/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:16:17,573 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:16:17,575 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:16:17,587 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:16:17,588 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:16:17,589 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:16:17,590 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:16:17,592 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:16:17,594 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:16:17,595 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:16:17,596 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:16:17,597 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:16:17,597 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:16:17,598 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:16:17,599 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:16:17,600 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:16:17,601 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:16:17,602 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:16:17,604 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:16:17,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:16:17,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:16:17,609 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:16:17,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:16:17,611 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:16:17,613 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:16:17,621 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:16:17,622 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:16:17,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:16:17,624 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 [2020-07-21 14:16:17,639 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:16:17,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:16:17,641 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:16:17,641 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:16:17,641 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:16:17,641 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:16:17,641 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:16:17,642 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:16:17,642 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:16:17,642 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:16:17,642 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:16:17,642 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:16:17,643 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:16:17,643 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:16:17,643 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:16:17,643 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:16:17,643 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:16:17,644 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:16:17,644 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:16:17,644 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:16:17,644 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:16:17,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:16:17,645 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:16:17,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:16:17,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:16:17,645 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:16:17,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:17,646 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:16:17,646 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:16:17,646 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:16:17,927 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:16:17,949 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:16:17,953 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:16:17,955 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:16:17,957 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:16:17,959 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-21 14:16:18,049 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08e7c6c5c/9e979e49d862481fa24eaae803f45a52/FLAG83e84bed9 [2020-07-21 14:16:18,530 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:16:18,531 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.c.i.v+cfa-reducer.c [2020-07-21 14:16:18,538 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08e7c6c5c/9e979e49d862481fa24eaae803f45a52/FLAG83e84bed9 [2020-07-21 14:16:18,951 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/08e7c6c5c/9e979e49d862481fa24eaae803f45a52 [2020-07-21 14:16:18,959 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:16:18,962 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:16:18,963 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:16:18,963 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:16:18,967 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:16:18,968 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:16:18" (1/1) ... [2020-07-21 14:16:18,971 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@142f4857 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:18, skipping insertion in model container [2020-07-21 14:16:18,971 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:16:18" (1/1) ... [2020-07-21 14:16:18,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:16:19,002 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:16:19,242 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:16:19,251 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:16:19,285 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:16:19,304 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:16:19,305 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19 WrapperNode [2020-07-21 14:16:19,305 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:16:19,307 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:16:19,307 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:16:19,307 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:16:19,323 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,325 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,434 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,434 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,439 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,441 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... [2020-07-21 14:16:19,444 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:16:19,444 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:16:19,444 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:16:19,445 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:16:19,446 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:16:19,515 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:16:19,515 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:16:19,515 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:16:19,515 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:16:19,516 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:16:19,517 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:16:19,517 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:16:19,517 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:16:19,518 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:16:19,518 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:16:19,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:16:19,519 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:16:19,754 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:16:19,754 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 14:16:19,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:16:19 BoogieIcfgContainer [2020-07-21 14:16:19,758 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:16:19,759 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:16:19,760 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:16:19,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:16:19,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:16:18" (1/3) ... [2020-07-21 14:16:19,764 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@607c494b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:16:19, skipping insertion in model container [2020-07-21 14:16:19,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:16:19" (2/3) ... [2020-07-21 14:16:19,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@607c494b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:16:19, skipping insertion in model container [2020-07-21 14:16:19,765 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:16:19" (3/3) ... [2020-07-21 14:16:19,767 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.c.i.v+cfa-reducer.c [2020-07-21 14:16:19,778 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:16:19,786 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:16:19,801 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:16:19,833 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:16:19,833 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:16:19,833 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:16:19,833 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:16:19,834 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:16:19,834 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:16:19,834 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:16:19,834 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:16:19,873 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 14:16:19,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:16:19,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:19,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:19,894 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:19,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:19,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1434042835, now seen corresponding path program 1 times [2020-07-21 14:16:19,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:19,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562415197] [2020-07-21 14:16:19,937 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:20,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:20,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:20,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:16:20,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:20,133 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 14:16:20,138 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 14:16:20,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:20,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:16:20,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562415197] [2020-07-21 14:16:20,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:16:20,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 14:16:20,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739394120] [2020-07-21 14:16:20,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 14:16:20,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:20,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 14:16:20,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 14:16:20,184 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-07-21 14:16:20,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:20,314 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-07-21 14:16:20,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 14:16:20,316 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-07-21 14:16:20,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:20,326 INFO L225 Difference]: With dead ends: 30 [2020-07-21 14:16:20,326 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 14:16:20,330 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-21 14:16:20,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 14:16:20,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 14:16:20,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 14:16:20,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 14:16:20,371 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 14:16:20,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:20,372 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 14:16:20,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 14:16:20,374 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 14:16:20,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 14:16:20,375 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:20,375 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:20,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:20,588 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:20,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:20,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1507594220, now seen corresponding path program 1 times [2020-07-21 14:16:20,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:20,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726342966] [2020-07-21 14:16:20,591 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:20,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:20,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:20,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:16:20,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:20,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:20,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:20,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:20,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:20,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726342966] [2020-07-21 14:16:20,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:20,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 14:16:20,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019441311] [2020-07-21 14:16:20,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 14:16:20,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:20,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 14:16:20,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 14:16:20,863 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2020-07-21 14:16:21,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:21,117 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-21 14:16:21,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 14:16:21,118 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2020-07-21 14:16:21,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:21,119 INFO L225 Difference]: With dead ends: 23 [2020-07-21 14:16:21,119 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 14:16:21,121 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2020-07-21 14:16:21,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 14:16:21,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 14:16:21,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 14:16:21,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 14:16:21,127 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-21 14:16:21,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:21,127 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 14:16:21,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 14:16:21,128 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 14:16:21,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 14:16:21,129 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:21,129 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:21,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:21,345 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:21,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:21,346 INFO L82 PathProgramCache]: Analyzing trace with hash 2102853613, now seen corresponding path program 2 times [2020-07-21 14:16:21,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:21,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393756143] [2020-07-21 14:16:21,348 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:21,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:21,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:21,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 14:16:21,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:21,517 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:21,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:21,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:21,704 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:21,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393756143] [2020-07-21 14:16:21,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:21,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-21 14:16:21,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916363435] [2020-07-21 14:16:21,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:16:21,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:21,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:16:21,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:16:21,710 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 15 states. [2020-07-21 14:16:22,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:22,225 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 14:16:22,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 14:16:22,226 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 16 [2020-07-21 14:16:22,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:22,227 INFO L225 Difference]: With dead ends: 29 [2020-07-21 14:16:22,228 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 14:16:22,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=178, Invalid=374, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:16:22,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 14:16:22,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 14:16:22,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 14:16:22,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-21 14:16:22,235 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-21 14:16:22,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:22,236 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-21 14:16:22,236 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:16:22,236 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-21 14:16:22,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 14:16:22,237 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:22,238 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:22,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:22,439 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:22,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:22,441 INFO L82 PathProgramCache]: Analyzing trace with hash 906772109, now seen corresponding path program 3 times [2020-07-21 14:16:22,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:22,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866589150] [2020-07-21 14:16:22,442 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:22,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:22,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:22,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 14:16:22,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:22,720 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:22,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:22,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:23,143 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:23,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866589150] [2020-07-21 14:16:23,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:23,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 27 [2020-07-21 14:16:23,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496217400] [2020-07-21 14:16:23,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 14:16:23,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:23,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 14:16:23,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=527, Unknown=0, NotChecked=0, Total=702 [2020-07-21 14:16:23,150 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 27 states. [2020-07-21 14:16:23,728 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-21 14:16:24,027 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-21 14:16:24,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:24,741 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 14:16:24,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 14:16:24,742 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 22 [2020-07-21 14:16:24,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:24,743 INFO L225 Difference]: With dead ends: 41 [2020-07-21 14:16:24,743 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 14:16:24,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=550, Invalid=1172, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 14:16:24,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 14:16:24,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 14:16:24,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 14:16:24,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-21 14:16:24,754 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-21 14:16:24,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:24,754 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-21 14:16:24,754 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 14:16:24,755 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-21 14:16:24,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 14:16:24,756 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:24,756 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:24,969 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:24,970 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:24,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:24,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1007922227, now seen corresponding path program 4 times [2020-07-21 14:16:24,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:24,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249674912] [2020-07-21 14:16:24,973 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:25,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:25,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:25,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 14:16:25,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:25,673 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:25,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:25,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:27,057 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:27,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249674912] [2020-07-21 14:16:27,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:27,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 51 [2020-07-21 14:16:27,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621302990] [2020-07-21 14:16:27,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-21 14:16:27,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:27,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-21 14:16:27,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=631, Invalid=1919, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 14:16:27,062 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 51 states. [2020-07-21 14:16:27,922 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 14:16:28,292 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:16:28,627 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-21 14:16:28,974 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:16:29,319 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-21 14:16:29,617 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 14:16:29,894 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 14:16:30,171 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 14:16:30,450 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 14:16:30,700 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 14:16:30,940 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 14:16:33,564 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:16:33,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:16:33,572 INFO L93 Difference]: Finished difference Result 65 states and 88 transitions. [2020-07-21 14:16:33,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-07-21 14:16:33,574 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 34 [2020-07-21 14:16:33,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:16:33,575 INFO L225 Difference]: With dead ends: 65 [2020-07-21 14:16:33,575 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 14:16:33,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=1942, Invalid=4064, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 14:16:33,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 14:16:33,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-21 14:16:33,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 14:16:33,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-21 14:16:33,603 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-21 14:16:33,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:16:33,604 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-21 14:16:33,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-21 14:16:33,604 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-21 14:16:33,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 14:16:33,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:16:33,606 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:16:33,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:33,820 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:16:33,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:16:33,820 INFO L82 PathProgramCache]: Analyzing trace with hash -765796787, now seen corresponding path program 5 times [2020-07-21 14:16:33,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:16:33,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165099067] [2020-07-21 14:16:33,821 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:33,914 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:16:33,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:16:33,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-21 14:16:33,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:16:36,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:36,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:16:36,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:16:41,356 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:16:41,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165099067] [2020-07-21 14:16:41,356 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:16:41,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 99 [2020-07-21 14:16:41,357 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391166892] [2020-07-21 14:16:41,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-21 14:16:41,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:16:41,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-21 14:16:41,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2407, Invalid=7295, Unknown=0, NotChecked=0, Total=9702 [2020-07-21 14:16:41,362 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 99 states. [2020-07-21 14:16:44,550 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 14:16:45,855 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 14:16:46,773 WARN L193 SmtUtils]: Spent 741.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-21 14:16:48,083 WARN L193 SmtUtils]: Spent 428.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 14:16:49,036 WARN L193 SmtUtils]: Spent 763.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-21 14:16:50,193 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-21 14:16:51,356 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-21 14:16:52,500 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 14:16:53,622 WARN L193 SmtUtils]: Spent 369.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-21 14:16:54,755 WARN L193 SmtUtils]: Spent 360.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 14:16:55,845 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 14:16:56,930 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 14:16:58,014 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-21 14:16:59,025 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-21 14:17:00,018 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-21 14:17:00,990 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 14:17:01,925 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 14:17:02,847 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-21 14:17:03,770 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-21 14:17:04,651 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-21 14:17:05,527 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-21 14:17:06,405 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-21 14:17:07,234 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 14:17:08,033 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-21 14:17:08,836 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 14:17:09,605 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-21 14:17:10,360 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 14:17:11,115 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:17:11,834 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:17:12,524 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 14:17:13,202 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 14:17:13,915 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 14:17:14,513 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 14:17:15,124 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 14:17:15,697 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 14:17:16,245 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 14:17:16,768 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 14:17:17,280 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 14:17:22,829 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 14:17:22,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:22,846 INFO L93 Difference]: Finished difference Result 113 states and 160 transitions. [2020-07-21 14:17:22,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2020-07-21 14:17:22,848 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 58 [2020-07-21 14:17:22,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:22,850 INFO L225 Difference]: With dead ends: 113 [2020-07-21 14:17:22,850 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 14:17:22,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1540 ImplicationChecksByTransitivity, 45.6s TimeCoverageRelationStatistics Valid=7318, Invalid=15032, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 14:17:22,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 14:17:22,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-21 14:17:22,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 14:17:22,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-21 14:17:22,882 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-21 14:17:22,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:22,882 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-21 14:17:22,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-21 14:17:22,882 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-21 14:17:22,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 14:17:22,886 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:22,886 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:23,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:23,102 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:23,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:23,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1152480077, now seen corresponding path program 6 times [2020-07-21 14:17:23,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:23,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324336711] [2020-07-21 14:17:23,105 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:23,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:23,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:23,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-21 14:17:23,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:33,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:17:33,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:33,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:06,351 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:06,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324336711] [2020-07-21 14:18:06,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:06,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 99] total 195 [2020-07-21 14:18:06,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116590450] [2020-07-21 14:18:06,354 INFO L459 AbstractCegarLoop]: Interpolant automaton has 195 states [2020-07-21 14:18:06,354 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:06,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2020-07-21 14:18:06,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9415, Invalid=28415, Unknown=0, NotChecked=0, Total=37830 [2020-07-21 14:18:06,362 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 195 states. [2020-07-21 14:18:32,003 WARN L193 SmtUtils]: Spent 2.22 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-21 14:18:45,230 WARN L193 SmtUtils]: Spent 2.29 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-21 14:18:49,697 WARN L193 SmtUtils]: Spent 3.75 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-21 14:19:04,086 WARN L193 SmtUtils]: Spent 2.47 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-21 14:19:08,915 WARN L193 SmtUtils]: Spent 4.05 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-21 14:19:24,390 WARN L193 SmtUtils]: Spent 2.63 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-21 14:19:40,922 WARN L193 SmtUtils]: Spent 2.78 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-21 14:19:58,412 WARN L193 SmtUtils]: Spent 2.91 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-21 14:20:17,467 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-21 14:20:37,084 WARN L193 SmtUtils]: Spent 3.14 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-21 14:20:57,805 WARN L193 SmtUtils]: Spent 3.27 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-21 14:21:19,003 WARN L193 SmtUtils]: Spent 3.36 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-21 14:21:41,332 WARN L193 SmtUtils]: Spent 3.42 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-21 14:22:04,253 WARN L193 SmtUtils]: Spent 3.50 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 14:22:27,701 WARN L193 SmtUtils]: Spent 3.53 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-21 14:22:52,090 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-21 14:23:16,977 WARN L193 SmtUtils]: Spent 3.66 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-21 14:23:41,726 WARN L193 SmtUtils]: Spent 3.65 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-21 14:24:06,691 WARN L193 SmtUtils]: Spent 3.70 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-21 14:24:31,842 WARN L193 SmtUtils]: Spent 3.69 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-21 14:24:57,259 WARN L193 SmtUtils]: Spent 3.71 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 14:25:22,956 WARN L193 SmtUtils]: Spent 3.73 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-21 14:25:48,751 WARN L193 SmtUtils]: Spent 3.71 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 14:26:12,266 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-21 14:26:37,810 WARN L193 SmtUtils]: Spent 4.01 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 14:27:05,555 WARN L193 SmtUtils]: Spent 4.04 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-21 14:27:32,585 WARN L193 SmtUtils]: Spent 3.44 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-21 14:27:56,210 WARN L193 SmtUtils]: Spent 3.25 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-21 14:28:21,918 WARN L193 SmtUtils]: Spent 3.05 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 14:28:39,238 WARN L193 SmtUtils]: Spent 2.93 s on a formula simplification that was a NOOP. DAG size: 347 [2020-07-21 14:28:57,831 WARN L193 SmtUtils]: Spent 2.64 s on a formula simplification that was a NOOP. DAG size: 342 [2020-07-21 14:29:15,472 WARN L193 SmtUtils]: Spent 3.07 s on a formula simplification that was a NOOP. DAG size: 337 [2020-07-21 14:29:35,541 WARN L193 SmtUtils]: Spent 3.01 s on a formula simplification that was a NOOP. DAG size: 332 [2020-07-21 14:29:55,903 WARN L193 SmtUtils]: Spent 3.00 s on a formula simplification that was a NOOP. DAG size: 327 [2020-07-21 14:30:15,294 WARN L193 SmtUtils]: Spent 2.60 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-21 14:30:34,157 WARN L193 SmtUtils]: Spent 2.99 s on a formula simplification that was a NOOP. DAG size: 317