/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 DAGSIZE --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/recursive-simple/fibo_15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:29:49,473 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:29:49,476 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:29:49,489 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:29:49,489 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:29:49,491 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:29:49,492 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:29:49,494 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:29:49,495 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:29:49,496 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:29:49,497 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:29:49,498 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:29:49,498 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:29:49,499 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:29:49,500 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:29:49,501 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:29:49,502 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:29:49,503 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:29:49,505 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:29:49,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:29:49,509 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:29:49,513 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:29:49,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:29:49,517 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:29:49,519 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:29:49,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:29:49,536 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:29:49,537 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:29:49,538 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 19:29:49,563 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:29:49,564 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:29:49,567 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:29:49,567 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:29:49,568 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:29:49,568 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:29:49,568 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:29:49,568 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:29:49,568 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:29:49,569 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:29:49,570 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:29:49,570 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:29:49,570 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:29:49,571 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:29:49,571 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:29:49,571 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:29:49,571 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:29:49,571 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:29:49,572 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:29:49,572 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:29:49,572 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:29:49,572 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:29:49,572 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:29:49,572 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:29:49,573 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:29:49,573 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:29:49,573 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:49,573 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:29:49,573 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:29:49,574 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 -> DAGSIZE 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 19:29:49,871 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:29:49,885 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:29:49,888 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:29:49,890 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:29:49,890 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:29:49,891 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 19:29:49,975 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8b6f99aa/d9f255aa5d8141e39abe56b745edfe78/FLAGc3d496fd2 [2020-07-21 19:29:50,366 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:29:50,367 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c [2020-07-21 19:29:50,374 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8b6f99aa/d9f255aa5d8141e39abe56b745edfe78/FLAGc3d496fd2 [2020-07-21 19:29:50,810 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e8b6f99aa/d9f255aa5d8141e39abe56b745edfe78 [2020-07-21 19:29:50,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:29:50,827 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:29:50,832 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:29:50,833 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:29:50,836 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:29:50,838 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:29:50" (1/1) ... [2020-07-21 19:29:50,841 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29bc61ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:50, skipping insertion in model container [2020-07-21 19:29:50,841 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:29:50" (1/1) ... [2020-07-21 19:29:50,848 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:29:50,863 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:29:51,022 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:29:51,027 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:29:51,044 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:29:51,059 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:29:51,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51 WrapperNode [2020-07-21 19:29:51,060 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:29:51,061 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:29:51,061 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:29:51,061 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:29:51,077 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,077 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,083 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,084 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,088 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,091 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (1/1) ... [2020-07-21 19:29:51,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:29:51,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:29:51,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:29:51,094 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:29:51,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (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 19:29:51,301 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:29:51,302 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:29:51,302 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:29:51,302 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:29:51,303 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:29:51,304 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:29:51,304 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:29:51,304 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:29:51,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:29:51,305 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:29:51,509 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:29:51,510 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:29:51,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:29:51 BoogieIcfgContainer [2020-07-21 19:29:51,514 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:29:51,516 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:29:51,516 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:29:51,520 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:29:51,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:29:50" (1/3) ... [2020-07-21 19:29:51,521 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df237c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:29:51, skipping insertion in model container [2020-07-21 19:29:51,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:29:51" (2/3) ... [2020-07-21 19:29:51,522 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7df237c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:29:51, skipping insertion in model container [2020-07-21 19:29:51,522 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:29:51" (3/3) ... [2020-07-21 19:29:51,524 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-2.c [2020-07-21 19:29:51,536 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:29:51,545 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:29:51,567 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:29:51,597 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:29:51,598 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:29:51,598 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:29:51,598 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:29:51,598 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:29:51,599 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:29:51,599 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:29:51,599 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:29:51,637 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:29:51,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:29:51,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:51,663 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:51,663 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:51,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:51,683 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:29:51,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:51,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [958362418] [2020-07-21 19:29:51,709 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 19:29:51,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:29:51,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:51,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:29:51,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:51,992 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 19:29:51,993 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:29:51,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [958362418] [2020-07-21 19:29:51,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:29:51,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:29:51,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630520459] [2020-07-21 19:29:52,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:29:52,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:52,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:29:52,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:29:52,025 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:29:52,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:52,142 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:29:52,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:29:52,144 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:29:52,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:52,156 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:29:52,156 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:29:52,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:29:52,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:29:52,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:29:52,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:29:52,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:29:52,211 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:29:52,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:52,212 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:29:52,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:29:52,212 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:29:52,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:29:52,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:52,215 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:52,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:52,429 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:52,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:52,430 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:29:52,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:52,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [301660329] [2020-07-21 19:29:52,432 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 19:29:52,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:29:52,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:52,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:29:52,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:52,487 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 19:29:52,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:29:52,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [301660329] [2020-07-21 19:29:52,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:29:52,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:29:52,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729416105] [2020-07-21 19:29:52,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:29:52,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:52,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:29:52,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:29:52,493 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:29:52,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:52,595 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:29:52,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:29:52,598 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:29:52,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:52,600 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:29:52,600 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:29:52,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:29:52,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:29:52,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:29:52,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:29:52,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:29:52,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:29:52,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:52,619 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:29:52,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:29:52,619 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:29:52,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:29:52,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:52,625 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:52,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:52,838 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:52,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:52,840 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:29:52,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:52,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554064252] [2020-07-21 19:29:52,842 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 19:29:52,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:29:52,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:52,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:29:52,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:52,962 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:29:52,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:53,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:53,176 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:29:53,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554064252] [2020-07-21 19:29:53,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:53,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:29:53,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203972844] [2020-07-21 19:29:53,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:29:53,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:53,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:29:53,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:29:53,180 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:29:53,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:53,283 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:29:53,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:29:53,284 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:29:53,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:53,286 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:29:53,286 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:29:53,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:29:53,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:29:53,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:29:53,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:29:53,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:29:53,296 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:29:53,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:53,297 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:29:53,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:29:53,297 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:29:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:29:53,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:53,299 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:53,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:53,510 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:53,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:53,511 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:29:53,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:53,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263075060] [2020-07-21 19:29:53,512 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 19:29:53,539 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:29:53,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:53,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:29:53,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:53,587 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:29:53,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:53,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:53,751 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:29:53,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263075060] [2020-07-21 19:29:53,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:53,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:29:53,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1541383942] [2020-07-21 19:29:53,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:29:53,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:53,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:29:53,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:29:53,754 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:29:53,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:53,837 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:29:53,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:29:53,838 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:29:53,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:53,841 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:29:53,841 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:29:53,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:29:53,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:29:53,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:29:53,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:29:53,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:29:53,851 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:29:53,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:53,851 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:29:53,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:29:53,852 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:29:53,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:29:53,853 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:53,854 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:54,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:54,069 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:54,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:54,070 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:29:54,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:54,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703741217] [2020-07-21 19:29:54,071 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 19:29:54,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:54,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:54,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:29:54,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:29:54,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:54,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:54,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:54,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:54,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:54,505 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:29:54,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703741217] [2020-07-21 19:29:54,506 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:54,506 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:29:54,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573122474] [2020-07-21 19:29:54,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:29:54,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:54,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:29:54,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:29:54,508 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:29:54,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:54,679 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:29:54,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:29:54,679 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:29:54,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:54,681 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:29:54,682 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:29:54,682 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:29:54,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:29:54,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:29:54,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:29:54,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:29:54,693 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:29:54,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:54,693 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:29:54,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:29:54,693 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:29:54,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:29:54,696 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:54,696 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:54,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:54,910 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:54,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:54,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:29:54,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:54,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38732166] [2020-07-21 19:29:54,913 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 19:29:54,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:54,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:54,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:29:54,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:55,004 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:29:55,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:55,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:55,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:55,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:55,317 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:29:55,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38732166] [2020-07-21 19:29:55,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:55,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:29:55,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472848481] [2020-07-21 19:29:55,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:29:55,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:55,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:29:55,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:29:55,320 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:29:55,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:55,472 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:29:55,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:29:55,473 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:29:55,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:55,477 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:29:55,477 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:29:55,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:29:55,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:29:55,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:29:55,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:29:55,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:29:55,503 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:29:55,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:55,503 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:29:55,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:29:55,504 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:29:55,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:29:55,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:55,508 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:55,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:55,724 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:55,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:55,725 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:29:55,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:55,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900599570] [2020-07-21 19:29:55,726 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 19:29:55,774 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:55,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:55,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:29:55,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:55,828 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:29:55,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:56,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:56,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:56,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:56,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:56,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:29:56,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900599570] [2020-07-21 19:29:56,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:56,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:29:56,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211346087] [2020-07-21 19:29:56,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:29:56,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:56,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:29:56,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:29:56,473 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:29:56,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:56,661 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:29:56,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:29:56,661 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:29:56,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:56,667 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:29:56,667 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:29:56,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:29:56,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:29:56,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:29:56,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:29:56,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:29:56,696 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:29:56,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:56,697 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:29:56,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:29:56,699 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:29:56,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:29:56,704 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:56,704 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:56,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:56,906 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:56,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:56,906 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:29:56,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:56,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953944592] [2020-07-21 19:29:56,907 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:56,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:56,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:56,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:29:56,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:57,058 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:29:57,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:57,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:57,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:57,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:57,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:57,676 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:29:57,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953944592] [2020-07-21 19:29:57,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:57,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:29:57,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333184979] [2020-07-21 19:29:57,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:29:57,679 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:57,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:29:57,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:29:57,679 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:29:57,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:57,831 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:29:57,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:29:57,833 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:29:57,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:57,835 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:29:57,835 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:29:57,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:29:57,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:29:57,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:29:57,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:29:57,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:29:57,851 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:29:57,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:57,852 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:29:57,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:29:57,852 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:29:57,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:29:57,854 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:57,855 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:58,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:58,069 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:58,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:58,070 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:29:58,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:58,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176114735] [2020-07-21 19:29:58,071 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:58,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:58,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:58,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:29:58,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:58,221 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:29:58,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:29:58,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:58,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:59,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:59,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:59,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:59,185 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:29:59,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176114735] [2020-07-21 19:29:59,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:59,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:29:59,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247135620] [2020-07-21 19:29:59,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:29:59,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:59,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:29:59,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:29:59,188 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:29:59,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:59,481 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:29:59,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:29:59,482 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:29:59,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:59,484 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:29:59,484 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:29:59,485 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:29:59,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:29:59,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:29:59,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:29:59,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:29:59,498 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:29:59,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:59,499 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:29:59,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:29:59,499 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:29:59,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:29:59,502 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:59,502 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:59,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:59,718 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:59,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:59,719 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:29:59,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:59,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327592876] [2020-07-21 19:29:59,720 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:59,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:59,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:59,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:29:59,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:29:59,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:29:59,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:00,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:00,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:00,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:00,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:00,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:00,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:01,037 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:30:01,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327592876] [2020-07-21 19:30:01,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:01,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:30:01,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834093198] [2020-07-21 19:30:01,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:30:01,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:01,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:30:01,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:01,040 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:30:01,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:01,200 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:30:01,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:01,200 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:30:01,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:01,203 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:30:01,204 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:30:01,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:30:01,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:30:01,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:30:01,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:30:01,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:30:01,216 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:30:01,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:01,217 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:30:01,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:30:01,217 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:30:01,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:30:01,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:01,222 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:01,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:01,435 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:01,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:01,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:30:01,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:01,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1944510996] [2020-07-21 19:30:01,436 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:01,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:01,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:01,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:01,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:01,692 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:30:01,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:02,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:03,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:30:03,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1944510996] [2020-07-21 19:30:03,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:03,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:03,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264836633] [2020-07-21 19:30:03,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:03,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:03,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:03,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:03,621 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:30:03,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:03,843 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:30:03,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:03,843 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:30:03,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:03,846 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:30:03,846 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:30:03,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:30:03,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:30:03,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:30:03,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:03,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:03,875 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:30:03,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:03,877 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:03,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:03,877 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:03,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 19:30:03,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:03,884 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:04,097 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:04,098 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:04,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:04,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 19:30:04,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:04,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037842040] [2020-07-21 19:30:04,100 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:04,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:04,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:04,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:04,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:04,405 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 19:30:04,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:05,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:06,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 19:30:06,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037842040] [2020-07-21 19:30:06,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:06,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:06,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149724325] [2020-07-21 19:30:06,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:06,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:06,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:06,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:06,418 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 19:30:06,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:06,666 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:30:06,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:06,666 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 19:30:06,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:06,674 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:30:06,675 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:30:06,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:30:06,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:30:06,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:30:06,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:06,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:06,699 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 19:30:06,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:06,700 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:06,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:06,701 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:06,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 19:30:06,713 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:06,713 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:06,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:06,928 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:06,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:06,928 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 19:30:06,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:06,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238209207] [2020-07-21 19:30:06,929 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:07,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:07,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:07,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:07,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:07,334 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 19:30:07,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:09,297 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:09,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:10,548 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 19:30:10,549 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238209207] [2020-07-21 19:30:10,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:10,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:10,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333303447] [2020-07-21 19:30:10,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:10,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:10,551 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:10,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:10,551 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 19:30:10,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:10,890 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:30:10,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:10,891 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 19:30:10,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:10,895 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:30:10,895 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:30:10,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:30:10,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:30:10,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:30:10,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:10,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:10,908 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 19:30:10,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:10,909 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:10,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:10,909 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:10,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 19:30:10,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:10,913 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:11,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:11,126 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:11,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:11,126 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 19:30:11,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:11,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178158968] [2020-07-21 19:30:11,127 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:11,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:11,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:11,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:11,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:11,538 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 19:30:11,539 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:13,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:13,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:13,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,719 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 19:30:14,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178158968] [2020-07-21 19:30:14,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:14,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:14,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767912471] [2020-07-21 19:30:14,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:14,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:14,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:14,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:14,722 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 19:30:15,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,191 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 19:30:15,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:15,192 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 19:30:15,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,199 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:30:15,200 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 19:30:15,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:30:15,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 19:30:15,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 19:30:15,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:15,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:15,232 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 19:30:15,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,233 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:15,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:15,233 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:15,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 19:30:15,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,243 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:15,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,457 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:15,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:15,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 19:30:15,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:15,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036829117] [2020-07-21 19:30:15,459 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:15,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:15,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:15,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:16,408 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 19:30:16,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:19,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,366 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 19:30:22,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036829117] [2020-07-21 19:30:22,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:22,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:22,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060998652] [2020-07-21 19:30:22,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:22,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:22,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:22,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:22,370 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 19:30:22,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:22,724 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 19:30:22,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:22,725 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 19:30:22,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:22,730 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:30:22,730 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:30:22,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:30:22,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:30:22,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 19:30:22,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:22,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:22,748 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 19:30:22,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:22,751 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:22,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:22,752 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:22,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2020-07-21 19:30:22,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:22,767 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 147, 89, 89, 89, 89, 89, 89, 89, 58, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:22,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,981 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:22,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:22,982 INFO L82 PathProgramCache]: Analyzing trace with hash 104339052, now seen corresponding path program 7 times [2020-07-21 19:30:22,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:22,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [284649147] [2020-07-21 19:30:22,983 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:23,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:23,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:23,474 INFO L263 TraceCheckSpWp]: Trace formula consists of 2728 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:23,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:24,231 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6738 refuted. 0 times theorem prover too weak. 82488 trivial. 0 not checked. [2020-07-21 19:30:24,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:28,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:29,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,929 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6815 refuted. 0 times theorem prover too weak. 82411 trivial. 0 not checked. [2020-07-21 19:30:31,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [284649147] [2020-07-21 19:30:31,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:31,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:31,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353470222] [2020-07-21 19:30:31,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:31,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:31,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:31,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:31,934 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 19:30:32,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:32,583 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 19:30:32,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:32,584 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1228 [2020-07-21 19:30:32,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:32,589 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:30:32,590 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:30:32,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2463 GetRequests, 2420 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:30:32,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:30:32,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 19:30:32,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:32,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:32,610 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1228 [2020-07-21 19:30:32,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:32,612 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:32,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:32,612 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:32,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 19:30:32,643 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:32,644 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:32,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:32,859 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:32,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:32,861 INFO L82 PathProgramCache]: Analyzing trace with hash 621098440, now seen corresponding path program 8 times [2020-07-21 19:30:32,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:32,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [64167476] [2020-07-21 19:30:32,862 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:33,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:33,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:33,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 4352 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:33,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:35,030 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 11918 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 19:30:35,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:42,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:43,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:45,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:46,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:48,249 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 12010 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 19:30:48,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [64167476] [2020-07-21 19:30:48,250 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:48,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:30:48,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495595729] [2020-07-21 19:30:48,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:30:48,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:48,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:30:48,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:30:48,254 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 19:30:48,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:48,764 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 19:30:48,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:30:48,772 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 19:30:48,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:48,777 INFO L225 Difference]: With dead ends: 102 [2020-07-21 19:30:48,777 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 19:30:48,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:30:48,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 19:30:48,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 19:30:48,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:30:48,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:30:48,793 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 19:30:48,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:48,796 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:30:48,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:30:48,796 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:30:48,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1690 [2020-07-21 19:30:48,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:48,820 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 212, 122, 122, 122, 122, 122, 122, 122, 90, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:49,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:49,035 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:49,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:49,035 INFO L82 PathProgramCache]: Analyzing trace with hash 249367267, now seen corresponding path program 8 times [2020-07-21 19:30:49,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:49,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767101799] [2020-07-21 19:30:49,036 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:49,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:49,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:49,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 3749 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:49,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:50,976 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10458 refuted. 0 times theorem prover too weak. 159447 trivial. 0 not checked. [2020-07-21 19:30:50,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:56,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:58,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:58,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:02,798 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10558 refuted. 0 times theorem prover too weak. 159347 trivial. 0 not checked. [2020-07-21 19:31:02,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767101799] [2020-07-21 19:31:02,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:02,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:31:02,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793693848] [2020-07-21 19:31:02,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:02,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:02,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:02,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:02,803 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 19:31:03,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:03,388 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 19:31:03,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:03,389 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1689 [2020-07-21 19:31:03,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:03,395 INFO L225 Difference]: With dead ends: 107 [2020-07-21 19:31:03,396 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 19:31:03,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3338 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:03,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 19:31:03,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 19:31:03,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:31:03,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:31:03,412 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1689 [2020-07-21 19:31:03,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:03,414 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:31:03,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:03,414 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:31:03,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2341 [2020-07-21 19:31:03,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:03,451 INFO L422 BasicCegarLoop]: trace histogram [359, 359, 180, 179, 179, 179, 179, 179, 179, 179, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:03,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:03,652 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:03,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:03,654 INFO L82 PathProgramCache]: Analyzing trace with hash 1393099828, now seen corresponding path program 9 times [2020-07-21 19:31:03,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:03,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325787086] [2020-07-21 19:31:03,655 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:04,563 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:04,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:04,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 5222 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:04,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:07,474 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16027 refuted. 0 times theorem prover too weak. 318381 trivial. 0 not checked. [2020-07-21 19:31:07,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:16,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:20,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:21,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:22,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:22,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:23,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:23,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:26,273 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16144 refuted. 0 times theorem prover too weak. 318264 trivial. 0 not checked. [2020-07-21 19:31:26,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325787086] [2020-07-21 19:31:26,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:26,274 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:31:26,274 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967708814] [2020-07-21 19:31:26,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:31:26,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:26,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:31:26,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:31:26,277 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 19:31:27,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:27,094 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 19:31:27,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:27,097 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2340 [2020-07-21 19:31:27,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:27,103 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:31:27,104 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 19:31:27,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4690 GetRequests, 4637 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:31:27,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 19:31:27,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 19:31:27,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:31:27,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:31:27,122 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2340 [2020-07-21 19:31:27,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:27,124 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:31:27,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:31:27,124 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:31:27,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3057 [2020-07-21 19:31:27,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:27,194 INFO L422 BasicCegarLoop]: trace histogram [447, 447, 367, 223, 223, 223, 223, 223, 223, 223, 144, 80, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:27,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:27,409 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:27,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:27,411 INFO L82 PathProgramCache]: Analyzing trace with hash -1980951758, now seen corresponding path program 9 times [2020-07-21 19:31:27,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:27,411 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [373242332] [2020-07-21 19:31:27,412 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:28,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:28,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:28,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 6786 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:28,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:31,645 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21700 refuted. 0 times theorem prover too weak. 540315 trivial. 0 not checked. [2020-07-21 19:31:31,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:42,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:47,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:51,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:52,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:52,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:52,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:52,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:52,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:53,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:53,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:56,011 INFO L134 CoverageAnalysis]: Checked inductivity of 564897 backedges. 2882 proven. 21826 refuted. 0 times theorem prover too weak. 540189 trivial. 0 not checked. [2020-07-21 19:31:56,012 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [373242332] [2020-07-21 19:31:56,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:56,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:31:56,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253859388] [2020-07-21 19:31:56,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:31:56,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:56,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:31:56,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:31:56,016 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 19:31:56,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:56,896 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 19:31:56,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:56,898 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3056 [2020-07-21 19:31:56,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:56,904 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:31:56,905 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 19:31:56,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6121 GetRequests, 6068 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:31:56,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 19:31:56,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 19:31:56,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:31:56,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:31:56,925 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3056 [2020-07-21 19:31:56,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:56,928 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:31:56,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:31:56,928 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:31:57,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4733 [2020-07-21 19:31:57,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:57,064 INFO L422 BasicCegarLoop]: trace histogram [727, 727, 364, 363, 363, 363, 363, 363, 363, 363, 363, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:57,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:57,265 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:57,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:57,267 INFO L82 PathProgramCache]: Analyzing trace with hash 695057410, now seen corresponding path program 10 times [2020-07-21 19:31:57,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:57,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1001711949] [2020-07-21 19:31:57,268 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:58,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:58,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:58,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 10558 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:31:59,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:06,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36414 refuted. 0 times theorem prover too weak. 1342596 trivial. 0 not checked. [2020-07-21 19:32:06,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:23,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:23,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:32,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:37,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:39,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:41,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:41,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:41,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:52,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1384119 backedges. 5109 proven. 36559 refuted. 0 times theorem prover too weak. 1342451 trivial. 0 not checked. [2020-07-21 19:32:52,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1001711949] [2020-07-21 19:32:52,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:52,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:32:52,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81905085] [2020-07-21 19:32:52,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:32:52,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:52,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:32:52,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:32:52,220 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 19:32:53,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:53,464 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 19:32:53,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:32:53,466 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4732 [2020-07-21 19:32:53,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:53,480 INFO L225 Difference]: With dead ends: 122 [2020-07-21 19:32:53,480 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 19:32:53,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9475 GetRequests, 9417 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:32:53,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 19:32:53,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 19:32:53,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:32:53,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:32:53,512 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4732 [2020-07-21 19:32:53,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:53,515 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:32:53,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:32:53,516 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:32:54,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7737 [2020-07-21 19:32:54,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:54,086 INFO L422 BasicCegarLoop]: trace histogram [1139, 1139, 895, 569, 569, 569, 569, 569, 569, 569, 326, 244, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:54,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:54,295 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:54,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:54,299 INFO L82 PathProgramCache]: Analyzing trace with hash -885154388, now seen corresponding path program 10 times [2020-07-21 19:32:54,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:54,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915882087] [2020-07-21 19:32:54,300 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:57,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:57,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:57,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 17184 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:32:57,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:23,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62742 refuted. 0 times theorem prover too weak. 3569260 trivial. 0 not checked. [2020-07-21 19:33:23,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:55,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:07,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:07,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:13,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:13,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:16,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:16,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:17,007 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:34:17,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:17,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:18,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:18,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:19,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:47,331 INFO L134 CoverageAnalysis]: Checked inductivity of 3638813 backedges. 6811 proven. 62897 refuted. 0 times theorem prover too weak. 3569105 trivial. 0 not checked. [2020-07-21 19:34:47,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915882087] [2020-07-21 19:34:47,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:34:47,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:34:47,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068406421] [2020-07-21 19:34:47,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:34:47,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:34:47,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:34:47,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:34:47,342 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 19:34:48,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:34:48,748 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 19:34:48,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:34:48,752 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7736 [2020-07-21 19:34:48,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:34:48,761 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:34:48,761 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:34:48,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15482 GetRequests, 15424 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:34:48,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:34:48,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 19:34:48,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:34:48,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:34:48,789 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7736 [2020-07-21 19:34:48,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:34:48,794 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:34:48,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:34:48,794 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:34:49,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6631 [2020-07-21 19:34:49,466 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:34:49,471 INFO L422 BasicCegarLoop]: trace histogram [1019, 1019, 510, 509, 509, 509, 509, 509, 509, 509, 509, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:34:49,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:49,686 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:34:49,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:34:49,690 INFO L82 PathProgramCache]: Analyzing trace with hash -629593500, now seen corresponding path program 11 times [2020-07-21 19:34:49,690 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:34:49,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174252997] [2020-07-21 19:34:49,692 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:52,540 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:34:52,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:34:52,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 14792 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:34:52,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:13,471 INFO L134 CoverageAnalysis]: Checked inductivity of 2721114 backedges. 6647 proven. 57292 refuted. 0 times theorem prover too weak. 2657175 trivial. 0 not checked. [2020-07-21 19:35:13,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:51,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:03,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:14,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:14,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:19,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:19,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:22,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:24,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:24,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:25,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:25,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:25,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:26,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:26,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:26,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:26,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:41,417 INFO L134 CoverageAnalysis]: Checked inductivity of 2721114 backedges. 6647 proven. 57468 refuted. 0 times theorem prover too weak. 2656999 trivial. 0 not checked. [2020-07-21 19:36:41,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174252997] [2020-07-21 19:36:41,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:36:41,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:36:41,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667771278] [2020-07-21 19:36:41,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:36:41,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:36:41,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:36:41,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:36:41,428 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 19:36:42,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:36:42,908 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 19:36:42,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:36:42,910 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6630 [2020-07-21 19:36:42,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:36:42,918 INFO L225 Difference]: With dead ends: 132 [2020-07-21 19:36:42,919 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 19:36:42,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13272 GetRequests, 13209 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:36:42,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 19:36:42,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 19:36:42,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:36:42,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:36:42,946 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6630 [2020-07-21 19:36:42,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:36:42,951 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:36:42,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:36:42,951 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:36:43,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5470 [2020-07-21 19:36:43,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:36:43,285 INFO L422 BasicCegarLoop]: trace histogram [809, 809, 608, 404, 404, 404, 404, 404, 404, 404, 204, 201, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:36:43,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:43,498 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:36:43,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:36:43,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1327533009, now seen corresponding path program 11 times [2020-07-21 19:36:43,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:36:43,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499472266] [2020-07-21 19:36:43,502 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:45,748 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:36:45,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:36:45,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 12155 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:36:45,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:36:55,899 INFO L134 CoverageAnalysis]: Checked inductivity of 1817496 backedges. 5499 proven. 47934 refuted. 0 times theorem prover too weak. 1764063 trivial. 0 not checked. [2020-07-21 19:36:55,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:24,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:24,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:35,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:41,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:41,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:45,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:45,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:46,174 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:37:48,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:48,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:50,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:50,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:02,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1817496 backedges. 5499 proven. 48121 refuted. 0 times theorem prover too weak. 1763876 trivial. 0 not checked. [2020-07-21 19:38:02,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499472266] [2020-07-21 19:38:02,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:02,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:38:02,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356792692] [2020-07-21 19:38:02,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:38:02,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:02,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:38:02,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:38:02,582 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 19:38:04,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:04,211 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 19:38:04,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:38:04,213 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5469 [2020-07-21 19:38:04,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:04,224 INFO L225 Difference]: With dead ends: 137 [2020-07-21 19:38:04,224 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 19:38:04,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10949 GetRequests, 10886 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:38:04,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 19:38:04,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 19:38:04,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:38:04,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:38:04,258 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5469 [2020-07-21 19:38:04,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:04,262 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:38:04,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:38:04,262 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:38:05,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-21 19:38:05,524 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:05,528 INFO L422 BasicCegarLoop]: trace histogram [1943, 1943, 972, 971, 971, 971, 971, 971, 971, 971, 971, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:05,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:05,729 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:05,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:05,733 INFO L82 PathProgramCache]: Analyzing trace with hash 2123078736, now seen corresponding path program 12 times [2020-07-21 19:38:05,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:05,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216062234] [2020-07-21 19:38:05,734 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:10,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:10,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:10,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 28190 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 19:38:10,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:39:05,419 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119225 refuted. 0 times theorem prover too weak. 9768123 trivial. 0 not checked. [2020-07-21 19:39:05,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:39:16,286 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:39:16,388 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:39:16,500 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:39:16,609 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:39:21,505 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:39:21,614 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:39:21,739 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:39:21,871 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:39:21,999 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 19:39:22,106 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 19:40:14,307 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:40:14,418 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:40:14,526 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 19:40:14,628 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 19:40:15,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:03,331 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:41:07,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:07,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:11,089 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:41:33,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:33,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:42,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:51,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:54,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:57,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:58,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:58,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:58,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:59,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:59,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:59,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:55,812 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119435 refuted. 0 times theorem prover too weak. 9767913 trivial. 0 not checked. [2020-07-21 19:42:55,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216062234] [2020-07-21 19:42:55,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:42:55,815 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 19:42:55,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848781730] [2020-07-21 19:42:55,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 19:42:55,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:42:55,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 19:42:55,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 19:42:55,820 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 19:42:57,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:42:57,619 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 19:42:57,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 19:42:57,623 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12636 [2020-07-21 19:42:57,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:42:57,635 INFO L225 Difference]: With dead ends: 142 [2020-07-21 19:42:57,635 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 19:42:57,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25285 GetRequests, 25217 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 19:42:57,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 19:42:57,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 19:42:57,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 19:42:57,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 19:42:57,672 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12636 [2020-07-21 19:42:57,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:42:57,680 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 19:42:57,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 19:42:57,680 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 19:42:58,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14221 [2020-07-21 19:42:58,954 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:42:58,959 INFO L422 BasicCegarLoop]: trace histogram [2087, 2087, 1691, 1043, 1043, 1043, 1043, 1043, 1043, 1043, 648, 396, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:42:59,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:42:59,160 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:42:59,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:42:59,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1396100340, now seen corresponding path program 12 times [2020-07-21 19:42:59,165 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:42:59,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119812044] [2020-07-21 19:42:59,166 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:04,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:04,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:04,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 31574 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 19:43:04,893 INFO L286 TraceCheckSpWp]: Computing forward predicates...