:35,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:37,305 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:37,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956427154] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:37,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:37,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 27] total 51 [2022-03-19 07:36:37,305 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:37,305 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [458179324] [2022-03-19 07:36:37,305 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [458179324] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:37,306 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:37,306 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-19 07:36:37,306 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450173948] [2022-03-19 07:36:37,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:37,306 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-19 07:36:37,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:37,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-19 07:36:37,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=1901, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 07:36:37,307 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:37,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:37,792 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2022-03-19 07:36:37,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-19 07:36:37,792 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-03-19 07:36:37,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:37,792 INFO L225 Difference]: With dead ends: 39 [2022-03-19 07:36:37,793 INFO L226 Difference]: Without dead ends: 34 [2022-03-19 07:36:37,794 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1263, Invalid=3993, Unknown=0, NotChecked=0, Total=5256 [2022-03-19 07:36:37,794 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:37,794 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 18 Invalid, 514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 469 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:37,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-03-19 07:36:37,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-03-19 07:36:37,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:37,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2022-03-19 07:36:37,797 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2022-03-19 07:36:37,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:37,797 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2022-03-19 07:36:37,797 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:37,797 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2022-03-19 07:36:37,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 07:36:37,797 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:37,798 INFO L500 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:37,803 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-03-19 07:36:38,002 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-03-19 07:36:38,002 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:38,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:38,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 43 times [2022-03-19 07:36:38,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:38,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1583089578] [2022-03-19 07:36:38,040 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:38,041 INFO L85 PathProgramCache]: Analyzing trace with hash -626095561, now seen corresponding path program 1 times [2022-03-19 07:36:38,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:38,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1131386047] [2022-03-19 07:36:38,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:38,041 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:38,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:38,047 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:38,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:38,054 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:38,054 INFO L85 PathProgramCache]: Analyzing trace with hash 1118023580, now seen corresponding path program 44 times [2022-03-19 07:36:38,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:38,054 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061533143] [2022-03-19 07:36:38,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:38,054 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:38,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:38,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:38,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:38,361 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:38,361 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:38,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061533143] [2022-03-19 07:36:38,361 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061533143] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:38,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577532997] [2022-03-19 07:36:38,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:38,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:38,361 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:38,363 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:38,363 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 07:36:38,390 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:38,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:38,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-19 07:36:38,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:38,484 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:38,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:40,973 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:40,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577532997] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:40,973 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:40,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 28] total 53 [2022-03-19 07:36:40,974 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:40,974 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1583089578] [2022-03-19 07:36:40,974 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1583089578] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:40,974 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:40,974 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 07:36:40,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505719486] [2022-03-19 07:36:40,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:40,974 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 07:36:40,974 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:40,974 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 07:36:40,975 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=701, Invalid=2055, Unknown=0, NotChecked=0, Total=2756 [2022-03-19 07:36:40,975 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:41,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:41,529 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2022-03-19 07:36:41,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 07:36:41,530 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-03-19 07:36:41,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:41,530 INFO L225 Difference]: With dead ends: 40 [2022-03-19 07:36:41,530 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 07:36:41,531 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1366, Invalid=4334, Unknown=0, NotChecked=0, Total=5700 [2022-03-19 07:36:41,531 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:41,531 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:41,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 07:36:41,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-19 07:36:41,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 30 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:41,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2022-03-19 07:36:41,534 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2022-03-19 07:36:41,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:41,534 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2022-03-19 07:36:41,534 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 25 states have internal predecessors, (29), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:41,534 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2022-03-19 07:36:41,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-03-19 07:36:41,534 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:41,535 INFO L500 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:41,551 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-03-19 07:36:41,735 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,SelfDestructingSolverStorable45,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:41,735 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:41,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:41,735 INFO L85 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 45 times [2022-03-19 07:36:41,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:41,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [79636033] [2022-03-19 07:36:41,757 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:41,758 INFO L85 PathProgramCache]: Analyzing trace with hash -566990217, now seen corresponding path program 1 times [2022-03-19 07:36:41,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:41,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583591263] [2022-03-19 07:36:41,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:41,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:41,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:41,761 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:41,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:41,764 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:41,765 INFO L85 PathProgramCache]: Analyzing trace with hash 335453878, now seen corresponding path program 46 times [2022-03-19 07:36:41,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:41,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865479915] [2022-03-19 07:36:41,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:41,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:41,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:42,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:42,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:42,082 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:42,082 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:42,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865479915] [2022-03-19 07:36:42,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865479915] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:42,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572030814] [2022-03-19 07:36:42,082 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:42,083 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:42,083 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:42,084 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:42,084 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 07:36:42,134 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:42,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:42,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 49 conjunts are in the unsatisfiable core [2022-03-19 07:36:42,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:42,234 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:42,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:44,504 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:44,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572030814] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:44,505 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:44,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 52 [2022-03-19 07:36:44,505 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:44,505 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [79636033] [2022-03-19 07:36:44,505 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [79636033] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:44,505 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:44,505 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-19 07:36:44,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17504099] [2022-03-19 07:36:44,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:44,505 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-19 07:36:44,505 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:44,506 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-19 07:36:44,506 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=725, Invalid=1927, Unknown=0, NotChecked=0, Total=2652 [2022-03-19 07:36:44,506 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:45,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:45,082 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2022-03-19 07:36:45,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-19 07:36:45,082 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-03-19 07:36:45,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:45,083 INFO L225 Difference]: With dead ends: 41 [2022-03-19 07:36:45,083 INFO L226 Difference]: Without dead ends: 36 [2022-03-19 07:36:45,083 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1443, Invalid=4257, Unknown=0, NotChecked=0, Total=5700 [2022-03-19 07:36:45,084 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 574 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:45,084 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 33 Invalid, 623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 574 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:45,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-03-19 07:36:45,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-03-19 07:36:45,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:45,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2022-03-19 07:36:45,086 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2022-03-19 07:36:45,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:45,087 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2022-03-19 07:36:45,087 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 26 states have internal predecessors, (30), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:45,087 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2022-03-19 07:36:45,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 07:36:45,087 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:45,087 INFO L500 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:45,104 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:45,295 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,SelfDestructingSolverStorable47,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:45,295 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:45,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:45,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 47 times [2022-03-19 07:36:45,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:45,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1662859671] [2022-03-19 07:36:45,321 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:45,321 INFO L85 PathProgramCache]: Analyzing trace with hash -507884873, now seen corresponding path program 1 times [2022-03-19 07:36:45,321 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:45,321 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953372387] [2022-03-19 07:36:45,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:45,322 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:45,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:45,325 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:45,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:45,328 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:45,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1845596892, now seen corresponding path program 48 times [2022-03-19 07:36:45,329 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:45,329 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960375004] [2022-03-19 07:36:45,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:45,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:45,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:45,687 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:45,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:45,689 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:45,689 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:45,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960375004] [2022-03-19 07:36:45,690 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960375004] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:45,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006934263] [2022-03-19 07:36:45,690 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:36:45,690 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:45,690 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:45,691 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:45,691 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 07:36:46,036 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2022-03-19 07:36:46,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:46,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-19 07:36:46,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:46,150 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:46,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:51,353 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:51,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006934263] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:51,354 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:51,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27, 30] total 57 [2022-03-19 07:36:51,354 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:51,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1662859671] [2022-03-19 07:36:51,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1662859671] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:51,354 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:51,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-19 07:36:51,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48557391] [2022-03-19 07:36:51,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:51,354 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-19 07:36:51,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:51,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-19 07:36:51,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=811, Invalid=2381, Unknown=0, NotChecked=0, Total=3192 [2022-03-19 07:36:51,355 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:51,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:51,961 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2022-03-19 07:36:51,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 07:36:51,961 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-03-19 07:36:51,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:51,962 INFO L225 Difference]: With dead ends: 42 [2022-03-19 07:36:51,962 INFO L226 Difference]: Without dead ends: 37 [2022-03-19 07:36:51,963 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 359 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=1584, Invalid=5058, Unknown=0, NotChecked=0, Total=6642 [2022-03-19 07:36:51,963 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 612 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:51,963 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 612 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:51,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-19 07:36:51,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-19 07:36:51,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.03125) internal successors, (33), 32 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:51,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2022-03-19 07:36:51,966 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2022-03-19 07:36:51,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:51,966 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2022-03-19 07:36:51,966 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 27 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:51,966 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2022-03-19 07:36:51,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-03-19 07:36:51,966 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:51,966 INFO L500 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:51,971 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-03-19 07:36:52,167 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48,SelfDestructingSolverStorable49 [2022-03-19 07:36:52,167 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:52,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:52,167 INFO L85 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 49 times [2022-03-19 07:36:52,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:52,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1493949765] [2022-03-19 07:36:52,189 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:52,189 INFO L85 PathProgramCache]: Analyzing trace with hash -448779529, now seen corresponding path program 1 times [2022-03-19 07:36:52,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:52,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682802880] [2022-03-19 07:36:52,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:52,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:52,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:52,193 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:52,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:52,196 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:52,197 INFO L85 PathProgramCache]: Analyzing trace with hash 1415390070, now seen corresponding path program 50 times [2022-03-19 07:36:52,197 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:52,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86978299] [2022-03-19 07:36:52,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:52,197 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:52,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:52,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:52,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:52,596 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:52,596 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:52,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86978299] [2022-03-19 07:36:52,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86978299] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:52,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071590501] [2022-03-19 07:36:52,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:36:52,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:52,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:52,598 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:52,599 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 07:36:52,657 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:36:52,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:52,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 53 conjunts are in the unsatisfiable core [2022-03-19 07:36:52,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:52,790 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:52,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:36:56,502 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:56,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071590501] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:36:56,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:36:56,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 56 [2022-03-19 07:36:56,503 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:36:56,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1493949765] [2022-03-19 07:36:56,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1493949765] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:36:56,503 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:36:56,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 07:36:56,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277742699] [2022-03-19 07:36:56,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:36:56,503 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 07:36:56,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:56,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 07:36:56,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=837, Invalid=2243, Unknown=0, NotChecked=0, Total=3080 [2022-03-19 07:36:56,504 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:57,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:36:57,128 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2022-03-19 07:36:57,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 07:36:57,128 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2022-03-19 07:36:57,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:36:57,128 INFO L225 Difference]: With dead ends: 43 [2022-03-19 07:36:57,128 INFO L226 Difference]: Without dead ends: 38 [2022-03-19 07:36:57,129 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1667, Invalid=4975, Unknown=0, NotChecked=0, Total=6642 [2022-03-19 07:36:57,130 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 747 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 07:36:57,130 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 108 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 747 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 07:36:57,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-03-19 07:36:57,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2022-03-19 07:36:57,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:57,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2022-03-19 07:36:57,137 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2022-03-19 07:36:57,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:36:57,137 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2022-03-19 07:36:57,137 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.103448275862069) internal successors, (32), 28 states have internal predecessors, (32), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:36:57,137 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2022-03-19 07:36:57,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 07:36:57,138 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:36:57,138 INFO L500 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:36:57,143 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-03-19 07:36:57,341 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-03-19 07:36:57,342 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:36:57,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:36:57,342 INFO L85 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 51 times [2022-03-19 07:36:57,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:36:57,342 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [851785207] [2022-03-19 07:36:57,364 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:36:57,364 INFO L85 PathProgramCache]: Analyzing trace with hash -389674185, now seen corresponding path program 1 times [2022-03-19 07:36:57,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:57,364 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102642418] [2022-03-19 07:36:57,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:57,364 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:57,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:57,368 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:36:57,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:36:57,371 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:36:57,371 INFO L85 PathProgramCache]: Analyzing trace with hash 963880476, now seen corresponding path program 52 times [2022-03-19 07:36:57,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:36:57,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499624120] [2022-03-19 07:36:57,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:36:57,371 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:36:57,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:57,791 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:36:57,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:36:57,794 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:57,794 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:36:57,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499624120] [2022-03-19 07:36:57,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499624120] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:36:57,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894610632] [2022-03-19 07:36:57,795 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:36:57,795 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:36:57,795 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:36:57,796 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:36:57,796 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 07:36:57,862 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:36:57,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:36:57,863 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 55 conjunts are in the unsatisfiable core [2022-03-19 07:36:57,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:36:57,976 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:36:57,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:37:01,922 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:01,922 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894610632] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:37:01,922 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:37:01,922 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 29] total 58 [2022-03-19 07:37:01,923 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:37:01,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [851785207] [2022-03-19 07:37:01,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [851785207] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:37:01,923 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:37:01,923 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 07:37:01,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347407065] [2022-03-19 07:37:01,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:37:01,923 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 07:37:01,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:01,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 07:37:01,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=896, Invalid=2410, Unknown=0, NotChecked=0, Total=3306 [2022-03-19 07:37:01,924 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:02,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:37:02,575 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2022-03-19 07:37:02,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-19 07:37:02,575 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2022-03-19 07:37:02,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:37:02,575 INFO L225 Difference]: With dead ends: 44 [2022-03-19 07:37:02,575 INFO L226 Difference]: Without dead ends: 39 [2022-03-19 07:37:02,576 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1785, Invalid=5355, Unknown=0, NotChecked=0, Total=7140 [2022-03-19 07:37:02,577 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 834 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 834 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 07:37:02,577 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 143 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 834 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 07:37:02,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-19 07:37:02,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-19 07:37:02,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0294117647058822) internal successors, (35), 34 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:02,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2022-03-19 07:37:02,579 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2022-03-19 07:37:02,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:37:02,579 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2022-03-19 07:37:02,579 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 29 states have internal predecessors, (33), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:02,579 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2022-03-19 07:37:02,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-03-19 07:37:02,580 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:37:02,580 INFO L500 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:37:02,596 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-19 07:37:02,795 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52,SelfDestructingSolverStorable53 [2022-03-19 07:37:02,795 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:37:02,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:37:02,796 INFO L85 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 53 times [2022-03-19 07:37:02,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:02,796 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [362155819] [2022-03-19 07:37:02,819 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:37:02,819 INFO L85 PathProgramCache]: Analyzing trace with hash -330568841, now seen corresponding path program 1 times [2022-03-19 07:37:02,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:02,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999676906] [2022-03-19 07:37:02,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:02,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:02,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:02,826 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:37:02,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:02,832 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:37:02,832 INFO L85 PathProgramCache]: Analyzing trace with hash -148015050, now seen corresponding path program 54 times [2022-03-19 07:37:02,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:02,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1994771573] [2022-03-19 07:37:02,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:02,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:02,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:03,270 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:37:03,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:03,273 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:03,273 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:37:03,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1994771573] [2022-03-19 07:37:03,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1994771573] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:37:03,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811997479] [2022-03-19 07:37:03,273 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:37:03,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:03,274 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:37:03,275 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:37:03,276 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 07:37:05,412 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2022-03-19 07:37:05,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:37:05,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-19 07:37:05,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:37:05,539 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:05,540 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:37:10,221 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:10,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811997479] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:37:10,222 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:37:10,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 60 [2022-03-19 07:37:10,222 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:37:10,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [362155819] [2022-03-19 07:37:10,222 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [362155819] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:37:10,222 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:37:10,222 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-19 07:37:10,222 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79986779] [2022-03-19 07:37:10,222 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:37:10,222 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-19 07:37:10,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:10,223 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-19 07:37:10,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=957, Invalid=2583, Unknown=0, NotChecked=0, Total=3540 [2022-03-19 07:37:10,223 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:10,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:37:10,936 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2022-03-19 07:37:10,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-19 07:37:10,937 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-03-19 07:37:10,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:37:10,937 INFO L225 Difference]: With dead ends: 45 [2022-03-19 07:37:10,937 INFO L226 Difference]: Without dead ends: 40 [2022-03-19 07:37:10,938 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1907, Invalid=5749, Unknown=0, NotChecked=0, Total=7656 [2022-03-19 07:37:10,938 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 893 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 950 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 893 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 07:37:10,939 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 148 Invalid, 950 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 893 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 07:37:10,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-03-19 07:37:10,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-03-19 07:37:10,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:10,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2022-03-19 07:37:10,941 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2022-03-19 07:37:10,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:37:10,941 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2022-03-19 07:37:10,941 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.096774193548387) internal successors, (34), 30 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:10,941 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2022-03-19 07:37:10,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 07:37:10,941 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:37:10,941 INFO L500 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:37:10,949 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 07:37:11,146 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,SelfDestructingSolverStorable55,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:11,146 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:37:11,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:37:11,146 INFO L85 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 55 times [2022-03-19 07:37:11,147 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:11,147 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1419218228] [2022-03-19 07:37:11,168 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:37:11,168 INFO L85 PathProgramCache]: Analyzing trace with hash -271463497, now seen corresponding path program 1 times [2022-03-19 07:37:11,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:11,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583972456] [2022-03-19 07:37:11,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:11,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:11,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:11,172 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:37:11,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:11,181 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:37:11,181 INFO L85 PathProgramCache]: Analyzing trace with hash -257037988, now seen corresponding path program 56 times [2022-03-19 07:37:11,181 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:11,181 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046070804] [2022-03-19 07:37:11,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:11,182 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:11,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:11,628 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:37:11,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:11,631 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:11,631 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:37:11,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046070804] [2022-03-19 07:37:11,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046070804] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:37:11,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150684159] [2022-03-19 07:37:11,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:37:11,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:11,631 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:37:11,632 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:37:11,633 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 07:37:11,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:37:11,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:37:11,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 59 conjunts are in the unsatisfiable core [2022-03-19 07:37:11,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:37:11,808 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:11,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:37:21,001 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:21,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1150684159] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:37:21,001 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:37:21,001 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 31] total 62 [2022-03-19 07:37:21,001 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:37:21,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1419218228] [2022-03-19 07:37:21,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1419218228] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:37:21,002 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:37:21,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-19 07:37:21,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445423688] [2022-03-19 07:37:21,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:37:21,002 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-19 07:37:21,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:21,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-19 07:37:21,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1020, Invalid=2762, Unknown=0, NotChecked=0, Total=3782 [2022-03-19 07:37:21,003 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:21,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:37:21,763 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2022-03-19 07:37:21,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-19 07:37:21,763 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2022-03-19 07:37:21,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:37:21,764 INFO L225 Difference]: With dead ends: 46 [2022-03-19 07:37:21,764 INFO L226 Difference]: Without dead ends: 41 [2022-03-19 07:37:21,764 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=2033, Invalid=6157, Unknown=0, NotChecked=0, Total=8190 [2022-03-19 07:37:21,765 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 1018 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 07:37:21,765 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 158 Invalid, 1018 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 07:37:21,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-19 07:37:21,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-19 07:37:21,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0277777777777777) internal successors, (37), 36 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:21,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2022-03-19 07:37:21,768 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2022-03-19 07:37:21,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:37:21,768 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2022-03-19 07:37:21,768 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.09375) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:21,768 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2022-03-19 07:37:21,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-03-19 07:37:21,768 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:37:21,768 INFO L500 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:37:21,785 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-19 07:37:21,985 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,SelfDestructingSolverStorable57,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:21,985 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:37:21,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:37:21,985 INFO L85 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 57 times [2022-03-19 07:37:21,985 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:21,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [127289657] [2022-03-19 07:37:22,006 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:37:22,006 INFO L85 PathProgramCache]: Analyzing trace with hash -212358153, now seen corresponding path program 1 times [2022-03-19 07:37:22,006 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:22,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336992477] [2022-03-19 07:37:22,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:22,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:22,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:22,010 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:37:22,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:22,013 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:37:22,013 INFO L85 PathProgramCache]: Analyzing trace with hash 658218230, now seen corresponding path program 58 times [2022-03-19 07:37:22,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:22,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792828065] [2022-03-19 07:37:22,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:22,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:22,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:22,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:37:22,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:22,488 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:22,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:37:22,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792828065] [2022-03-19 07:37:22,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792828065] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:37:22,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60491973] [2022-03-19 07:37:22,488 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:37:22,488 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:22,488 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:37:22,489 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:37:22,490 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 07:37:22,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:37:22,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:37:22,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 61 conjunts are in the unsatisfiable core [2022-03-19 07:37:22,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:37:22,708 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:22,708 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:37:37,588 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:37,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60491973] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:37:37,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:37:37,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 64 [2022-03-19 07:37:37,589 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:37:37,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [127289657] [2022-03-19 07:37:37,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [127289657] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:37:37,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:37:37,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-19 07:37:37,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503126336] [2022-03-19 07:37:37,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:37:37,589 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-19 07:37:37,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:37,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-19 07:37:37,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=2947, Unknown=0, NotChecked=0, Total=4032 [2022-03-19 07:37:37,590 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:38,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:37:38,410 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2022-03-19 07:37:38,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-19 07:37:38,411 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2022-03-19 07:37:38,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:37:38,411 INFO L225 Difference]: With dead ends: 47 [2022-03-19 07:37:38,411 INFO L226 Difference]: Without dead ends: 42 [2022-03-19 07:37:38,412 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 15.4s TimeCoverageRelationStatistics Valid=2163, Invalid=6579, Unknown=0, NotChecked=0, Total=8742 [2022-03-19 07:37:38,412 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1012 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 07:37:38,412 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 153 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1012 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 07:37:38,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2022-03-19 07:37:38,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2022-03-19 07:37:38,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:38,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2022-03-19 07:37:38,415 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2022-03-19 07:37:38,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:37:38,415 INFO L478 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2022-03-19 07:37:38,415 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 32 states have internal predecessors, (36), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:37:38,415 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2022-03-19 07:37:38,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 07:37:38,415 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:37:38,415 INFO L500 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:37:38,432 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-19 07:37:38,627 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58,SelfDestructingSolverStorable59 [2022-03-19 07:37:38,627 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:37:38,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:37:38,628 INFO L85 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 59 times [2022-03-19 07:37:38,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:37:38,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [27274614] [2022-03-19 07:37:38,650 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:37:38,650 INFO L85 PathProgramCache]: Analyzing trace with hash -153252809, now seen corresponding path program 1 times [2022-03-19 07:37:38,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:38,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024630762] [2022-03-19 07:37:38,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:38,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:38,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:38,654 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:37:38,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:37:38,656 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:37:38,657 INFO L85 PathProgramCache]: Analyzing trace with hash -1033610084, now seen corresponding path program 60 times [2022-03-19 07:37:38,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:37:38,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950025585] [2022-03-19 07:37:38,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:37:38,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:37:38,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:39,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:37:39,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:37:39,176 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:39,176 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:37:39,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950025585] [2022-03-19 07:37:39,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950025585] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:37:39,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1523964799] [2022-03-19 07:37:39,176 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:37:39,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:37:39,177 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:37:39,178 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:37:39,179 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 07:37:41,277 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2022-03-19 07:37:41,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:37:41,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 66 conjunts are in the unsatisfiable core [2022-03-19 07:37:41,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:37:41,418 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:37:41,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:38:08,942 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:08,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1523964799] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:38:08,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:38:08,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33, 36] total 69 [2022-03-19 07:38:08,943 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:38:08,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [27274614] [2022-03-19 07:38:08,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [27274614] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:38:08,943 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:38:08,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-19 07:38:08,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267599579] [2022-03-19 07:38:08,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:38:08,943 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-19 07:38:08,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:38:08,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-19 07:38:08,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1189, Invalid=3503, Unknown=0, NotChecked=0, Total=4692 [2022-03-19 07:38:08,944 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:09,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:38:09,816 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2022-03-19 07:38:09,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-19 07:38:09,817 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-03-19 07:38:09,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:38:09,817 INFO L225 Difference]: With dead ends: 48 [2022-03-19 07:38:09,817 INFO L226 Difference]: Without dead ends: 43 [2022-03-19 07:38:09,818 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 536 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=2334, Invalid=7566, Unknown=0, NotChecked=0, Total=9900 [2022-03-19 07:38:09,819 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1022 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 1085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1022 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 07:38:09,819 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 103 Invalid, 1085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1022 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 07:38:09,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-19 07:38:09,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-19 07:38:09,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0263157894736843) internal successors, (39), 38 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:09,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2022-03-19 07:38:09,821 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2022-03-19 07:38:09,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:38:09,821 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2022-03-19 07:38:09,821 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.088235294117647) internal successors, (37), 33 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:09,821 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2022-03-19 07:38:09,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-03-19 07:38:09,822 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:38:09,822 INFO L500 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:38:09,835 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-19 07:38:10,022 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60,SelfDestructingSolverStorable61 [2022-03-19 07:38:10,023 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:38:10,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:38:10,023 INFO L85 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 61 times [2022-03-19 07:38:10,023 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:38:10,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [479215139] [2022-03-19 07:38:10,047 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:38:10,047 INFO L85 PathProgramCache]: Analyzing trace with hash -94147465, now seen corresponding path program 1 times [2022-03-19 07:38:10,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:38:10,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [486083194] [2022-03-19 07:38:10,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:38:10,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:38:10,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:38:10,051 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:38:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:38:10,054 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:38:10,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1940680266, now seen corresponding path program 62 times [2022-03-19 07:38:10,055 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:38:10,055 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925695631] [2022-03-19 07:38:10,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:38:10,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:38:10,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:38:10,619 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:38:10,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:38:10,621 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:10,621 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:38:10,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925695631] [2022-03-19 07:38:10,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925695631] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:38:10,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658594042] [2022-03-19 07:38:10,622 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:38:10,622 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:38:10,622 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:38:10,623 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:38:10,623 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 07:38:10,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:38:10,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:38:10,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-19 07:38:10,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:38:10,800 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:10,800 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:38:42,711 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:42,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658594042] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:38:42,712 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:38:42,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 37] total 71 [2022-03-19 07:38:42,712 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:38:42,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [479215139] [2022-03-19 07:38:42,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [479215139] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:38:42,712 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:38:42,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-19 07:38:42,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521310087] [2022-03-19 07:38:42,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:38:42,713 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-19 07:38:42,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:38:42,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-19 07:38:42,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1259, Invalid=3711, Unknown=0, NotChecked=0, Total=4970 [2022-03-19 07:38:42,713 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:43,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:38:43,660 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2022-03-19 07:38:43,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-19 07:38:43,660 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 42 [2022-03-19 07:38:43,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:38:43,661 INFO L225 Difference]: With dead ends: 49 [2022-03-19 07:38:43,661 INFO L226 Difference]: Without dead ends: 44 [2022-03-19 07:38:43,662 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 569 ImplicationChecksByTransitivity, 32.3s TimeCoverageRelationStatistics Valid=2473, Invalid=8033, Unknown=0, NotChecked=0, Total=10506 [2022-03-19 07:38:43,662 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1079 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 1144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 1079 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 07:38:43,662 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 98 Invalid, 1144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 1079 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 07:38:43,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-03-19 07:38:43,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2022-03-19 07:38:43,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:43,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2022-03-19 07:38:43,665 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2022-03-19 07:38:43,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:38:43,665 INFO L478 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2022-03-19 07:38:43,665 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 34 states have internal predecessors, (38), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:38:43,665 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2022-03-19 07:38:43,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 07:38:43,665 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:38:43,665 INFO L500 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:38:43,683 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-03-19 07:38:43,866 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,SelfDestructingSolverStorable63,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:38:43,866 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:38:43,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:38:43,866 INFO L85 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 63 times [2022-03-19 07:38:43,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:38:43,866 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [373774015] [2022-03-19 07:38:43,894 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:38:43,894 INFO L85 PathProgramCache]: Analyzing trace with hash -35042121, now seen corresponding path program 1 times [2022-03-19 07:38:43,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:38:43,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420673141] [2022-03-19 07:38:43,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:38:43,894 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:38:43,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:38:43,898 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:38:43,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:38:43,901 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:38:43,901 INFO L85 PathProgramCache]: Analyzing trace with hash 4915164, now seen corresponding path program 64 times [2022-03-19 07:38:43,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:38:43,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503840319] [2022-03-19 07:38:43,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:38:43,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:38:43,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:38:44,467 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:38:44,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:38:44,470 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:44,470 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:38:44,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503840319] [2022-03-19 07:38:44,470 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503840319] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:38:44,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783119931] [2022-03-19 07:38:44,471 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:38:44,471 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:38:44,471 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:38:44,472 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:38:44,472 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 07:38:44,556 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:38:44,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:38:44,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 67 conjunts are in the unsatisfiable core [2022-03-19 07:38:44,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:38:44,698 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:38:44,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:39:22,014 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:39:22,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783119931] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:39:22,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:39:22,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 35] total 70 [2022-03-19 07:39:22,015 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:39:22,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [373774015] [2022-03-19 07:39:22,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [373774015] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:39:22,015 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:39:22,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-19 07:39:22,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474230373] [2022-03-19 07:39:22,015 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:39:22,016 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-19 07:39:22,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:39:22,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-19 07:39:22,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1292, Invalid=3538, Unknown=0, NotChecked=0, Total=4830 [2022-03-19 07:39:22,017 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:39:22,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:39:22,941 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2022-03-19 07:39:22,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-19 07:39:22,941 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2022-03-19 07:39:22,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:39:22,942 INFO L225 Difference]: With dead ends: 50 [2022-03-19 07:39:22,942 INFO L226 Difference]: Without dead ends: 45 [2022-03-19 07:39:22,942 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 37.6s TimeCoverageRelationStatistics Valid=2577, Invalid=7929, Unknown=0, NotChecked=0, Total=10506 [2022-03-19 07:39:22,943 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 1128 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 1195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 1128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 07:39:22,943 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 83 Invalid, 1195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 1128 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 07:39:22,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-19 07:39:22,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-19 07:39:22,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.025) internal successors, (41), 40 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:39:22,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2022-03-19 07:39:22,945 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2022-03-19 07:39:22,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:39:22,945 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2022-03-19 07:39:22,945 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 35 states have internal predecessors, (39), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:39:22,945 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2022-03-19 07:39:22,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-19 07:39:22,946 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:39:22,946 INFO L500 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:39:22,963 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-19 07:39:23,162 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,SelfDestructingSolverStorable65,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:39:23,163 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:39:23,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:39:23,163 INFO L85 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 65 times [2022-03-19 07:39:23,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:39:23,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1238509538] [2022-03-19 07:39:23,184 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:39:23,184 INFO L85 PathProgramCache]: Analyzing trace with hash 24063223, now seen corresponding path program 1 times [2022-03-19 07:39:23,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:39:23,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051237548] [2022-03-19 07:39:23,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:39:23,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:39:23,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:39:23,188 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:39:23,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:39:23,191 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:39:23,192 INFO L85 PathProgramCache]: Analyzing trace with hash 188831350, now seen corresponding path program 66 times [2022-03-19 07:39:23,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:39:23,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017487722] [2022-03-19 07:39:23,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:39:23,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:39:23,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:39:23,771 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:39:23,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:39:23,774 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:39:23,774 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:39:23,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017487722] [2022-03-19 07:39:23,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017487722] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:39:23,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44238319] [2022-03-19 07:39:23,775 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:39:23,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:39:23,775 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:39:23,776 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:39:23,776 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 07:39:24,783 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 18 check-sat command(s) [2022-03-19 07:39:24,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:39:24,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 72 conjunts are in the unsatisfiable core [2022-03-19 07:39:24,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:39:24,925 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:39:24,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:40:07,661 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:07,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44238319] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:40:07,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:40:07,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 39] total 75 [2022-03-19 07:40:07,662 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:40:07,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1238509538] [2022-03-19 07:40:07,662 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1238509538] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:40:07,662 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:40:07,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-19 07:40:07,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888127607] [2022-03-19 07:40:07,662 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:40:07,662 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-19 07:40:07,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:40:07,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-19 07:40:07,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=4145, Unknown=0, NotChecked=0, Total=5550 [2022-03-19 07:40:07,663 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:08,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:40:08,690 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2022-03-19 07:40:08,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-19 07:40:08,690 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-03-19 07:40:08,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:40:08,691 INFO L225 Difference]: With dead ends: 51 [2022-03-19 07:40:08,691 INFO L226 Difference]: Without dead ends: 46 [2022-03-19 07:40:08,691 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 43.1s TimeCoverageRelationStatistics Valid=2763, Invalid=9009, Unknown=0, NotChecked=0, Total=11772 [2022-03-19 07:40:08,692 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 1204 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 1273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 1204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 07:40:08,692 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 93 Invalid, 1273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 1204 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 07:40:08,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-03-19 07:40:08,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2022-03-19 07:40:08,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:08,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2022-03-19 07:40:08,694 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2022-03-19 07:40:08,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:40:08,694 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2022-03-19 07:40:08,694 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 36 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:08,695 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2022-03-19 07:40:08,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-19 07:40:08,695 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:40:08,695 INFO L500 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:40:08,704 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 07:40:08,902 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66,SelfDestructingSolverStorable67 [2022-03-19 07:40:08,902 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:40:08,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:40:08,902 INFO L85 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 67 times [2022-03-19 07:40:08,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:40:08,902 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [987860214] [2022-03-19 07:40:08,923 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:40:08,923 INFO L85 PathProgramCache]: Analyzing trace with hash 83168567, now seen corresponding path program 1 times [2022-03-19 07:40:08,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:40:08,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986963459] [2022-03-19 07:40:08,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:40:08,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:40:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:40:08,927 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:40:08,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:40:08,930 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:40:08,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1595265820, now seen corresponding path program 68 times [2022-03-19 07:40:08,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:40:08,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552083177] [2022-03-19 07:40:08,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:40:08,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:40:08,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:40:09,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:40:09,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:40:09,523 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:09,523 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:40:09,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552083177] [2022-03-19 07:40:09,523 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552083177] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:40:09,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1625053100] [2022-03-19 07:40:09,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:40:09,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:40:09,523 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:40:09,524 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:40:09,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 07:40:09,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:40:09,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:40:09,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 74 conjunts are in the unsatisfiable core [2022-03-19 07:40:09,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:40:09,696 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:09,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:40:57,293 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:57,293 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1625053100] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:40:57,293 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:40:57,293 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 40] total 77 [2022-03-19 07:40:57,293 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:40:57,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [987860214] [2022-03-19 07:40:57,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [987860214] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:40:57,294 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:40:57,294 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-19 07:40:57,294 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702104666] [2022-03-19 07:40:57,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:40:57,294 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-19 07:40:57,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:40:57,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-19 07:40:57,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1481, Invalid=4371, Unknown=0, NotChecked=0, Total=5852 [2022-03-19 07:40:57,295 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:58,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:40:58,392 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2022-03-19 07:40:58,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-19 07:40:58,393 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2022-03-19 07:40:58,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:40:58,393 INFO L225 Difference]: With dead ends: 52 [2022-03-19 07:40:58,393 INFO L226 Difference]: Without dead ends: 47 [2022-03-19 07:40:58,394 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 674 ImplicationChecksByTransitivity, 48.0s TimeCoverageRelationStatistics Valid=2914, Invalid=9518, Unknown=0, NotChecked=0, Total=12432 [2022-03-19 07:40:58,394 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1222 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 1222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 07:40:58,394 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 43 Invalid, 1293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 1222 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 07:40:58,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-19 07:40:58,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-19 07:40:58,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0238095238095237) internal successors, (43), 42 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:58,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2022-03-19 07:40:58,396 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2022-03-19 07:40:58,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:40:58,397 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2022-03-19 07:40:58,397 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 37 states have internal predecessors, (41), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:40:58,397 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2022-03-19 07:40:58,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-03-19 07:40:58,397 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:40:58,397 INFO L500 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:40:58,414 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-19 07:40:58,608 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68,SelfDestructingSolverStorable69 [2022-03-19 07:40:58,608 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:40:58,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:40:58,608 INFO L85 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 69 times [2022-03-19 07:40:58,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:40:58,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [484734875] [2022-03-19 07:40:58,631 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:40:58,631 INFO L85 PathProgramCache]: Analyzing trace with hash 142273911, now seen corresponding path program 1 times [2022-03-19 07:40:58,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:40:58,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389048737] [2022-03-19 07:40:58,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:40:58,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:40:58,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:40:58,636 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:40:58,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:40:58,639 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:40:58,639 INFO L85 PathProgramCache]: Analyzing trace with hash -2049905866, now seen corresponding path program 70 times [2022-03-19 07:40:58,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:40:58,639 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445008026] [2022-03-19 07:40:58,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:40:58,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:40:58,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:40:59,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:40:59,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:40:59,291 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:59,291 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:40:59,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445008026] [2022-03-19 07:40:59,291 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445008026] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:40:59,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065369794] [2022-03-19 07:40:59,291 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:40:59,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:40:59,292 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:40:59,293 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:40:59,293 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-19 07:40:59,386 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:40:59,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:40:59,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 73 conjunts are in the unsatisfiable core [2022-03-19 07:40:59,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:40:59,535 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:40:59,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:41:26,340 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:41:26,340 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065369794] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:41:26,340 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:41:26,340 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 76 [2022-03-19 07:41:26,341 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:41:26,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [484734875] [2022-03-19 07:41:26,341 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [484734875] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:41:26,341 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:41:26,341 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-19 07:41:26,341 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269735792] [2022-03-19 07:41:26,341 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:41:26,341 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-19 07:41:26,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:41:26,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-19 07:41:26,342 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1517, Invalid=4183, Unknown=0, NotChecked=0, Total=5700 [2022-03-19 07:41:26,342 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:41:27,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:41:27,405 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2022-03-19 07:41:27,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-19 07:41:27,405 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 46 [2022-03-19 07:41:27,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:41:27,406 INFO L225 Difference]: With dead ends: 53 [2022-03-19 07:41:27,406 INFO L226 Difference]: Without dead ends: 48 [2022-03-19 07:41:27,407 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 57 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=3027, Invalid=9405, Unknown=0, NotChecked=0, Total=12432 [2022-03-19 07:41:27,407 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 1437 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 1510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 1437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 07:41:27,408 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 188 Invalid, 1510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 1437 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 07:41:27,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-03-19 07:41:27,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2022-03-19 07:41:27,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:41:27,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2022-03-19 07:41:27,410 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2022-03-19 07:41:27,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:41:27,410 INFO L478 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2022-03-19 07:41:27,410 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 38 states have internal predecessors, (42), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:41:27,410 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2022-03-19 07:41:27,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 07:41:27,410 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:41:27,411 INFO L500 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:41:27,429 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-03-19 07:41:27,623 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,SelfDestructingSolverStorable71,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:41:27,623 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:41:27,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:41:27,624 INFO L85 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 71 times [2022-03-19 07:41:27,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:41:27,624 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [15680192] [2022-03-19 07:41:27,656 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:41:27,656 INFO L85 PathProgramCache]: Analyzing trace with hash 201379255, now seen corresponding path program 1 times [2022-03-19 07:41:27,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:41:27,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840901378] [2022-03-19 07:41:27,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:41:27,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:41:27,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:41:27,660 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:41:27,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:41:27,662 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:41:27,663 INFO L85 PathProgramCache]: Analyzing trace with hash 913888860, now seen corresponding path program 72 times [2022-03-19 07:41:27,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:41:27,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250744980] [2022-03-19 07:41:27,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:41:27,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:41:27,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:41:28,349 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:41:28,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:41:28,353 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:41:28,354 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:41:28,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250744980] [2022-03-19 07:41:28,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250744980] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:41:28,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645838502] [2022-03-19 07:41:28,354 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:41:28,354 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:41:28,354 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:41:28,355 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:41:28,355 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-19 07:41:30,341 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2022-03-19 07:41:30,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:41:30,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 78 conjunts are in the unsatisfiable core [2022-03-19 07:41:30,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:41:30,490 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:41:30,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:42:37,900 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:42:37,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645838502] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:42:37,901 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:42:37,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39, 42] total 81 [2022-03-19 07:42:37,901 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:42:37,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [15680192] [2022-03-19 07:42:37,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [15680192] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:42:37,901 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:42:37,901 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-19 07:42:37,901 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27276142] [2022-03-19 07:42:37,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:42:37,902 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-19 07:42:37,902 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:42:37,902 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-19 07:42:37,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1639, Invalid=4841, Unknown=0, NotChecked=0, Total=6480 [2022-03-19 07:42:37,903 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:42:39,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:42:39,149 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2022-03-19 07:42:39,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-19 07:42:39,149 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-03-19 07:42:39,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:42:39,149 INFO L225 Difference]: With dead ends: 54 [2022-03-19 07:42:39,150 INFO L226 Difference]: Without dead ends: 49 [2022-03-19 07:42:39,150 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 749 ImplicationChecksByTransitivity, 67.7s TimeCoverageRelationStatistics Valid=3228, Invalid=10578, Unknown=0, NotChecked=0, Total=13806 [2022-03-19 07:42:39,150 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 137 mSDsCounter, 0 mSdLazyCounter, 1469 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 1544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 1469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 07:42:39,151 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 148 Invalid, 1544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 1469 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 07:42:39,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-19 07:42:39,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-19 07:42:39,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0227272727272727) internal successors, (45), 44 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:42:39,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2022-03-19 07:42:39,153 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2022-03-19 07:42:39,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:42:39,153 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2022-03-19 07:42:39,153 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.075) internal successors, (43), 39 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:42:39,153 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2022-03-19 07:42:39,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-03-19 07:42:39,154 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:42:39,154 INFO L500 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:42:39,159 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-19 07:42:39,358 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,SelfDestructingSolverStorable73,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:42:39,359 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:42:39,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:42:39,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 73 times [2022-03-19 07:42:39,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:42:39,359 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1728204031] [2022-03-19 07:42:39,382 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:42:39,383 INFO L85 PathProgramCache]: Analyzing trace with hash 260484599, now seen corresponding path program 1 times [2022-03-19 07:42:39,383 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:42:39,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227029866] [2022-03-19 07:42:39,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:42:39,383 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:42:39,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:42:39,386 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:42:39,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:42:39,389 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:42:39,389 INFO L85 PathProgramCache]: Analyzing trace with hash -1697755146, now seen corresponding path program 74 times [2022-03-19 07:42:39,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:42:39,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467541087] [2022-03-19 07:42:39,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:42:39,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:42:39,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:42:40,103 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:42:40,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:42:40,105 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:42:40,106 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:42:40,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467541087] [2022-03-19 07:42:40,106 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467541087] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:42:40,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [522931955] [2022-03-19 07:42:40,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:42:40,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:42:40,106 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:42:40,107 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:42:40,108 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-19 07:42:40,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:42:40,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:42:40,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-19 07:42:40,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:42:40,308 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:42:40,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:43:59,176 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:43:59,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [522931955] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:43:59,176 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:43:59,176 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40, 43] total 83 [2022-03-19 07:43:59,176 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:43:59,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1728204031] [2022-03-19 07:43:59,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1728204031] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:43:59,177 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:43:59,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-19 07:43:59,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693405787] [2022-03-19 07:43:59,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:43:59,177 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-19 07:43:59,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:43:59,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-19 07:43:59,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1721, Invalid=5085, Unknown=0, NotChecked=0, Total=6806 [2022-03-19 07:43:59,178 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:44:00,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:44:00,445 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2022-03-19 07:44:00,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-19 07:44:00,445 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 48 [2022-03-19 07:44:00,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:44:00,446 INFO L225 Difference]: With dead ends: 55 [2022-03-19 07:44:00,446 INFO L226 Difference]: Without dead ends: 50 [2022-03-19 07:44:00,447 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 788 ImplicationChecksByTransitivity, 79.1s TimeCoverageRelationStatistics Valid=3391, Invalid=11129, Unknown=0, NotChecked=0, Total=14520 [2022-03-19 07:44:00,447 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1418 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1495 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 1418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 07:44:00,447 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 23 Invalid, 1495 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 1418 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 07:44:00,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-03-19 07:44:00,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2022-03-19 07:44:00,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0222222222222221) internal successors, (46), 45 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:44:00,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2022-03-19 07:44:00,450 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2022-03-19 07:44:00,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:44:00,450 INFO L478 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2022-03-19 07:44:00,450 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 40 states have internal predecessors, (44), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:44:00,450 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2022-03-19 07:44:00,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-19 07:44:00,450 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:44:00,450 INFO L500 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:44:00,470 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-03-19 07:44:00,663 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,SelfDestructingSolverStorable75,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:44:00,663 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:44:00,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:44:00,664 INFO L85 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 75 times [2022-03-19 07:44:00,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:44:00,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1137665536] [2022-03-19 07:44:00,685 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:44:00,685 INFO L85 PathProgramCache]: Analyzing trace with hash 319589943, now seen corresponding path program 1 times [2022-03-19 07:44:00,685 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:44:00,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446456481] [2022-03-19 07:44:00,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:44:00,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:44:00,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:44:00,689 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:44:00,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:44:00,691 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:44:00,692 INFO L85 PathProgramCache]: Analyzing trace with hash -1054340708, now seen corresponding path program 76 times [2022-03-19 07:44:00,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:44:00,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808262527] [2022-03-19 07:44:00,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:44:00,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:44:00,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:44:01,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:44:01,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:44:01,440 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:44:01,440 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:44:01,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808262527] [2022-03-19 07:44:01,440 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808262527] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:44:01,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153115208] [2022-03-19 07:44:01,440 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:44:01,440 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:44:01,440 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:44:01,441 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:44:01,442 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-19 07:44:01,496 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:44:01,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:44:01,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 79 conjunts are in the unsatisfiable core [2022-03-19 07:44:01,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:44:01,652 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:44:01,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:45:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:45:50,588 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153115208] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:45:50,588 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:45:50,588 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2022-03-19 07:45:50,589 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:45:50,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1137665536] [2022-03-19 07:45:50,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1137665536] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:45:50,589 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:45:50,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-19 07:45:50,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401293319] [2022-03-19 07:45:50,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:45:50,589 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-19 07:45:50,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:45:50,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-19 07:45:50,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1760, Invalid=4882, Unknown=0, NotChecked=0, Total=6642 [2022-03-19 07:45:50,590 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:45:51,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:45:51,853 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2022-03-19 07:45:51,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-19 07:45:51,853 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2022-03-19 07:45:51,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:45:51,853 INFO L225 Difference]: With dead ends: 56 [2022-03-19 07:45:51,853 INFO L226 Difference]: Without dead ends: 51 [2022-03-19 07:45:51,854 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 108.7s TimeCoverageRelationStatistics Valid=3513, Invalid=11007, Unknown=0, NotChecked=0, Total=14520 [2022-03-19 07:45:51,855 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1574 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 1653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 1574 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 07:45:51,855 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 103 Invalid, 1653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 1574 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 07:45:51,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-19 07:45:51,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-19 07:45:51,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0217391304347827) internal successors, (47), 46 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:45:51,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-03-19 07:45:51,857 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2022-03-19 07:45:51,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:45:51,857 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-03-19 07:45:51,857 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 41 states have internal predecessors, (45), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:45:51,858 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-03-19 07:45:51,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-03-19 07:45:51,858 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:45:51,858 INFO L500 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:45:51,875 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2022-03-19 07:45:52,065 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76,SelfDestructingSolverStorable77 [2022-03-19 07:45:52,065 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:45:52,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:45:52,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 77 times [2022-03-19 07:45:52,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:45:52,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1795147893] [2022-03-19 07:45:52,087 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:45:52,088 INFO L85 PathProgramCache]: Analyzing trace with hash 378695287, now seen corresponding path program 1 times [2022-03-19 07:45:52,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:45:52,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841972508] [2022-03-19 07:45:52,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:45:52,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:45:52,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:45:52,096 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:45:52,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:45:52,100 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:45:52,100 INFO L85 PathProgramCache]: Analyzing trace with hash 1711637686, now seen corresponding path program 78 times [2022-03-19 07:45:52,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:45:52,100 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1625796635] [2022-03-19 07:45:52,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:45:52,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:45:52,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:45:52,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:45:52,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:45:52,850 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:45:52,850 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:45:52,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1625796635] [2022-03-19 07:45:52,851 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1625796635] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:45:52,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [364398287] [2022-03-19 07:45:52,851 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 07:45:52,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:45:52,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:45:52,852 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:45:52,852 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-19 07:45:55,771 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2022-03-19 07:45:55,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:45:55,776 WARN L261 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 84 conjunts are in the unsatisfiable core [2022-03-19 07:45:55,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:45:55,958 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:45:55,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:47:39,104 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:47:39,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [364398287] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:47:39,104 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:47:39,104 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 45] total 87 [2022-03-19 07:47:39,105 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:47:39,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1795147893] [2022-03-19 07:47:39,105 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1795147893] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:47:39,105 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:47:39,105 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-19 07:47:39,105 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213814887] [2022-03-19 07:47:39,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:47:39,105 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-19 07:47:39,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:47:39,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-19 07:47:39,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1891, Invalid=5591, Unknown=0, NotChecked=0, Total=7482 [2022-03-19 07:47:39,106 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:47:40,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:47:40,500 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2022-03-19 07:47:40,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-19 07:47:40,501 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-03-19 07:47:40,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:47:40,501 INFO L225 Difference]: With dead ends: 57 [2022-03-19 07:47:40,501 INFO L226 Difference]: Without dead ends: 52 [2022-03-19 07:47:40,503 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 103.2s TimeCoverageRelationStatistics Valid=3729, Invalid=12273, Unknown=0, NotChecked=0, Total=16002 [2022-03-19 07:47:40,503 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 1617 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 1698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 1617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 07:47:40,503 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 68 Invalid, 1698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 1617 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 07:47:40,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-03-19 07:47:40,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2022-03-19 07:47:40,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0212765957446808) internal successors, (48), 47 states have internal predecessors, (48), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:47:40,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2022-03-19 07:47:40,505 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2022-03-19 07:47:40,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:47:40,506 INFO L478 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2022-03-19 07:47:40,506 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.069767441860465) internal successors, (46), 42 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:47:40,506 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2022-03-19 07:47:40,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-19 07:47:40,506 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:47:40,506 INFO L500 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:47:40,515 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-03-19 07:47:40,711 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78,SelfDestructingSolverStorable79 [2022-03-19 07:47:40,711 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:47:40,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:47:40,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 79 times [2022-03-19 07:47:40,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:47:40,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1615338214] [2022-03-19 07:47:40,734 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:47:40,734 INFO L85 PathProgramCache]: Analyzing trace with hash 437800631, now seen corresponding path program 1 times [2022-03-19 07:47:40,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:47:40,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443837959] [2022-03-19 07:47:40,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:47:40,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:47:40,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:47:40,737 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:47:40,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:47:40,740 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:47:40,740 INFO L85 PathProgramCache]: Analyzing trace with hash 1557621980, now seen corresponding path program 80 times [2022-03-19 07:47:40,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:47:40,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1122819967] [2022-03-19 07:47:40,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:47:40,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:47:40,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:47:41,542 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:47:41,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:47:41,545 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:47:41,545 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:47:41,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1122819967] [2022-03-19 07:47:41,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1122819967] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:47:41,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253281594] [2022-03-19 07:47:41,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 07:47:41,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:47:41,545 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:47:41,546 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:47:41,547 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-19 07:47:41,623 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 07:47:41,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:47:41,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 83 conjunts are in the unsatisfiable core [2022-03-19 07:47:41,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:47:41,783 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:47:41,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 07:49:45,884 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:49:45,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253281594] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 07:49:45,885 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 07:49:45,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43, 43] total 86 [2022-03-19 07:49:45,885 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 07:49:45,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1615338214] [2022-03-19 07:49:45,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1615338214] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 07:49:45,885 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 07:49:45,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-19 07:49:45,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788901664] [2022-03-19 07:49:45,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 07:49:45,886 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-19 07:49:45,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 07:49:45,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-19 07:49:45,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1932, Invalid=5378, Unknown=0, NotChecked=0, Total=7310 [2022-03-19 07:49:45,887 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:49:47,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 07:49:47,251 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2022-03-19 07:49:47,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-19 07:49:47,251 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2022-03-19 07:49:47,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 07:49:47,251 INFO L225 Difference]: With dead ends: 58 [2022-03-19 07:49:47,251 INFO L226 Difference]: Without dead ends: 53 [2022-03-19 07:49:47,253 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 123.8s TimeCoverageRelationStatistics Valid=3857, Invalid=12145, Unknown=0, NotChecked=0, Total=16002 [2022-03-19 07:49:47,253 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 6 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 1785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 1702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 07:49:47,253 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 73 Invalid, 1785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 1702 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 07:49:47,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-19 07:49:47,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-19 07:49:47,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0208333333333333) internal successors, (49), 48 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:49:47,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2022-03-19 07:49:47,256 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2022-03-19 07:49:47,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 07:49:47,256 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2022-03-19 07:49:47,256 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 43 states have internal predecessors, (47), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 07:49:47,256 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2022-03-19 07:49:47,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-03-19 07:49:47,256 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 07:49:47,256 INFO L500 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 07:49:47,275 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-19 07:49:47,471 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable81 [2022-03-19 07:49:47,472 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 07:49:47,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 07:49:47,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 81 times [2022-03-19 07:49:47,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 07:49:47,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1924835437] [2022-03-19 07:49:47,493 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 07:49:47,493 INFO L85 PathProgramCache]: Analyzing trace with hash 496905975, now seen corresponding path program 1 times [2022-03-19 07:49:47,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:49:47,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411313636] [2022-03-19 07:49:47,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:49:47,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:49:47,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:49:47,496 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 07:49:47,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 07:49:47,498 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 07:49:47,498 INFO L85 PathProgramCache]: Analyzing trace with hash 1078102390, now seen corresponding path program 82 times [2022-03-19 07:49:47,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 07:49:47,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858569097] [2022-03-19 07:49:47,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 07:49:47,498 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 07:49:47,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:49:48,282 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 07:49:48,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 07:49:48,284 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:49:48,284 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 07:49:48,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858569097] [2022-03-19 07:49:48,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858569097] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 07:49:48,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760336] [2022-03-19 07:49:48,285 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 07:49:48,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 07:49:48,285 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 07:49:48,286 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 07:49:48,286 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-19 07:49:48,398 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 07:49:48,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 07:49:48,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 85 conjunts are in the unsatisfiable core [2022-03-19 07:49:48,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 07:49:48,564 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 07:49:48,564 INFO L328 TraceCheckSpWp]: Computing backward predicates...