/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.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:16:59,418 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:16:59,421 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:16:59,443 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:16:59,443 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:16:59,445 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:16:59,447 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:16:59,461 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:16:59,462 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:16:59,463 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:16:59,465 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:16:59,467 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:16:59,467 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:16:59,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:16:59,473 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:16:59,474 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:16:59,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:16:59,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:16:59,479 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:16:59,485 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:16:59,487 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:16:59,490 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:16:59,491 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:16:59,492 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:16:59,496 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:16:59,505 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:16:59,506 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:16:59,507 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:16:59,507 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 14:16:59,521 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:16:59,521 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:16:59,523 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:16:59,523 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:16:59,523 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:16:59,523 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:16:59,523 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:16:59,524 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:16:59,524 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:16:59,524 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:16:59,524 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:16:59,524 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:16:59,525 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:16:59,525 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:16:59,525 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:16:59,525 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:16:59,525 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:16:59,526 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:16:59,526 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:16:59,526 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:16:59,526 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:16:59,526 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:16:59,527 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:16:59,527 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:16:59,527 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:16:59,527 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:16:59,527 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:16:59,528 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:16:59,528 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:16:59,528 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 14:16:59,833 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:16:59,847 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:16:59,850 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:16:59,852 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:16:59,852 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:16:59,853 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-21 14:16:59,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e5a1287b/aaeff5da8dbc481eb1a1157ae832a0e8/FLAG56f62b67e [2020-07-21 14:17:00,400 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:17:00,401 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-21 14:17:00,408 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e5a1287b/aaeff5da8dbc481eb1a1157ae832a0e8/FLAG56f62b67e [2020-07-21 14:17:00,769 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e5a1287b/aaeff5da8dbc481eb1a1157ae832a0e8 [2020-07-21 14:17:00,780 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:17:00,783 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:17:00,784 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:17:00,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:17:00,789 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:17:00,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:17:00" (1/1) ... [2020-07-21 14:17:00,793 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d4dbc2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:00, skipping insertion in model container [2020-07-21 14:17:00,794 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:17:00" (1/1) ... [2020-07-21 14:17:00,803 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:17:00,826 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:17:01,044 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:17:01,049 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:17:01,067 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:17:01,082 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:17:01,083 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01 WrapperNode [2020-07-21 14:17:01,083 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:17:01,084 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:17:01,084 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:17:01,084 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:17:01,099 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,099 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,105 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,105 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,110 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,115 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,116 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (1/1) ... [2020-07-21 14:17:01,240 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:17:01,241 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:17:01,241 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:17:01,241 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:17:01,242 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (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 14:17:01,315 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:17:01,315 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:17:01,315 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:17:01,315 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:17:01,316 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:17:01,316 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:17:01,316 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:17:01,317 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:17:01,317 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:17:01,318 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:17:01,318 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:17:01,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:17:01,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:17:01,513 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:17:01,513 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:17:01,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:17:01 BoogieIcfgContainer [2020-07-21 14:17:01,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:17:01,519 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:17:01,519 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:17:01,522 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:17:01,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:17:00" (1/3) ... [2020-07-21 14:17:01,523 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f39d61d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:17:01, skipping insertion in model container [2020-07-21 14:17:01,523 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:17:01" (2/3) ... [2020-07-21 14:17:01,524 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f39d61d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:17:01, skipping insertion in model container [2020-07-21 14:17:01,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:17:01" (3/3) ... [2020-07-21 14:17:01,526 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.i [2020-07-21 14:17:01,536 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:17:01,541 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:17:01,555 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:17:01,582 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:17:01,582 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:17:01,582 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:17:01,582 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:17:01,583 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:17:01,583 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:17:01,583 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:17:01,583 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:17:01,601 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 14:17:01,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:17:01,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:01,607 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:01,608 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:01,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:01,614 INFO L82 PathProgramCache]: Analyzing trace with hash -42161200, now seen corresponding path program 1 times [2020-07-21 14:17:01,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:01,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927837910] [2020-07-21 14:17:01,623 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 14:17:01,694 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:01,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:01,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 14:17:01,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:01,811 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 14:17:01,848 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 14:17:01,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:17:01,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927837910] [2020-07-21 14:17:01,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:17:01,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 14:17:01,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335088623] [2020-07-21 14:17:01,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 14:17:01,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:01,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 14:17:01,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 14:17:01,875 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 7 states. [2020-07-21 14:17:02,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:02,093 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2020-07-21 14:17:02,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 14:17:02,095 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-07-21 14:17:02,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:02,104 INFO L225 Difference]: With dead ends: 46 [2020-07-21 14:17:02,104 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 14:17:02,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 14:17:02,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 14:17:02,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 14:17:02,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 14:17:02,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 14:17:02,149 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 14:17:02,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:02,150 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 14:17:02,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 14:17:02,151 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 14:17:02,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 14:17:02,151 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:02,152 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:02,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:02,361 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:02,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:02,363 INFO L82 PathProgramCache]: Analyzing trace with hash 219103455, now seen corresponding path program 1 times [2020-07-21 14:17:02,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:02,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1230305519] [2020-07-21 14:17:02,365 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 14:17:02,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:02,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:02,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 14:17:02,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:02,496 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 14:17:02,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:02,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:02,605 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 14:17:02,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1230305519] [2020-07-21 14:17:02,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:02,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 14:17:02,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893211844] [2020-07-21 14:17:02,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 14:17:02,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:02,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 14:17:02,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 14:17:02,610 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 11 states. [2020-07-21 14:17:02,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:02,841 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-07-21 14:17:02,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 14:17:02,841 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 13 [2020-07-21 14:17:02,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:02,842 INFO L225 Difference]: With dead ends: 25 [2020-07-21 14:17:02,843 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 14:17:02,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:17:02,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 14:17:02,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 14:17:02,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 14:17:02,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 14:17:02,850 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-21 14:17:02,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:02,851 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 14:17:02,851 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 14:17:02,851 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 14:17:02,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 14:17:02,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:02,852 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:03,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:03,067 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:03,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:03,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1744767088, now seen corresponding path program 2 times [2020-07-21 14:17:03,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:03,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363289218] [2020-07-21 14:17:03,070 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 14:17:03,098 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:03,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:03,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 14:17:03,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:03,233 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 14:17:03,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:03,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:03,403 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 14:17:03,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363289218] [2020-07-21 14:17:03,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:03,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-21 14:17:03,404 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489724648] [2020-07-21 14:17:03,405 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 14:17:03,405 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:03,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 14:17:03,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:17:03,406 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2020-07-21 14:17:03,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:03,919 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-07-21 14:17:03,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 14:17:03,919 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-07-21 14:17:03,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:03,921 INFO L225 Difference]: With dead ends: 31 [2020-07-21 14:17:03,921 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 14:17:03,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=188, Invalid=514, Unknown=0, NotChecked=0, Total=702 [2020-07-21 14:17:03,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 14:17:03,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 14:17:03,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 14:17:03,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-21 14:17:03,930 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-21 14:17:03,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:03,930 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-21 14:17:03,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 14:17:03,931 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-21 14:17:03,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 14:17:03,932 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:03,932 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:04,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:04,146 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:04,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:04,148 INFO L82 PathProgramCache]: Analyzing trace with hash -1040440016, now seen corresponding path program 3 times [2020-07-21 14:17:04,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:04,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916040752] [2020-07-21 14:17:04,150 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 14:17:04,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:04,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:04,196 WARN L261 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 14:17:04,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:04,435 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 14:17:04,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:04,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:04,960 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 14:17:04,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916040752] [2020-07-21 14:17:04,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:04,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 29 [2020-07-21 14:17:04,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168531171] [2020-07-21 14:17:04,962 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 14:17:04,962 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:04,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 14:17:04,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2020-07-21 14:17:04,964 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 29 states. [2020-07-21 14:17:05,487 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-21 14:17:05,744 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2020-07-21 14:17:06,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:06,638 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2020-07-21 14:17:06,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 14:17:06,639 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2020-07-21 14:17:06,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:06,640 INFO L225 Difference]: With dead ends: 43 [2020-07-21 14:17:06,640 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 14:17:06,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=560, Invalid=1420, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 14:17:06,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 14:17:06,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 14:17:06,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 14:17:06,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-21 14:17:06,650 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-21 14:17:06,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:06,651 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-21 14:17:06,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 14:17:06,651 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-21 14:17:06,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 14:17:06,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:06,652 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:06,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:06,867 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:06,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:06,868 INFO L82 PathProgramCache]: Analyzing trace with hash -276146064, now seen corresponding path program 4 times [2020-07-21 14:17:06,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:06,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [183817289] [2020-07-21 14:17:06,870 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 14:17:06,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:06,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:06,921 WARN L261 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 14:17:06,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:07,620 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 14:17:07,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:07,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:09,047 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 14:17:09,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [183817289] [2020-07-21 14:17:09,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:09,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 53 [2020-07-21 14:17:09,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603408516] [2020-07-21 14:17:09,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 14:17:09,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:09,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 14:17:09,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=2119, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 14:17:09,051 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 53 states. [2020-07-21 14:17:09,961 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 14:17:10,328 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-21 14:17:10,650 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:17:10,972 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 97 [2020-07-21 14:17:11,269 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:17:11,625 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 14:17:11,902 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 14:17:12,179 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 14:17:12,457 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 14:17:12,726 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 14:17:15,639 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:17:15,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:15,660 INFO L93 Difference]: Finished difference Result 67 states and 90 transitions. [2020-07-21 14:17:15,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 14:17:15,661 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 34 [2020-07-21 14:17:15,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:15,663 INFO L225 Difference]: With dead ends: 67 [2020-07-21 14:17:15,663 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 14:17:15,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=1952, Invalid=4528, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 14:17:15,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 14:17:15,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-21 14:17:15,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 14:17:15,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-21 14:17:15,684 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-21 14:17:15,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:15,685 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-21 14:17:15,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 14:17:15,685 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-21 14:17:15,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 14:17:15,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:15,688 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:15,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:15,898 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:15,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:15,899 INFO L82 PathProgramCache]: Analyzing trace with hash -2111955216, now seen corresponding path program 5 times [2020-07-21 14:17:15,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:15,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743315118] [2020-07-21 14:17:15,901 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 14:17:15,967 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:15,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:15,972 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-21 14:17:15,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:17:18,150 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 14:17:18,150 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:17:18,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:17:23,678 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 14:17:23,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743315118] [2020-07-21 14:17:23,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:17:23,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 101 [2020-07-21 14:17:23,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168636616] [2020-07-21 14:17:23,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 14:17:23,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:17:23,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 14:17:23,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2413, Invalid=7687, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 14:17:23,689 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 101 states. [2020-07-21 14:17:26,914 WARN L193 SmtUtils]: Spent 405.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 14:17:27,878 WARN L193 SmtUtils]: Spent 721.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-21 14:17:29,137 WARN L193 SmtUtils]: Spent 421.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 14:17:30,039 WARN L193 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 193 [2020-07-21 14:17:31,248 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 14:17:32,629 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-21 14:17:33,805 WARN L193 SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-21 14:17:34,968 WARN L193 SmtUtils]: Spent 377.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 14:17:36,107 WARN L193 SmtUtils]: Spent 370.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-21 14:17:37,229 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 14:17:38,309 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 14:17:39,391 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 14:17:40,425 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-21 14:17:41,448 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-21 14:17:42,456 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-21 14:17:43,407 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 14:17:44,364 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 14:17:45,289 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-21 14:17:46,184 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-21 14:17:47,076 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-21 14:17:47,941 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-21 14:17:48,774 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-21 14:17:49,625 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 14:17:50,432 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-21 14:17:51,222 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 14:17:51,989 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-21 14:17:52,741 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 14:17:53,460 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 14:17:54,179 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:17:54,866 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 14:17:55,533 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 14:17:56,168 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 14:17:56,795 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 14:17:57,396 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 14:17:57,962 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 14:17:58,515 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 14:17:59,041 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 14:18:05,038 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 14:18:05,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:18:05,059 INFO L93 Difference]: Finished difference Result 115 states and 162 transitions. [2020-07-21 14:18:05,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 14:18:05,061 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 58 [2020-07-21 14:18:05,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:18:05,062 INFO L225 Difference]: With dead ends: 115 [2020-07-21 14:18:05,063 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 14:18:05,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 45.8s TimeCoverageRelationStatistics Valid=7328, Invalid=15928, Unknown=0, NotChecked=0, Total=23256 [2020-07-21 14:18:05,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 14:18:05,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-21 14:18:05,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 14:18:05,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-21 14:18:05,097 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-21 14:18:05,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:18:05,098 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-21 14:18:05,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 14:18:05,098 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-21 14:18:05,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 14:18:05,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:18:05,100 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:18:05,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:18:05,315 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:18:05,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:18:05,316 INFO L82 PathProgramCache]: Analyzing trace with hash -236770320, now seen corresponding path program 6 times [2020-07-21 14:18:05,317 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:18:05,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170182910] [2020-07-21 14:18:05,318 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 14:18:05,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:18:05,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:18:05,463 WARN L261 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-21 14:18:05,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:15,613 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 14:18:15,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:16,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:18:50,530 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 14:18:50,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170182910] [2020-07-21 14:18:50,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:18:50,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 197 [2020-07-21 14:18:50,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951478502] [2020-07-21 14:18:50,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 197 states [2020-07-21 14:18:50,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:18:50,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2020-07-21 14:18:50,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9421, Invalid=29191, Unknown=0, NotChecked=0, Total=38612 [2020-07-21 14:18:50,542 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 197 states. [2020-07-21 14:19:19,548 WARN L193 SmtUtils]: Spent 2.34 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-21 14:19:24,377 WARN L193 SmtUtils]: Spent 3.80 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-21 14:19:39,813 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-21 14:19:44,441 WARN L193 SmtUtils]: Spent 3.92 s on a formula simplification. DAG size of input: 479 DAG size of output: 385 [2020-07-21 14:19:58,920 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-21 14:20:15,950 WARN L193 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-21 14:20:31,238 WARN L193 SmtUtils]: Spent 2.86 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-21 14:20:49,455 WARN L193 SmtUtils]: Spent 2.61 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-21 14:21:08,289 WARN L193 SmtUtils]: Spent 3.24 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-21 14:21:27,178 WARN L193 SmtUtils]: Spent 3.27 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-21 14:21:47,314 WARN L193 SmtUtils]: Spent 3.37 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-21 14:22:08,269 WARN L193 SmtUtils]: Spent 3.10 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-21 14:22:30,755 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-21 14:22:53,444 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 14:23:16,922 WARN L193 SmtUtils]: Spent 3.76 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-21 14:23:40,584 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-21 14:24:05,994 WARN L193 SmtUtils]: Spent 3.88 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-21 14:24:31,123 WARN L193 SmtUtils]: Spent 3.36 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-21 14:24:58,007 WARN L193 SmtUtils]: Spent 3.94 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-21 14:25:25,149 WARN L193 SmtUtils]: Spent 4.11 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-21 14:25:51,894 WARN L193 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 14:26:19,342 WARN L193 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-21 14:26:47,198 WARN L193 SmtUtils]: Spent 4.14 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 14:27:15,566 WARN L193 SmtUtils]: Spent 3.77 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-21 14:27:43,340 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 14:28:03,610 WARN L193 SmtUtils]: Spent 3.23 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-21 14:28:25,071 WARN L193 SmtUtils]: Spent 3.22 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-21 14:28:46,834 WARN L193 SmtUtils]: Spent 3.25 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-21 14:29:08,768 WARN L193 SmtUtils]: Spent 2.91 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 14:29:31,438 WARN L193 SmtUtils]: Spent 3.09 s on a formula simplification that was a NOOP. DAG size: 347 [2020-07-21 14:29:53,743 WARN L193 SmtUtils]: Spent 3.26 s on a formula simplification that was a NOOP. DAG size: 342 [2020-07-21 14:30:15,872 WARN L193 SmtUtils]: Spent 3.22 s on a formula simplification that was a NOOP. DAG size: 337 [2020-07-21 14:30:38,138 WARN L193 SmtUtils]: Spent 3.25 s on a formula simplification that was a NOOP. DAG size: 332 [2020-07-21 14:31:00,227 WARN L193 SmtUtils]: Spent 2.88 s on a formula simplification that was a NOOP. DAG size: 327 [2020-07-21 14:31:22,857 WARN L193 SmtUtils]: Spent 3.00 s on a formula simplification that was a NOOP. DAG size: 322