/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-30 21:14:55,853 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-30 21:14:55,855 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-30 21:14:55,905 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-30 21:14:55,964 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2022-01-30 21:14:55,994 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-30 21:14:55,995 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-30 21:14:55,995 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-01-30 21:14:55,995 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-01-30 21:14:55,996 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-01-30 21:14:55,996 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-01-30 21:14:55,997 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-01-30 21:14:55,997 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-01-30 21:14:55,997 INFO L138 SettingsManager]: * Use SBE=true [2022-01-30 21:14:55,997 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-30 21:14:55,998 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-30 21:14:55,998 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-30 21:14:55,998 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-30 21:14:55,998 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-30 21:14:55,999 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-30 21:14:56,000 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-30 21:14:56,000 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-30 21:14:56,000 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-30 21:14:56,000 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-30 21:14:56,000 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-30 21:14:56,000 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2022-01-30 21:14:56,001 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-01-30 21:14:56,002 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-30 21:14:56,002 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-30 21:14:56,235 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-30 21:14:56,260 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-30 21:14:56,263 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-30 21:14:56,264 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-30 21:14:56,265 INFO L275 PluginConnector]: CDTParser initialized [2022-01-30 21:14:56,266 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2022-01-30 21:14:56,326 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fef309fe/d9cf96203c544da09e4da8657520936b/FLAG73e237aae [2022-01-30 21:14:56,645 INFO L306 CDTParser]: Found 1 translation units. [2022-01-30 21:14:56,645 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i [2022-01-30 21:14:56,651 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fef309fe/d9cf96203c544da09e4da8657520936b/FLAG73e237aae [2022-01-30 21:14:57,052 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3fef309fe/d9cf96203c544da09e4da8657520936b [2022-01-30 21:14:57,054 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-30 21:14:57,055 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-30 21:14:57,057 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-30 21:14:57,057 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-30 21:14:57,060 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-30 21:14:57,061 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,062 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58929d53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57, skipping insertion in model container [2022-01-30 21:14:57,062 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-30 21:14:57,078 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-30 21:14:57,200 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i[819,832] [2022-01-30 21:14:57,210 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-30 21:14:57,215 INFO L203 MainTranslator]: Completed pre-run [2022-01-30 21:14:57,227 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_palindrome_ground.i[819,832] [2022-01-30 21:14:57,232 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-30 21:14:57,246 INFO L208 MainTranslator]: Completed translation [2022-01-30 21:14:57,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57 WrapperNode [2022-01-30 21:14:57,247 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-30 21:14:57,257 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-30 21:14:57,257 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-30 21:14:57,257 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-30 21:14:57,266 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,266 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,272 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,272 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,292 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,295 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,296 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,298 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-30 21:14:57,299 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-30 21:14:57,299 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-30 21:14:57,299 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-30 21:14:57,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (1/1) ... [2022-01-30 21:14:57,308 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-30 21:14:57,326 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:14:57,336 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-01-30 21:14:57,346 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-01-30 21:14:57,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-30 21:14:57,375 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-30 21:14:57,375 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-30 21:14:57,375 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-30 21:14:57,376 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-30 21:14:57,378 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-30 21:14:57,378 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-30 21:14:57,378 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-30 21:14:57,378 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-30 21:14:57,379 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-30 21:14:57,379 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-30 21:14:57,379 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-30 21:14:57,379 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-30 21:14:57,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-30 21:14:57,382 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-30 21:14:57,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-30 21:14:57,441 INFO L234 CfgBuilder]: Building ICFG [2022-01-30 21:14:57,443 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-30 21:14:57,539 INFO L275 CfgBuilder]: Performing block encoding [2022-01-30 21:14:57,544 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-30 21:14:57,544 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-01-30 21:14:57,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.01 09:14:57 BoogieIcfgContainer [2022-01-30 21:14:57,546 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-30 21:14:57,547 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-30 21:14:57,547 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-30 21:14:57,554 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-30 21:14:57,555 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.01 09:14:57" (1/3) ... [2022-01-30 21:14:57,555 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@258d9466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.01 09:14:57, skipping insertion in model container [2022-01-30 21:14:57,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.01 09:14:57" (2/3) ... [2022-01-30 21:14:57,556 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@258d9466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.01 09:14:57, skipping insertion in model container [2022-01-30 21:14:57,556 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.01 09:14:57" (3/3) ... [2022-01-30 21:14:57,557 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_palindrome_ground.i [2022-01-30 21:14:57,562 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-01-30 21:14:57,563 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-30 21:14:57,600 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-30 21:14:57,606 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2022-01-30 21:14:57,606 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-30 21:14:57,619 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-01-30 21:14:57,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-30 21:14:57,624 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:14:57,624 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:14:57,625 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:14:57,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:14:57,630 INFO L85 PathProgramCache]: Analyzing trace with hash -1013160769, now seen corresponding path program 1 times [2022-01-30 21:14:57,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:14:57,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235967189] [2022-01-30 21:14:57,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:57,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:14:57,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:57,762 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:14:57,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:57,773 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-30 21:14:57,774 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:14:57,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235967189] [2022-01-30 21:14:57,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235967189] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 21:14:57,775 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-30 21:14:57,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-30 21:14:57,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617456707] [2022-01-30 21:14:57,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 21:14:57,781 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-30 21:14:57,781 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:14:57,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-30 21:14:57,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-30 21:14:57,807 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:57,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:14:57,840 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2022-01-30 21:14:57,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-30 21:14:57,843 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-01-30 21:14:57,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:14:57,848 INFO L225 Difference]: With dead ends: 46 [2022-01-30 21:14:57,848 INFO L226 Difference]: Without dead ends: 22 [2022-01-30 21:14:57,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-30 21:14:57,854 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 20 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-30 21:14:57,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 31 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-30 21:14:57,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-01-30 21:14:57,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-01-30 21:14:57,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:14:57,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-01-30 21:14:57,906 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2022-01-30 21:14:57,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:14:57,906 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-01-30 21:14:57,907 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:57,907 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-01-30 21:14:57,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-30 21:14:57,908 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:14:57,908 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:14:57,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-30 21:14:57,909 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:14:57,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:14:57,910 INFO L85 PathProgramCache]: Analyzing trace with hash 211576627, now seen corresponding path program 1 times [2022-01-30 21:14:57,910 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:14:57,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855530235] [2022-01-30 21:14:57,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:57,911 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:14:57,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:14:58,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,029 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-30 21:14:58,029 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:14:58,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855530235] [2022-01-30 21:14:58,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855530235] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-30 21:14:58,030 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-30 21:14:58,030 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-30 21:14:58,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100682119] [2022-01-30 21:14:58,031 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-30 21:14:58,032 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-30 21:14:58,032 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:14:58,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-30 21:14:58,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-30 21:14:58,033 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:58,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:14:58,112 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2022-01-30 21:14:58,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-30 21:14:58,113 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-01-30 21:14:58,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:14:58,114 INFO L225 Difference]: With dead ends: 40 [2022-01-30 21:14:58,114 INFO L226 Difference]: Without dead ends: 26 [2022-01-30 21:14:58,115 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-01-30 21:14:58,116 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 21 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 21:14:58,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 26 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 21:14:58,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-01-30 21:14:58,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2022-01-30 21:14:58,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:14:58,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-01-30 21:14:58,123 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 15 [2022-01-30 21:14:58,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:14:58,124 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-01-30 21:14:58,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:58,124 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-01-30 21:14:58,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-30 21:14:58,125 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:14:58,125 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:14:58,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-30 21:14:58,125 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:14:58,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:14:58,126 INFO L85 PathProgramCache]: Analyzing trace with hash 775264175, now seen corresponding path program 1 times [2022-01-30 21:14:58,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:14:58,127 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331231962] [2022-01-30 21:14:58,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:58,127 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:14:58,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:14:58,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-30 21:14:58,183 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:14:58,183 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331231962] [2022-01-30 21:14:58,183 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331231962] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:14:58,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007664433] [2022-01-30 21:14:58,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:58,184 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:14:58,184 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:14:58,191 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:14:58,195 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-01-30 21:14:58,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2022-01-30 21:14:58,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 21:14:58,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-30 21:14:58,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 21:14:58,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-01-30 21:14:58,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007664433] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 21:14:58,373 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 21:14:58,373 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 8 [2022-01-30 21:14:58,373 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035736120] [2022-01-30 21:14:58,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 21:14:58,374 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-01-30 21:14:58,374 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:14:58,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-01-30 21:14:58,375 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2022-01-30 21:14:58,375 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:58,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:14:58,477 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2022-01-30 21:14:58,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-30 21:14:58,477 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-01-30 21:14:58,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:14:58,479 INFO L225 Difference]: With dead ends: 54 [2022-01-30 21:14:58,480 INFO L226 Difference]: Without dead ends: 39 [2022-01-30 21:14:58,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2022-01-30 21:14:58,482 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 46 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 21:14:58,482 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 35 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 21:14:58,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-30 21:14:58,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2022-01-30 21:14:58,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:14:58,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-01-30 21:14:58,505 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 19 [2022-01-30 21:14:58,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:14:58,506 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-01-30 21:14:58,506 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:58,506 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-01-30 21:14:58,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-30 21:14:58,507 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:14:58,508 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:14:58,538 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-01-30 21:14:58,735 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:14:58,736 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:14:58,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:14:58,737 INFO L85 PathProgramCache]: Analyzing trace with hash 1709096679, now seen corresponding path program 2 times [2022-01-30 21:14:58,737 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:14:58,737 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163615609] [2022-01-30 21:14:58,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:58,737 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:14:58,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:14:58,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:58,858 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-01-30 21:14:58,858 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:14:58,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163615609] [2022-01-30 21:14:58,859 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163615609] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:14:58,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832898289] [2022-01-30 21:14:58,859 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-01-30 21:14:58,859 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:14:58,859 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:14:58,860 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:14:58,867 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-01-30 21:14:58,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-01-30 21:14:58,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 21:14:58,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 4 conjunts are in the unsatisfiable core [2022-01-30 21:14:58,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 21:14:59,030 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-30 21:14:59,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 21:14:59,129 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-01-30 21:14:59,129 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832898289] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 21:14:59,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 21:14:59,129 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5, 5] total 12 [2022-01-30 21:14:59,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702217138] [2022-01-30 21:14:59,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 21:14:59,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-30 21:14:59,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:14:59,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-30 21:14:59,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2022-01-30 21:14:59,131 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:59,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:14:59,324 INFO L93 Difference]: Finished difference Result 70 states and 83 transitions. [2022-01-30 21:14:59,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-30 21:14:59,325 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-01-30 21:14:59,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:14:59,327 INFO L225 Difference]: With dead ends: 70 [2022-01-30 21:14:59,328 INFO L226 Difference]: Without dead ends: 53 [2022-01-30 21:14:59,329 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2022-01-30 21:14:59,334 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 52 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 21:14:59,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 41 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 21:14:59,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-01-30 21:14:59,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-01-30 21:14:59,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:14:59,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-01-30 21:14:59,346 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 27 [2022-01-30 21:14:59,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:14:59,346 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-01-30 21:14:59,347 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:14:59,347 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-01-30 21:14:59,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-30 21:14:59,348 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:14:59,348 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:14:59,377 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-01-30 21:14:59,563 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-01-30 21:14:59,564 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:14:59,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:14:59,564 INFO L85 PathProgramCache]: Analyzing trace with hash 1111941907, now seen corresponding path program 3 times [2022-01-30 21:14:59,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:14:59,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467835157] [2022-01-30 21:14:59,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:14:59,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:14:59,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:59,697 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:14:59,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:14:59,722 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-30 21:14:59,722 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:14:59,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467835157] [2022-01-30 21:14:59,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467835157] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:14:59,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984401306] [2022-01-30 21:14:59,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-01-30 21:14:59,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:14:59,723 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:14:59,728 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:14:59,756 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-01-30 21:14:59,915 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-01-30 21:14:59,916 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 21:14:59,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 10 conjunts are in the unsatisfiable core [2022-01-30 21:14:59,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 21:15:00,018 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-30 21:15:00,018 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 21:15:00,237 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2022-01-30 21:15:00,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984401306] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 21:15:00,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 21:15:00,237 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 22 [2022-01-30 21:15:00,237 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619843158] [2022-01-30 21:15:00,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 21:15:00,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-30 21:15:00,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:15:00,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-30 21:15:00,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2022-01-30 21:15:00,239 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:15:00,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:15:00,632 INFO L93 Difference]: Finished difference Result 110 states and 126 transitions. [2022-01-30 21:15:00,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-30 21:15:00,632 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-01-30 21:15:00,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:15:00,633 INFO L225 Difference]: With dead ends: 110 [2022-01-30 21:15:00,633 INFO L226 Difference]: Without dead ends: 81 [2022-01-30 21:15:00,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=591, Invalid=969, Unknown=0, NotChecked=0, Total=1560 [2022-01-30 21:15:00,635 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 123 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 133 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 216 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 133 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-30 21:15:00,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 40 Invalid, 216 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 133 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-30 21:15:00,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-30 21:15:00,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 74. [2022-01-30 21:15:00,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:15:00,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2022-01-30 21:15:00,645 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 47 [2022-01-30 21:15:00,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:15:00,645 INFO L470 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2022-01-30 21:15:00,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:15:00,645 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2022-01-30 21:15:00,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-01-30 21:15:00,647 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:15:00,647 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:15:00,672 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-01-30 21:15:00,860 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:15:00,861 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:15:00,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:15:00,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1774280803, now seen corresponding path program 4 times [2022-01-30 21:15:00,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:15:00,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714501117] [2022-01-30 21:15:00,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:15:00,862 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:15:00,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:15:01,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:15:01,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:15:01,192 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-30 21:15:01,193 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:15:01,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714501117] [2022-01-30 21:15:01,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714501117] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:15:01,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1731296680] [2022-01-30 21:15:01,193 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-01-30 21:15:01,193 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:15:01,193 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:15:01,196 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:15:01,212 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-01-30 21:15:01,295 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-01-30 21:15:01,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 21:15:01,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 20 conjunts are in the unsatisfiable core [2022-01-30 21:15:01,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 21:15:01,420 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-30 21:15:01,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 21:15:02,003 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-01-30 21:15:02,003 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1731296680] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 21:15:02,003 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 21:15:02,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 21] total 42 [2022-01-30 21:15:02,004 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016550757] [2022-01-30 21:15:02,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 21:15:02,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-30 21:15:02,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:15:02,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-30 21:15:02,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2022-01-30 21:15:02,006 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:15:03,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:15:03,010 INFO L93 Difference]: Finished difference Result 172 states and 207 transitions. [2022-01-30 21:15:03,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-30 21:15:03,010 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2022-01-30 21:15:03,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:15:03,014 INFO L225 Difference]: With dead ends: 172 [2022-01-30 21:15:03,015 INFO L226 Difference]: Without dead ends: 141 [2022-01-30 21:15:03,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 982 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2381, Invalid=3939, Unknown=0, NotChecked=0, Total=6320 [2022-01-30 21:15:03,018 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 234 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-30 21:15:03,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [234 Valid, 55 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-30 21:15:03,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2022-01-30 21:15:03,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 134. [2022-01-30 21:15:03,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:15:03,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2022-01-30 21:15:03,048 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 69 [2022-01-30 21:15:03,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:15:03,050 INFO L470 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2022-01-30 21:15:03,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:15:03,050 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2022-01-30 21:15:03,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2022-01-30 21:15:03,058 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:15:03,058 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:15:03,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-01-30 21:15:03,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:15:03,280 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:15:03,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:15:03,280 INFO L85 PathProgramCache]: Analyzing trace with hash 887439137, now seen corresponding path program 5 times [2022-01-30 21:15:03,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:15:03,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979941137] [2022-01-30 21:15:03,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:15:03,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:15:03,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:15:04,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:15:04,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:15:04,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-30 21:15:04,026 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:15:04,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979941137] [2022-01-30 21:15:04,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979941137] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:15:04,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959414561] [2022-01-30 21:15:04,026 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 [2022-01-30 21:15:04,026 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:15:04,027 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:15:04,028 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:15:04,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-01-30 21:18:56,490 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 39 check-sat command(s) [2022-01-30 21:18:56,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-01-30 21:18:56,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 548 conjuncts, 40 conjunts are in the unsatisfiable core [2022-01-30 21:18:56,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-01-30 21:18:57,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-30 21:18:57,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-01-30 21:18:58,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1805 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2022-01-30 21:18:58,827 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959414561] provided 0 perfect and 2 imperfect interpolant sequences [2022-01-30 21:18:58,827 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-01-30 21:18:58,827 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 41] total 82 [2022-01-30 21:18:58,827 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273802965] [2022-01-30 21:18:58,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-01-30 21:18:58,828 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-01-30 21:18:58,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-01-30 21:18:58,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-01-30 21:18:58,831 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3242, Invalid=3400, Unknown=0, NotChecked=0, Total=6642 [2022-01-30 21:18:58,832 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:19:01,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-30 21:19:01,394 INFO L93 Difference]: Finished difference Result 312 states and 377 transitions. [2022-01-30 21:19:01,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-01-30 21:19:01,395 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2022-01-30 21:19:01,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-30 21:19:01,397 INFO L225 Difference]: With dead ends: 312 [2022-01-30 21:19:01,397 INFO L226 Difference]: Without dead ends: 261 [2022-01-30 21:19:01,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 220 SyntacticMatches, 0 SemanticMatches, 158 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3972 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=9561, Invalid=15879, Unknown=0, NotChecked=0, Total=25440 [2022-01-30 21:19:01,404 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 420 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 628 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-30 21:19:01,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [420 Valid, 40 Invalid, 628 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-30 21:19:01,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-01-30 21:19:01,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 254. [2022-01-30 21:19:01,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 254 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-01-30 21:19:01,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 256 transitions. [2022-01-30 21:19:01,431 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 256 transitions. Word has length 129 [2022-01-30 21:19:01,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-30 21:19:01,432 INFO L470 AbstractCegarLoop]: Abstraction has 254 states and 256 transitions. [2022-01-30 21:19:01,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 2.0853658536585367) internal successors, (171), 81 states have internal predecessors, (171), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-01-30 21:19:01,432 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 256 transitions. [2022-01-30 21:19:01,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2022-01-30 21:19:01,434 INFO L506 BasicCegarLoop]: Found error trace [2022-01-30 21:19:01,434 INFO L514 BasicCegarLoop]: trace histogram [78, 78, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-30 21:19:01,507 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-01-30 21:19:01,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:19:01,635 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-30 21:19:01,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-30 21:19:01,635 INFO L85 PathProgramCache]: Analyzing trace with hash -1886862295, now seen corresponding path program 6 times [2022-01-30 21:19:01,635 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-01-30 21:19:01,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033337788] [2022-01-30 21:19:01,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-30 21:19:01,636 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-30 21:19:01,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:19:03,934 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-30 21:19:03,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-30 21:19:03,946 INFO L134 CoverageAnalysis]: Checked inductivity of 7605 backedges. 0 proven. 6084 refuted. 0 times theorem prover too weak. 1521 trivial. 0 not checked. [2022-01-30 21:19:03,946 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-01-30 21:19:03,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033337788] [2022-01-30 21:19:03,946 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033337788] provided 0 perfect and 1 imperfect interpolant sequences [2022-01-30 21:19:03,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545155246] [2022-01-30 21:19:03,946 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-01-30 21:19:03,946 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-01-30 21:19:03,946 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-30 21:19:03,949 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-01-30 21:19:03,950 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process