/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:51:20,987 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:51:20,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:51:21,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 17:51:21,033 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:51:21,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:51:21,038 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:51:21,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:51:21,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:51:21,042 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:51:21,043 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:51:21,045 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:51:21,046 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:51:21,047 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:51:21,048 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:51:21,049 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:51:21,051 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:51:21,058 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:51:21,059 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:51:21,060 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:51:21,061 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 [2020-07-20 17:51:21,075 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:51:21,075 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:51:21,077 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:51:21,077 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:51:21,077 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:51:21,077 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:51:21,077 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:51:21,078 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:51:21,078 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:51:21,078 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:51:21,078 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:51:21,078 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:51:21,079 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:51:21,079 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:51:21,079 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:51:21,079 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:51:21,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:51:21,080 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:51:21,080 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:51:21,080 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:51:21,080 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:51:21,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:51:21,081 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:51:21,081 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:51:21,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:51:21,081 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:51:21,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:21,082 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:51:21,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:51:21,082 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES 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 -> 4 [2020-07-20 17:51:21,355 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:51:21,375 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:51:21,379 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:51:21,380 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:51:21,380 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:51:21,381 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 17:51:21,443 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0940cfc6/9ad2b8d77d2149b09f78e388a5b55279/FLAGffe31f651 [2020-07-20 17:51:21,875 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:51:21,875 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/MADWiFi-encode_ie_ok.i [2020-07-20 17:51:21,885 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0940cfc6/9ad2b8d77d2149b09f78e388a5b55279/FLAGffe31f651 [2020-07-20 17:51:22,251 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b0940cfc6/9ad2b8d77d2149b09f78e388a5b55279 [2020-07-20 17:51:22,260 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:51:22,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:51:22,264 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:51:22,264 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:51:22,271 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:51:22,272 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,275 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4af85b26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22, skipping insertion in model container [2020-07-20 17:51:22,275 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,283 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:51:22,302 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:51:22,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:51:22,489 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:51:22,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:51:22,523 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:51:22,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22 WrapperNode [2020-07-20 17:51:22,524 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:51:22,525 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:51:22,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:51:22,525 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:51:22,534 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,540 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,544 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,636 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,640 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (1/1) ... [2020-07-20 17:51:22,642 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:51:22,644 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:51:22,645 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:51:22,645 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:51:22,646 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (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 [2020-07-20 17:51:22,714 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:51:22,714 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:51:22,714 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:51:22,715 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:51:22,715 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:51:22,715 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:51:22,716 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:51:22,717 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:51:22,717 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:51:22,717 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:51:22,718 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:51:22,718 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:51:22,718 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:51:22,959 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:51:22,960 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:51:22,964 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:51:22 BoogieIcfgContainer [2020-07-20 17:51:22,965 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:51:22,966 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:51:22,966 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:51:22,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:51:22,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:51:22" (1/3) ... [2020-07-20 17:51:22,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@204ceb06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:51:22, skipping insertion in model container [2020-07-20 17:51:22,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:51:22" (2/3) ... [2020-07-20 17:51:22,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@204ceb06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:51:22, skipping insertion in model container [2020-07-20 17:51:22,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:51:22" (3/3) ... [2020-07-20 17:51:22,974 INFO L109 eAbstractionObserver]: Analyzing ICFG MADWiFi-encode_ie_ok.i [2020-07-20 17:51:22,984 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:51:22,992 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:51:23,012 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:51:23,040 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:51:23,040 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:51:23,040 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:51:23,041 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:51:23,042 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:51:23,042 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:51:23,042 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:51:23,043 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:51:23,068 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 17:51:23,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:51:23,082 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:23,083 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:23,084 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:23,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:23,097 INFO L82 PathProgramCache]: Analyzing trace with hash 921445730, now seen corresponding path program 1 times [2020-07-20 17:51:23,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:23,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1591917528] [2020-07-20 17:51:23,114 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:23,243 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:23,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:23,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 17:51:23,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:23,314 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:23,347 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:51:23,348 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:51:23,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1591917528] [2020-07-20 17:51:23,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:51:23,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:51:23,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470882982] [2020-07-20 17:51:23,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:51:23,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:23,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:51:23,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:51:23,373 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 6 states. [2020-07-20 17:51:23,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:23,507 INFO L93 Difference]: Finished difference Result 51 states and 67 transitions. [2020-07-20 17:51:23,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:51:23,509 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-07-20 17:51:23,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:23,519 INFO L225 Difference]: With dead ends: 51 [2020-07-20 17:51:23,519 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 17:51:23,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:51:23,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 17:51:23,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 17:51:23,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 17:51:23,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-20 17:51:23,570 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 18 [2020-07-20 17:51:23,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:23,571 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-20 17:51:23,571 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:51:23,571 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-20 17:51:23,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:51:23,573 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:23,573 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:23,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:23,789 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:23,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:23,790 INFO L82 PathProgramCache]: Analyzing trace with hash 487181509, now seen corresponding path program 1 times [2020-07-20 17:51:23,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:23,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835018207] [2020-07-20 17:51:23,792 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:23,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:23,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:23,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:51:23,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:23,873 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:23,897 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:51:23,897 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:51:23,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835018207] [2020-07-20 17:51:23,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:51:23,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:51:23,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024512610] [2020-07-20 17:51:23,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:51:23,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:23,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:51:23,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:51:23,902 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 6 states. [2020-07-20 17:51:23,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:24,000 INFO L93 Difference]: Finished difference Result 38 states and 39 transitions. [2020-07-20 17:51:24,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:51:24,000 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2020-07-20 17:51:24,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:24,003 INFO L225 Difference]: With dead ends: 38 [2020-07-20 17:51:24,003 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 17:51:24,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:51:24,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 17:51:24,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-20 17:51:24,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 17:51:24,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-20 17:51:24,018 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 23 [2020-07-20 17:51:24,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:24,019 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-20 17:51:24,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:51:24,019 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-20 17:51:24,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 17:51:24,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:24,022 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:24,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:24,237 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:24,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:24,238 INFO L82 PathProgramCache]: Analyzing trace with hash 258938125, now seen corresponding path program 1 times [2020-07-20 17:51:24,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:24,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947866581] [2020-07-20 17:51:24,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:24,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:24,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:24,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:51:24,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:24,371 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:24,419 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 17:51:24,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:24,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:24,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947866581] [2020-07-20 17:51:24,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:24,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-20 17:51:24,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472921124] [2020-07-20 17:51:24,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:51:24,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:24,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:51:24,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:51:24,593 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 9 states. [2020-07-20 17:51:24,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:24,747 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2020-07-20 17:51:24,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 17:51:24,748 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-07-20 17:51:24,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:24,749 INFO L225 Difference]: With dead ends: 47 [2020-07-20 17:51:24,750 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 17:51:24,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:51:24,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 17:51:24,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-07-20 17:51:24,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 17:51:24,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-07-20 17:51:24,774 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 36 [2020-07-20 17:51:24,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:24,774 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-07-20 17:51:24,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:51:24,774 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-07-20 17:51:24,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 17:51:24,776 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:24,776 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:24,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:24,985 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:24,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:24,986 INFO L82 PathProgramCache]: Analyzing trace with hash -801144379, now seen corresponding path program 2 times [2020-07-20 17:51:24,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:24,987 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952153123] [2020-07-20 17:51:24,988 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:25,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:25,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:25,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:51:25,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:25,141 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:25,176 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 10 proven. 11 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 17:51:25,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:25,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:25,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952153123] [2020-07-20 17:51:25,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:25,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-20 17:51:25,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023214668] [2020-07-20 17:51:25,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 17:51:25,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:25,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 17:51:25,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2020-07-20 17:51:25,290 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2020-07-20 17:51:25,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:25,516 INFO L93 Difference]: Finished difference Result 56 states and 59 transitions. [2020-07-20 17:51:25,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 17:51:25,517 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-07-20 17:51:25,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:25,519 INFO L225 Difference]: With dead ends: 56 [2020-07-20 17:51:25,519 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 17:51:25,520 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2020-07-20 17:51:25,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 17:51:25,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-20 17:51:25,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 17:51:25,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-07-20 17:51:25,531 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 49 [2020-07-20 17:51:25,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:25,532 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-07-20 17:51:25,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 17:51:25,533 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-07-20 17:51:25,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 17:51:25,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:25,535 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:25,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:25,750 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:25,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:25,751 INFO L82 PathProgramCache]: Analyzing trace with hash -907575283, now seen corresponding path program 3 times [2020-07-20 17:51:25,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:25,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890284320] [2020-07-20 17:51:25,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:25,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:25,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:25,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:51:25,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:25,961 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:26,005 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 14 proven. 24 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-20 17:51:26,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:26,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:26,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890284320] [2020-07-20 17:51:26,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:26,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 17:51:26,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751485175] [2020-07-20 17:51:26,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 17:51:26,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:26,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 17:51:26,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:51:26,133 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 13 states. [2020-07-20 17:51:26,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:26,429 INFO L93 Difference]: Finished difference Result 65 states and 69 transitions. [2020-07-20 17:51:26,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:51:26,430 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 62 [2020-07-20 17:51:26,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:26,432 INFO L225 Difference]: With dead ends: 65 [2020-07-20 17:51:26,432 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 17:51:26,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 57 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:51:26,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 17:51:26,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2020-07-20 17:51:26,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 17:51:26,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-07-20 17:51:26,444 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 62 [2020-07-20 17:51:26,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:26,446 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-07-20 17:51:26,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 17:51:26,446 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-07-20 17:51:26,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-20 17:51:26,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:26,448 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 5, 5, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:26,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:26,663 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:26,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:26,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1945307451, now seen corresponding path program 4 times [2020-07-20 17:51:26,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:26,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273437085] [2020-07-20 17:51:26,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:26,716 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:26,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:26,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:51:26,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:26,884 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:26,932 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 18 proven. 42 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-20 17:51:26,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:26,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:27,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273437085] [2020-07-20 17:51:27,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:27,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 17:51:27,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536276029] [2020-07-20 17:51:27,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:51:27,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:27,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:51:27,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:51:27,073 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand 15 states. [2020-07-20 17:51:27,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:27,460 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-07-20 17:51:27,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 17:51:27,461 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 75 [2020-07-20 17:51:27,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:27,463 INFO L225 Difference]: With dead ends: 74 [2020-07-20 17:51:27,463 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 17:51:27,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=121, Invalid=479, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:51:27,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 17:51:27,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-07-20 17:51:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 17:51:27,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 76 transitions. [2020-07-20 17:51:27,475 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 76 transitions. Word has length 75 [2020-07-20 17:51:27,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:27,476 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 76 transitions. [2020-07-20 17:51:27,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:51:27,476 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 76 transitions. [2020-07-20 17:51:27,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-07-20 17:51:27,478 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:27,478 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 6, 6, 6, 6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:27,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:27,680 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:27,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:27,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1067439347, now seen corresponding path program 5 times [2020-07-20 17:51:27,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:27,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371790478] [2020-07-20 17:51:27,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:27,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:27,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:27,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:51:27,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:27,926 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:27,979 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 22 proven. 65 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-20 17:51:27,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:28,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:28,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371790478] [2020-07-20 17:51:28,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:28,141 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-20 17:51:28,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287793363] [2020-07-20 17:51:28,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 17:51:28,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:28,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 17:51:28,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-07-20 17:51:28,143 INFO L87 Difference]: Start difference. First operand 71 states and 76 transitions. Second operand 17 states. [2020-07-20 17:51:28,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:28,619 INFO L93 Difference]: Finished difference Result 83 states and 89 transitions. [2020-07-20 17:51:28,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 17:51:28,620 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 88 [2020-07-20 17:51:28,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:28,621 INFO L225 Difference]: With dead ends: 83 [2020-07-20 17:51:28,621 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 17:51:28,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=140, Invalid=616, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:51:28,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 17:51:28,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2020-07-20 17:51:28,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 17:51:28,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-20 17:51:28,637 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 88 [2020-07-20 17:51:28,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:28,637 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-20 17:51:28,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 17:51:28,638 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-20 17:51:28,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2020-07-20 17:51:28,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:28,640 INFO L422 BasicCegarLoop]: trace histogram [14, 13, 13, 7, 7, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:28,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:28,854 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:28,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:28,854 INFO L82 PathProgramCache]: Analyzing trace with hash -29217851, now seen corresponding path program 6 times [2020-07-20 17:51:28,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:28,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5565753] [2020-07-20 17:51:28,856 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:28,902 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:28,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:28,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:51:28,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:29,117 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:29,171 INFO L134 CoverageAnalysis]: Checked inductivity of 431 backedges. 26 proven. 93 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-20 17:51:29,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:29,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:29,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5565753] [2020-07-20 17:51:29,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:29,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-20 17:51:29,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413890239] [2020-07-20 17:51:29,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 17:51:29,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:29,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 17:51:29,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:51:29,337 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 19 states. [2020-07-20 17:51:29,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:29,869 INFO L93 Difference]: Finished difference Result 92 states and 99 transitions. [2020-07-20 17:51:29,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 17:51:29,870 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 101 [2020-07-20 17:51:29,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:29,872 INFO L225 Difference]: With dead ends: 92 [2020-07-20 17:51:29,872 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 17:51:29,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2020-07-20 17:51:29,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 17:51:29,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-07-20 17:51:29,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 17:51:29,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 96 transitions. [2020-07-20 17:51:29,885 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 96 transitions. Word has length 101 [2020-07-20 17:51:29,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:29,886 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 96 transitions. [2020-07-20 17:51:29,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 17:51:29,886 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 96 transitions. [2020-07-20 17:51:29,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-07-20 17:51:29,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:29,888 INFO L422 BasicCegarLoop]: trace histogram [16, 15, 15, 8, 8, 8, 8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:30,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:30,102 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:30,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:30,103 INFO L82 PathProgramCache]: Analyzing trace with hash 923342349, now seen corresponding path program 7 times [2020-07-20 17:51:30,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:30,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049957497] [2020-07-20 17:51:30,103 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:30,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:30,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:30,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:51:30,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:30,408 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:30,477 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 30 proven. 126 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-20 17:51:30,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:30,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:30,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049957497] [2020-07-20 17:51:30,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:30,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-20 17:51:30,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238283130] [2020-07-20 17:51:30,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 17:51:30,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:30,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 17:51:30,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:51:30,649 INFO L87 Difference]: Start difference. First operand 89 states and 96 transitions. Second operand 21 states. [2020-07-20 17:51:31,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:31,324 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2020-07-20 17:51:31,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-20 17:51:31,325 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 114 [2020-07-20 17:51:31,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:31,327 INFO L225 Difference]: With dead ends: 101 [2020-07-20 17:51:31,327 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 17:51:31,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 101 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 17:51:31,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 17:51:31,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2020-07-20 17:51:31,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 17:51:31,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2020-07-20 17:51:31,340 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 114 [2020-07-20 17:51:31,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:31,341 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2020-07-20 17:51:31,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 17:51:31,341 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2020-07-20 17:51:31,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-20 17:51:31,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:31,343 INFO L422 BasicCegarLoop]: trace histogram [18, 17, 17, 9, 9, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:31,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:31,558 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:31,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:31,559 INFO L82 PathProgramCache]: Analyzing trace with hash 816783557, now seen corresponding path program 8 times [2020-07-20 17:51:31,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:31,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424604871] [2020-07-20 17:51:31,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:31,619 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:31,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:31,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 17:51:31,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:31,936 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:32,003 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 34 proven. 164 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-20 17:51:32,003 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:32,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:32,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424604871] [2020-07-20 17:51:32,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:32,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-07-20 17:51:32,180 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895741639] [2020-07-20 17:51:32,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 17:51:32,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:32,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 17:51:32,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=546, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:51:32,182 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand 23 states. [2020-07-20 17:51:32,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:32,949 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2020-07-20 17:51:32,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 17:51:32,949 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 127 [2020-07-20 17:51:32,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:32,951 INFO L225 Difference]: With dead ends: 110 [2020-07-20 17:51:32,951 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 17:51:32,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 17:51:32,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 17:51:32,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-07-20 17:51:32,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 17:51:32,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 116 transitions. [2020-07-20 17:51:32,980 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 116 transitions. Word has length 127 [2020-07-20 17:51:32,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:32,981 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 116 transitions. [2020-07-20 17:51:32,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 17:51:32,982 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 116 transitions. [2020-07-20 17:51:32,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2020-07-20 17:51:32,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:32,984 INFO L422 BasicCegarLoop]: trace histogram [20, 19, 19, 10, 10, 10, 10, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:33,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:33,198 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:33,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:33,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1777188595, now seen corresponding path program 9 times [2020-07-20 17:51:33,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:33,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776999585] [2020-07-20 17:51:33,200 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:33,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:33,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:33,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:51:33,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:33,568 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:33,635 INFO L134 CoverageAnalysis]: Checked inductivity of 929 backedges. 38 proven. 207 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-20 17:51:33,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:33,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:33,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776999585] [2020-07-20 17:51:33,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:33,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-07-20 17:51:33,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312170589] [2020-07-20 17:51:33,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:51:33,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:33,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:51:33,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:51:33,825 INFO L87 Difference]: Start difference. First operand 107 states and 116 transitions. Second operand 25 states. [2020-07-20 17:51:34,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:34,709 INFO L93 Difference]: Finished difference Result 119 states and 129 transitions. [2020-07-20 17:51:34,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 17:51:34,710 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 140 [2020-07-20 17:51:34,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:34,713 INFO L225 Difference]: With dead ends: 119 [2020-07-20 17:51:34,713 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 17:51:34,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=216, Invalid=1344, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:51:34,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 17:51:34,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 116. [2020-07-20 17:51:34,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 116 states. [2020-07-20 17:51:34,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 126 transitions. [2020-07-20 17:51:34,727 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 126 transitions. Word has length 140 [2020-07-20 17:51:34,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:34,727 INFO L479 AbstractCegarLoop]: Abstraction has 116 states and 126 transitions. [2020-07-20 17:51:34,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:51:34,727 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 126 transitions. [2020-07-20 17:51:34,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2020-07-20 17:51:34,730 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:34,730 INFO L422 BasicCegarLoop]: trace histogram [22, 21, 21, 11, 11, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:34,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:34,945 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:34,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:34,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1994140219, now seen corresponding path program 10 times [2020-07-20 17:51:34,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:34,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523095457] [2020-07-20 17:51:34,947 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:35,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:35,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:35,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 17:51:35,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:35,384 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:35,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1137 backedges. 42 proven. 255 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-20 17:51:35,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:35,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:35,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523095457] [2020-07-20 17:51:35,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:35,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-07-20 17:51:35,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478949426] [2020-07-20 17:51:35,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 17:51:35,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:35,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 17:51:35,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=746, Unknown=0, NotChecked=0, Total=870 [2020-07-20 17:51:35,685 INFO L87 Difference]: Start difference. First operand 116 states and 126 transitions. Second operand 27 states. [2020-07-20 17:51:36,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:36,674 INFO L93 Difference]: Finished difference Result 128 states and 139 transitions. [2020-07-20 17:51:36,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-07-20 17:51:36,675 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 153 [2020-07-20 17:51:36,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:36,676 INFO L225 Difference]: With dead ends: 128 [2020-07-20 17:51:36,677 INFO L226 Difference]: Without dead ends: 126 [2020-07-20 17:51:36,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 134 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=235, Invalid=1571, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 17:51:36,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-20 17:51:36,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-07-20 17:51:36,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-20 17:51:36,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 136 transitions. [2020-07-20 17:51:36,691 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 136 transitions. Word has length 153 [2020-07-20 17:51:36,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:36,696 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 136 transitions. [2020-07-20 17:51:36,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 17:51:36,696 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 136 transitions. [2020-07-20 17:51:36,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2020-07-20 17:51:36,698 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:36,699 INFO L422 BasicCegarLoop]: trace histogram [24, 23, 23, 12, 12, 12, 12, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:36,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:36,913 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:36,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:36,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1772858381, now seen corresponding path program 11 times [2020-07-20 17:51:36,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:36,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839985838] [2020-07-20 17:51:36,914 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:36,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:36,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:36,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-20 17:51:36,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:37,427 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:37,511 INFO L134 CoverageAnalysis]: Checked inductivity of 1366 backedges. 46 proven. 308 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-20 17:51:37,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:37,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:37,714 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839985838] [2020-07-20 17:51:37,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:37,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-07-20 17:51:37,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412172602] [2020-07-20 17:51:37,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:51:37,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:37,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:51:37,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2020-07-20 17:51:37,716 INFO L87 Difference]: Start difference. First operand 125 states and 136 transitions. Second operand 29 states. [2020-07-20 17:51:38,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:38,820 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2020-07-20 17:51:38,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-20 17:51:38,821 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 166 [2020-07-20 17:51:38,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:38,823 INFO L225 Difference]: With dead ends: 137 [2020-07-20 17:51:38,823 INFO L226 Difference]: Without dead ends: 135 [2020-07-20 17:51:38,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 631 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:51:38,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-20 17:51:38,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2020-07-20 17:51:38,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-07-20 17:51:38,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 146 transitions. [2020-07-20 17:51:38,836 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 146 transitions. Word has length 166 [2020-07-20 17:51:38,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:38,837 INFO L479 AbstractCegarLoop]: Abstraction has 134 states and 146 transitions. [2020-07-20 17:51:38,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:51:38,837 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 146 transitions. [2020-07-20 17:51:38,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2020-07-20 17:51:38,839 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:38,840 INFO L422 BasicCegarLoop]: trace histogram [26, 25, 25, 13, 13, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:39,052 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:39,053 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:39,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:39,054 INFO L82 PathProgramCache]: Analyzing trace with hash -915387707, now seen corresponding path program 12 times [2020-07-20 17:51:39,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:39,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302704290] [2020-07-20 17:51:39,055 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:39,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:39,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:39,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-20 17:51:39,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:39,584 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:39,687 INFO L134 CoverageAnalysis]: Checked inductivity of 1616 backedges. 50 proven. 366 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-20 17:51:39,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:39,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:39,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302704290] [2020-07-20 17:51:39,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:39,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-07-20 17:51:39,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272803037] [2020-07-20 17:51:39,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 17:51:39,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:39,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 17:51:39,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=978, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 17:51:39,929 INFO L87 Difference]: Start difference. First operand 134 states and 146 transitions. Second operand 31 states. [2020-07-20 17:51:41,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:41,226 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2020-07-20 17:51:41,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-20 17:51:41,227 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 179 [2020-07-20 17:51:41,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:41,229 INFO L225 Difference]: With dead ends: 146 [2020-07-20 17:51:41,229 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 17:51:41,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 156 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=273, Invalid=2079, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 17:51:41,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 17:51:41,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2020-07-20 17:51:41,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2020-07-20 17:51:41,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 156 transitions. [2020-07-20 17:51:41,241 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 156 transitions. Word has length 179 [2020-07-20 17:51:41,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:41,242 INFO L479 AbstractCegarLoop]: Abstraction has 143 states and 156 transitions. [2020-07-20 17:51:41,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 17:51:41,242 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 156 transitions. [2020-07-20 17:51:41,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2020-07-20 17:51:41,244 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:41,244 INFO L422 BasicCegarLoop]: trace histogram [28, 27, 27, 14, 14, 14, 14, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:41,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:41,448 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:41,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:41,449 INFO L82 PathProgramCache]: Analyzing trace with hash 1644517133, now seen corresponding path program 13 times [2020-07-20 17:51:41,449 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:41,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206597846] [2020-07-20 17:51:41,450 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:41,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:41,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:41,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 17:51:41,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:42,072 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:42,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 54 proven. 429 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-20 17:51:42,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:42,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:42,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206597846] [2020-07-20 17:51:42,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:42,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-07-20 17:51:42,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681787188] [2020-07-20 17:51:42,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:51:42,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:42,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:51:42,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1106, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:51:42,435 INFO L87 Difference]: Start difference. First operand 143 states and 156 transitions. Second operand 33 states. [2020-07-20 17:51:43,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:43,923 INFO L93 Difference]: Finished difference Result 155 states and 169 transitions. [2020-07-20 17:51:43,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-20 17:51:43,923 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 192 [2020-07-20 17:51:43,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:43,926 INFO L225 Difference]: With dead ends: 155 [2020-07-20 17:51:43,926 INFO L226 Difference]: Without dead ends: 153 [2020-07-20 17:51:43,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=292, Invalid=2360, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 17:51:43,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-20 17:51:43,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 152. [2020-07-20 17:51:43,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 152 states. [2020-07-20 17:51:43,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 166 transitions. [2020-07-20 17:51:43,944 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 166 transitions. Word has length 192 [2020-07-20 17:51:43,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:43,945 INFO L479 AbstractCegarLoop]: Abstraction has 152 states and 166 transitions. [2020-07-20 17:51:43,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:51:43,945 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 166 transitions. [2020-07-20 17:51:43,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-20 17:51:43,947 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:43,947 INFO L422 BasicCegarLoop]: trace histogram [30, 29, 29, 15, 15, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:44,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:44,163 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:44,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:44,163 INFO L82 PathProgramCache]: Analyzing trace with hash 258244549, now seen corresponding path program 14 times [2020-07-20 17:51:44,163 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:44,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [110773648] [2020-07-20 17:51:44,164 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:44,235 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:44,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:44,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 17:51:44,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:44,861 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:45,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2179 backedges. 58 proven. 497 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-20 17:51:45,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:45,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:45,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [110773648] [2020-07-20 17:51:45,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:45,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-07-20 17:51:45,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893420863] [2020-07-20 17:51:45,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 17:51:45,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:45,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 17:51:45,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1242, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:51:45,251 INFO L87 Difference]: Start difference. First operand 152 states and 166 transitions. Second operand 35 states. [2020-07-20 17:51:46,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:46,962 INFO L93 Difference]: Finished difference Result 164 states and 179 transitions. [2020-07-20 17:51:46,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 17:51:46,963 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 205 [2020-07-20 17:51:46,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:46,965 INFO L225 Difference]: With dead ends: 164 [2020-07-20 17:51:46,965 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 17:51:46,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 178 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=311, Invalid=2659, Unknown=0, NotChecked=0, Total=2970 [2020-07-20 17:51:46,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 17:51:46,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2020-07-20 17:51:46,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-20 17:51:46,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 176 transitions. [2020-07-20 17:51:46,987 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 176 transitions. Word has length 205 [2020-07-20 17:51:46,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:46,988 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 176 transitions. [2020-07-20 17:51:46,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 17:51:46,989 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 176 transitions. [2020-07-20 17:51:46,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-20 17:51:46,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:46,993 INFO L422 BasicCegarLoop]: trace histogram [32, 31, 31, 16, 16, 16, 16, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:47,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:47,194 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:47,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:47,195 INFO L82 PathProgramCache]: Analyzing trace with hash 1397703181, now seen corresponding path program 15 times [2020-07-20 17:51:47,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:47,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533792672] [2020-07-20 17:51:47,196 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:47,274 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:47,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:47,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-20 17:51:47,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:47,976 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:48,099 INFO L134 CoverageAnalysis]: Checked inductivity of 2492 backedges. 62 proven. 570 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-20 17:51:48,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:48,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:48,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533792672] [2020-07-20 17:51:48,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:48,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-07-20 17:51:48,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790927825] [2020-07-20 17:51:48,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 17:51:48,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:48,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 17:51:48,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1386, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:51:48,362 INFO L87 Difference]: Start difference. First operand 161 states and 176 transitions. Second operand 37 states. [2020-07-20 17:51:50,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:50,261 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2020-07-20 17:51:50,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-20 17:51:50,262 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 218 [2020-07-20 17:51:50,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:50,264 INFO L225 Difference]: With dead ends: 173 [2020-07-20 17:51:50,264 INFO L226 Difference]: Without dead ends: 171 [2020-07-20 17:51:50,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 189 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1069 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=330, Invalid=2976, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 17:51:50,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-07-20 17:51:50,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2020-07-20 17:51:50,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 17:51:50,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 186 transitions. [2020-07-20 17:51:50,279 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 186 transitions. Word has length 218 [2020-07-20 17:51:50,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:50,280 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 186 transitions. [2020-07-20 17:51:50,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 17:51:50,280 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 186 transitions. [2020-07-20 17:51:50,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2020-07-20 17:51:50,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:50,282 INFO L422 BasicCegarLoop]: trace histogram [34, 33, 33, 17, 17, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:50,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:50,496 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:50,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:50,497 INFO L82 PathProgramCache]: Analyzing trace with hash -724536123, now seen corresponding path program 16 times [2020-07-20 17:51:50,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:50,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433248009] [2020-07-20 17:51:50,498 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:50,571 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:50,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:50,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 41 conjunts are in the unsatisfiable core [2020-07-20 17:51:50,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:51,354 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:51,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2826 backedges. 66 proven. 648 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-20 17:51:51,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:51,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:51,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [433248009] [2020-07-20 17:51:51,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:51,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-07-20 17:51:51,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157146994] [2020-07-20 17:51:51,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 17:51:51,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:51,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 17:51:51,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1538, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 17:51:51,802 INFO L87 Difference]: Start difference. First operand 170 states and 186 transitions. Second operand 39 states. [2020-07-20 17:51:53,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:53,976 INFO L93 Difference]: Finished difference Result 182 states and 199 transitions. [2020-07-20 17:51:53,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 17:51:53,976 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 231 [2020-07-20 17:51:53,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:53,978 INFO L225 Difference]: With dead ends: 182 [2020-07-20 17:51:53,978 INFO L226 Difference]: Without dead ends: 180 [2020-07-20 17:51:53,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 200 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=349, Invalid=3311, Unknown=0, NotChecked=0, Total=3660 [2020-07-20 17:51:53,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2020-07-20 17:51:53,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2020-07-20 17:51:53,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-20 17:51:53,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 196 transitions. [2020-07-20 17:51:53,994 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 196 transitions. Word has length 231 [2020-07-20 17:51:53,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:53,995 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 196 transitions. [2020-07-20 17:51:53,995 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 17:51:53,995 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 196 transitions. [2020-07-20 17:51:53,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 245 [2020-07-20 17:51:53,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:53,997 INFO L422 BasicCegarLoop]: trace histogram [36, 35, 35, 18, 18, 18, 18, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:54,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:54,203 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:54,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:54,204 INFO L82 PathProgramCache]: Analyzing trace with hash 901344525, now seen corresponding path program 17 times [2020-07-20 17:51:54,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:54,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375501982] [2020-07-20 17:51:54,205 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:54,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:54,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:54,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-20 17:51:54,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:55,137 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:55,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3181 backedges. 70 proven. 731 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-20 17:51:55,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:55,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:55,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375501982] [2020-07-20 17:51:55,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:55,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-07-20 17:51:55,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771888716] [2020-07-20 17:51:55,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-20 17:51:55,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:55,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-20 17:51:55,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1698, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:51:55,569 INFO L87 Difference]: Start difference. First operand 179 states and 196 transitions. Second operand 41 states. [2020-07-20 17:51:57,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:51:57,892 INFO L93 Difference]: Finished difference Result 191 states and 209 transitions. [2020-07-20 17:51:57,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-20 17:51:57,897 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 244 [2020-07-20 17:51:57,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:51:57,899 INFO L225 Difference]: With dead ends: 191 [2020-07-20 17:51:57,899 INFO L226 Difference]: Without dead ends: 189 [2020-07-20 17:51:57,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 211 SyntacticMatches, 3 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=368, Invalid=3664, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 17:51:57,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-07-20 17:51:57,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 188. [2020-07-20 17:51:57,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-20 17:51:57,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 206 transitions. [2020-07-20 17:51:57,914 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 206 transitions. Word has length 244 [2020-07-20 17:51:57,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:51:57,915 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 206 transitions. [2020-07-20 17:51:57,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-20 17:51:57,915 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 206 transitions. [2020-07-20 17:51:57,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2020-07-20 17:51:57,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:51:57,917 INFO L422 BasicCegarLoop]: trace histogram [38, 37, 37, 19, 19, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:51:58,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:51:58,118 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:51:58,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:51:58,119 INFO L82 PathProgramCache]: Analyzing trace with hash -276551227, now seen corresponding path program 18 times [2020-07-20 17:51:58,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:51:58,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242957370] [2020-07-20 17:51:58,119 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:51:58,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:51:58,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:51:58,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 490 conjuncts, 45 conjunts are in the unsatisfiable core [2020-07-20 17:51:58,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:51:59,120 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:51:59,279 INFO L134 CoverageAnalysis]: Checked inductivity of 3557 backedges. 74 proven. 819 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-20 17:51:59,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:51:59,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:51:59,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242957370] [2020-07-20 17:51:59,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:51:59,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-07-20 17:51:59,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157320621] [2020-07-20 17:51:59,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 17:51:59,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:51:59,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 17:51:59,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1866, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:51:59,590 INFO L87 Difference]: Start difference. First operand 188 states and 206 transitions. Second operand 43 states. [2020-07-20 17:52:01,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:01,997 INFO L93 Difference]: Finished difference Result 200 states and 219 transitions. [2020-07-20 17:52:01,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 17:52:01,998 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 257 [2020-07-20 17:52:01,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:02,000 INFO L225 Difference]: With dead ends: 200 [2020-07-20 17:52:02,000 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 17:52:02,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1471 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=387, Invalid=4035, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 17:52:02,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 17:52:02,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2020-07-20 17:52:02,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-20 17:52:02,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 216 transitions. [2020-07-20 17:52:02,016 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 216 transitions. Word has length 257 [2020-07-20 17:52:02,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:02,017 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 216 transitions. [2020-07-20 17:52:02,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 17:52:02,017 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 216 transitions. [2020-07-20 17:52:02,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2020-07-20 17:52:02,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:02,019 INFO L422 BasicCegarLoop]: trace histogram [40, 39, 39, 20, 20, 20, 20, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:02,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:02,234 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:02,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:02,235 INFO L82 PathProgramCache]: Analyzing trace with hash 628348941, now seen corresponding path program 19 times [2020-07-20 17:52:02,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:02,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499949965] [2020-07-20 17:52:02,236 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:02,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:02,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:02,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 514 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 17:52:02,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:03,324 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:03,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3954 backedges. 78 proven. 912 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-20 17:52:03,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:03,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:03,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499949965] [2020-07-20 17:52:03,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:03,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-07-20 17:52:03,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968023076] [2020-07-20 17:52:03,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-07-20 17:52:03,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:03,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-07-20 17:52:03,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=2042, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:52:03,822 INFO L87 Difference]: Start difference. First operand 197 states and 216 transitions. Second operand 45 states. [2020-07-20 17:52:06,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:06,508 INFO L93 Difference]: Finished difference Result 209 states and 229 transitions. [2020-07-20 17:52:06,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 17:52:06,509 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 270 [2020-07-20 17:52:06,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:06,512 INFO L225 Difference]: With dead ends: 209 [2020-07-20 17:52:06,512 INFO L226 Difference]: Without dead ends: 207 [2020-07-20 17:52:06,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 233 SyntacticMatches, 3 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1619 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=406, Invalid=4424, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 17:52:06,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2020-07-20 17:52:06,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2020-07-20 17:52:06,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 17:52:06,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 226 transitions. [2020-07-20 17:52:06,531 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 226 transitions. Word has length 270 [2020-07-20 17:52:06,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:06,532 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 226 transitions. [2020-07-20 17:52:06,532 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-07-20 17:52:06,532 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 226 transitions. [2020-07-20 17:52:06,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2020-07-20 17:52:06,534 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:06,535 INFO L422 BasicCegarLoop]: trace histogram [42, 41, 41, 21, 21, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:06,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:06,750 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:06,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:06,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1857052987, now seen corresponding path program 20 times [2020-07-20 17:52:06,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:06,751 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1502515840] [2020-07-20 17:52:06,751 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:06,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:06,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:06,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 538 conjuncts, 49 conjunts are in the unsatisfiable core [2020-07-20 17:52:06,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:07,994 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:08,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4372 backedges. 82 proven. 1010 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-20 17:52:08,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:08,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:08,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1502515840] [2020-07-20 17:52:08,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:08,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-07-20 17:52:08,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273380191] [2020-07-20 17:52:08,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 17:52:08,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:08,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 17:52:08,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=2226, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 17:52:08,525 INFO L87 Difference]: Start difference. First operand 206 states and 226 transitions. Second operand 47 states. [2020-07-20 17:52:11,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:11,458 INFO L93 Difference]: Finished difference Result 218 states and 239 transitions. [2020-07-20 17:52:11,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 17:52:11,461 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 283 [2020-07-20 17:52:11,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:11,464 INFO L225 Difference]: With dead ends: 218 [2020-07-20 17:52:11,464 INFO L226 Difference]: Without dead ends: 216 [2020-07-20 17:52:11,465 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 244 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1774 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=425, Invalid=4831, Unknown=0, NotChecked=0, Total=5256 [2020-07-20 17:52:11,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-20 17:52:11,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 215. [2020-07-20 17:52:11,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-20 17:52:11,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 236 transitions. [2020-07-20 17:52:11,482 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 236 transitions. Word has length 283 [2020-07-20 17:52:11,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:11,483 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 236 transitions. [2020-07-20 17:52:11,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 17:52:11,483 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 236 transitions. [2020-07-20 17:52:11,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2020-07-20 17:52:11,485 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:11,485 INFO L422 BasicCegarLoop]: trace histogram [44, 43, 43, 22, 22, 22, 22, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:11,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:11,701 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:11,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:11,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1655603981, now seen corresponding path program 21 times [2020-07-20 17:52:11,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:11,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [236060586] [2020-07-20 17:52:11,702 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:11,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:11,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:11,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 17:52:11,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:13,134 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:13,333 INFO L134 CoverageAnalysis]: Checked inductivity of 4811 backedges. 86 proven. 1113 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-20 17:52:13,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:13,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:13,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [236060586] [2020-07-20 17:52:13,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:13,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-07-20 17:52:13,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588566751] [2020-07-20 17:52:13,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-07-20 17:52:13,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:13,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-07-20 17:52:13,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=234, Invalid=2418, Unknown=0, NotChecked=0, Total=2652 [2020-07-20 17:52:13,696 INFO L87 Difference]: Start difference. First operand 215 states and 236 transitions. Second operand 49 states. [2020-07-20 17:52:16,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:16,919 INFO L93 Difference]: Finished difference Result 227 states and 249 transitions. [2020-07-20 17:52:16,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-20 17:52:16,920 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 296 [2020-07-20 17:52:16,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:16,923 INFO L225 Difference]: With dead ends: 227 [2020-07-20 17:52:16,923 INFO L226 Difference]: Without dead ends: 225 [2020-07-20 17:52:16,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 255 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1936 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=444, Invalid=5256, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 17:52:16,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-20 17:52:16,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 224. [2020-07-20 17:52:16,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 17:52:16,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 246 transitions. [2020-07-20 17:52:16,943 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 246 transitions. Word has length 296 [2020-07-20 17:52:16,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:16,944 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 246 transitions. [2020-07-20 17:52:16,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-07-20 17:52:16,944 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 246 transitions. [2020-07-20 17:52:16,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-20 17:52:16,946 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:16,947 INFO L422 BasicCegarLoop]: trace histogram [46, 45, 45, 23, 23, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:17,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:17,160 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:17,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:17,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1208144837, now seen corresponding path program 22 times [2020-07-20 17:52:17,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:17,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250107049] [2020-07-20 17:52:17,161 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:17,315 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:17,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:17,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 586 conjuncts, 53 conjunts are in the unsatisfiable core [2020-07-20 17:52:17,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:18,665 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:18,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5271 backedges. 90 proven. 1221 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-20 17:52:18,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:18,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:19,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250107049] [2020-07-20 17:52:19,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:19,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-07-20 17:52:19,269 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572719034] [2020-07-20 17:52:19,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-07-20 17:52:19,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:19,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-07-20 17:52:19,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=2618, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 17:52:19,271 INFO L87 Difference]: Start difference. First operand 224 states and 246 transitions. Second operand 51 states. [2020-07-20 17:52:22,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:22,768 INFO L93 Difference]: Finished difference Result 236 states and 259 transitions. [2020-07-20 17:52:22,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 17:52:22,769 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 309 [2020-07-20 17:52:22,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:22,770 INFO L225 Difference]: With dead ends: 236 [2020-07-20 17:52:22,770 INFO L226 Difference]: Without dead ends: 234 [2020-07-20 17:52:22,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 346 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2105 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=463, Invalid=5699, Unknown=0, NotChecked=0, Total=6162 [2020-07-20 17:52:22,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2020-07-20 17:52:22,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2020-07-20 17:52:22,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 233 states. [2020-07-20 17:52:22,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 256 transitions. [2020-07-20 17:52:22,791 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 256 transitions. Word has length 309 [2020-07-20 17:52:22,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:22,791 INFO L479 AbstractCegarLoop]: Abstraction has 233 states and 256 transitions. [2020-07-20 17:52:22,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-07-20 17:52:22,791 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 256 transitions. [2020-07-20 17:52:22,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2020-07-20 17:52:22,793 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:22,794 INFO L422 BasicCegarLoop]: trace histogram [48, 47, 47, 24, 24, 24, 24, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:23,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:23,010 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:23,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:23,011 INFO L82 PathProgramCache]: Analyzing trace with hash 1369009677, now seen corresponding path program 23 times [2020-07-20 17:52:23,011 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:23,011 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1320961904] [2020-07-20 17:52:23,012 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:23,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:23,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:23,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-20 17:52:23,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:24,556 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:24,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5752 backedges. 94 proven. 1334 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-20 17:52:24,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:24,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:25,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1320961904] [2020-07-20 17:52:25,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:25,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-07-20 17:52:25,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46961869] [2020-07-20 17:52:25,199 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 17:52:25,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:25,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 17:52:25,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=254, Invalid=2826, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 17:52:25,200 INFO L87 Difference]: Start difference. First operand 233 states and 256 transitions. Second operand 53 states. [2020-07-20 17:52:29,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:29,278 INFO L93 Difference]: Finished difference Result 245 states and 269 transitions. [2020-07-20 17:52:29,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-20 17:52:29,279 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 322 [2020-07-20 17:52:29,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:29,281 INFO L225 Difference]: With dead ends: 245 [2020-07-20 17:52:29,281 INFO L226 Difference]: Without dead ends: 243 [2020-07-20 17:52:29,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 360 GetRequests, 277 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2281 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=482, Invalid=6160, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 17:52:29,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-20 17:52:29,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 242. [2020-07-20 17:52:29,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2020-07-20 17:52:29,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 266 transitions. [2020-07-20 17:52:29,302 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 266 transitions. Word has length 322 [2020-07-20 17:52:29,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:29,302 INFO L479 AbstractCegarLoop]: Abstraction has 242 states and 266 transitions. [2020-07-20 17:52:29,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 17:52:29,303 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 266 transitions. [2020-07-20 17:52:29,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2020-07-20 17:52:29,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:29,305 INFO L422 BasicCegarLoop]: trace histogram [50, 49, 49, 25, 25, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:29,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:29,520 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:29,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:29,520 INFO L82 PathProgramCache]: Analyzing trace with hash -43136827, now seen corresponding path program 24 times [2020-07-20 17:52:29,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:29,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050108499] [2020-07-20 17:52:29,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:52:29,638 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:29,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:29,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 57 conjunts are in the unsatisfiable core [2020-07-20 17:52:29,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:31,223 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:31,489 INFO L134 CoverageAnalysis]: Checked inductivity of 6254 backedges. 98 proven. 1452 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-20 17:52:31,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:31,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:31,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050108499] [2020-07-20 17:52:31,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:31,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-07-20 17:52:31,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144846993] [2020-07-20 17:52:31,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-20 17:52:31,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:31,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-20 17:52:31,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=3042, Unknown=0, NotChecked=0, Total=3306 [2020-07-20 17:52:31,919 INFO L87 Difference]: Start difference. First operand 242 states and 266 transitions. Second operand 55 states. [2020-07-20 17:52:35,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:35,991 INFO L93 Difference]: Finished difference Result 254 states and 279 transitions. [2020-07-20 17:52:35,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2020-07-20 17:52:35,992 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 335 [2020-07-20 17:52:35,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:35,995 INFO L225 Difference]: With dead ends: 254 [2020-07-20 17:52:35,995 INFO L226 Difference]: Without dead ends: 252 [2020-07-20 17:52:35,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 288 SyntacticMatches, 3 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2464 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=501, Invalid=6639, Unknown=0, NotChecked=0, Total=7140 [2020-07-20 17:52:35,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-20 17:52:36,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 251. [2020-07-20 17:52:36,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-20 17:52:36,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 276 transitions. [2020-07-20 17:52:36,015 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 276 transitions. Word has length 335 [2020-07-20 17:52:36,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:36,016 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 276 transitions. [2020-07-20 17:52:36,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-20 17:52:36,016 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 276 transitions. [2020-07-20 17:52:36,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2020-07-20 17:52:36,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:36,019 INFO L422 BasicCegarLoop]: trace histogram [52, 51, 51, 26, 26, 26, 26, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:36,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:36,233 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:36,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:36,234 INFO L82 PathProgramCache]: Analyzing trace with hash 2053413133, now seen corresponding path program 25 times [2020-07-20 17:52:36,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:36,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582082870] [2020-07-20 17:52:36,235 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:36,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:36,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:36,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 658 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-20 17:52:36,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:38,043 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:38,307 INFO L134 CoverageAnalysis]: Checked inductivity of 6777 backedges. 102 proven. 1575 refuted. 0 times theorem prover too weak. 5100 trivial. 0 not checked. [2020-07-20 17:52:38,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:38,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:38,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582082870] [2020-07-20 17:52:38,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:38,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-07-20 17:52:38,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573917144] [2020-07-20 17:52:38,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-07-20 17:52:38,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:38,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-07-20 17:52:38,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=3266, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 17:52:38,784 INFO L87 Difference]: Start difference. First operand 251 states and 276 transitions. Second operand 57 states. [2020-07-20 17:52:43,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:43,337 INFO L93 Difference]: Finished difference Result 263 states and 289 transitions. [2020-07-20 17:52:43,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-20 17:52:43,338 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 348 [2020-07-20 17:52:43,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:43,339 INFO L225 Difference]: With dead ends: 263 [2020-07-20 17:52:43,340 INFO L226 Difference]: Without dead ends: 261 [2020-07-20 17:52:43,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 299 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2654 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=520, Invalid=7136, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 17:52:43,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2020-07-20 17:52:43,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 260. [2020-07-20 17:52:43,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2020-07-20 17:52:43,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 286 transitions. [2020-07-20 17:52:43,360 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 286 transitions. Word has length 348 [2020-07-20 17:52:43,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:43,361 INFO L479 AbstractCegarLoop]: Abstraction has 260 states and 286 transitions. [2020-07-20 17:52:43,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-07-20 17:52:43,361 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 286 transitions. [2020-07-20 17:52:43,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 362 [2020-07-20 17:52:43,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:43,364 INFO L422 BasicCegarLoop]: trace histogram [54, 53, 53, 27, 27, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:43,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:43,577 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:43,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:43,578 INFO L82 PathProgramCache]: Analyzing trace with hash -144671291, now seen corresponding path program 26 times [2020-07-20 17:52:43,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:43,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1186520339] [2020-07-20 17:52:43,578 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:43,690 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:43,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:43,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 682 conjuncts, 61 conjunts are in the unsatisfiable core [2020-07-20 17:52:43,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:45,589 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:45,876 INFO L134 CoverageAnalysis]: Checked inductivity of 7321 backedges. 106 proven. 1703 refuted. 0 times theorem prover too weak. 5512 trivial. 0 not checked. [2020-07-20 17:52:45,876 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:45,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:46,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1186520339] [2020-07-20 17:52:46,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:46,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-07-20 17:52:46,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287315453] [2020-07-20 17:52:46,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-20 17:52:46,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:46,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-20 17:52:46,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=3498, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:52:46,376 INFO L87 Difference]: Start difference. First operand 260 states and 286 transitions. Second operand 59 states. [2020-07-20 17:52:51,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:51,273 INFO L93 Difference]: Finished difference Result 272 states and 299 transitions. [2020-07-20 17:52:51,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2020-07-20 17:52:51,274 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 361 [2020-07-20 17:52:51,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:51,277 INFO L225 Difference]: With dead ends: 272 [2020-07-20 17:52:51,277 INFO L226 Difference]: Without dead ends: 270 [2020-07-20 17:52:51,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 402 GetRequests, 310 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2851 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=539, Invalid=7651, Unknown=0, NotChecked=0, Total=8190 [2020-07-20 17:52:51,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-20 17:52:51,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 269. [2020-07-20 17:52:51,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 269 states. [2020-07-20 17:52:51,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 296 transitions. [2020-07-20 17:52:51,299 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 296 transitions. Word has length 361 [2020-07-20 17:52:51,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:51,300 INFO L479 AbstractCegarLoop]: Abstraction has 269 states and 296 transitions. [2020-07-20 17:52:51,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-20 17:52:51,300 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 296 transitions. [2020-07-20 17:52:51,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2020-07-20 17:52:51,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:51,303 INFO L422 BasicCegarLoop]: trace histogram [56, 55, 55, 28, 28, 28, 28, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:52:51,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:51,517 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:52:51,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:52:51,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1992293363, now seen corresponding path program 27 times [2020-07-20 17:52:51,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:52:51,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334152458] [2020-07-20 17:52:51,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:52:51,625 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:52:51,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:52:51,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 706 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 17:52:51,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:52:53,669 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:52:53,963 INFO L134 CoverageAnalysis]: Checked inductivity of 7886 backedges. 110 proven. 1836 refuted. 0 times theorem prover too weak. 5940 trivial. 0 not checked. [2020-07-20 17:52:53,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:52:54,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:52:54,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334152458] [2020-07-20 17:52:54,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:52:54,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-07-20 17:52:54,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044637723] [2020-07-20 17:52:54,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-07-20 17:52:54,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:52:54,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-07-20 17:52:54,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2020-07-20 17:52:54,502 INFO L87 Difference]: Start difference. First operand 269 states and 296 transitions. Second operand 61 states. [2020-07-20 17:52:59,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:52:59,809 INFO L93 Difference]: Finished difference Result 281 states and 309 transitions. [2020-07-20 17:52:59,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-20 17:52:59,810 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 374 [2020-07-20 17:52:59,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:52:59,813 INFO L225 Difference]: With dead ends: 281 [2020-07-20 17:52:59,813 INFO L226 Difference]: Without dead ends: 279 [2020-07-20 17:52:59,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 416 GetRequests, 321 SyntacticMatches, 3 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3055 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=558, Invalid=8184, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 17:52:59,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2020-07-20 17:52:59,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 278. [2020-07-20 17:52:59,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2020-07-20 17:52:59,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 306 transitions. [2020-07-20 17:52:59,836 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 306 transitions. Word has length 374 [2020-07-20 17:52:59,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:52:59,837 INFO L479 AbstractCegarLoop]: Abstraction has 278 states and 306 transitions. [2020-07-20 17:52:59,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-07-20 17:52:59,837 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 306 transitions. [2020-07-20 17:52:59,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-20 17:52:59,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:52:59,840 INFO L422 BasicCegarLoop]: trace histogram [58, 57, 57, 29, 29, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:00,055 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:00,056 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:00,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:00,057 INFO L82 PathProgramCache]: Analyzing trace with hash -676662587, now seen corresponding path program 28 times [2020-07-20 17:53:00,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:00,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19176538] [2020-07-20 17:53:00,057 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:00,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:00,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:00,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 65 conjunts are in the unsatisfiable core [2020-07-20 17:53:00,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:02,616 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:02,946 INFO L134 CoverageAnalysis]: Checked inductivity of 8472 backedges. 114 proven. 1974 refuted. 0 times theorem prover too weak. 6384 trivial. 0 not checked. [2020-07-20 17:53:02,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:03,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:03,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19176538] [2020-07-20 17:53:03,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:53:03,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2020-07-20 17:53:03,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525869726] [2020-07-20 17:53:03,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 63 states [2020-07-20 17:53:03,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:03,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2020-07-20 17:53:03,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=3986, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 17:53:03,498 INFO L87 Difference]: Start difference. First operand 278 states and 306 transitions. Second operand 63 states. [2020-07-20 17:53:09,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:09,240 INFO L93 Difference]: Finished difference Result 290 states and 319 transitions. [2020-07-20 17:53:09,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 91 states. [2020-07-20 17:53:09,242 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 387 [2020-07-20 17:53:09,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:09,244 INFO L225 Difference]: With dead ends: 290 [2020-07-20 17:53:09,244 INFO L226 Difference]: Without dead ends: 288 [2020-07-20 17:53:09,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 430 GetRequests, 332 SyntacticMatches, 3 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3266 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=577, Invalid=8735, Unknown=0, NotChecked=0, Total=9312 [2020-07-20 17:53:09,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2020-07-20 17:53:09,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 287. [2020-07-20 17:53:09,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 287 states. [2020-07-20 17:53:09,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 316 transitions. [2020-07-20 17:53:09,286 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 316 transitions. Word has length 387 [2020-07-20 17:53:09,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:09,286 INFO L479 AbstractCegarLoop]: Abstraction has 287 states and 316 transitions. [2020-07-20 17:53:09,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 63 states. [2020-07-20 17:53:09,287 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 316 transitions. [2020-07-20 17:53:09,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2020-07-20 17:53:09,289 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:09,289 INFO L422 BasicCegarLoop]: trace histogram [60, 59, 59, 30, 30, 30, 30, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:09,503 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:09,504 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:09,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:09,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1314631437, now seen corresponding path program 29 times [2020-07-20 17:53:09,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:09,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475981722] [2020-07-20 17:53:09,506 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:09,624 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:09,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:09,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 754 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 17:53:09,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:12,079 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:12,429 INFO L134 CoverageAnalysis]: Checked inductivity of 9079 backedges. 118 proven. 2117 refuted. 0 times theorem prover too weak. 6844 trivial. 0 not checked. [2020-07-20 17:53:12,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:12,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:13,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475981722] [2020-07-20 17:53:13,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:53:13,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65] total 65 [2020-07-20 17:53:13,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460576731] [2020-07-20 17:53:13,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-20 17:53:13,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:13,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-20 17:53:13,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=4242, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 17:53:13,041 INFO L87 Difference]: Start difference. First operand 287 states and 316 transitions. Second operand 65 states. [2020-07-20 17:53:19,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:19,597 INFO L93 Difference]: Finished difference Result 299 states and 329 transitions. [2020-07-20 17:53:19,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 17:53:19,598 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 400 [2020-07-20 17:53:19,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:19,601 INFO L225 Difference]: With dead ends: 299 [2020-07-20 17:53:19,601 INFO L226 Difference]: Without dead ends: 297 [2020-07-20 17:53:19,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 343 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3484 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=596, Invalid=9304, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 17:53:19,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-20 17:53:19,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 296. [2020-07-20 17:53:19,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 296 states. [2020-07-20 17:53:19,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 296 states to 296 states and 326 transitions. [2020-07-20 17:53:19,625 INFO L78 Accepts]: Start accepts. Automaton has 296 states and 326 transitions. Word has length 400 [2020-07-20 17:53:19,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:19,626 INFO L479 AbstractCegarLoop]: Abstraction has 296 states and 326 transitions. [2020-07-20 17:53:19,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-20 17:53:19,626 INFO L276 IsEmpty]: Start isEmpty. Operand 296 states and 326 transitions. [2020-07-20 17:53:19,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2020-07-20 17:53:19,629 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:19,629 INFO L422 BasicCegarLoop]: trace histogram [62, 61, 61, 31, 31, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:19,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:19,843 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:19,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:19,844 INFO L82 PathProgramCache]: Analyzing trace with hash -1675810875, now seen corresponding path program 30 times [2020-07-20 17:53:19,844 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:19,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1219852187] [2020-07-20 17:53:19,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:19,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:19,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:19,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 778 conjuncts, 69 conjunts are in the unsatisfiable core [2020-07-20 17:53:19,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:22,653 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:23,024 INFO L134 CoverageAnalysis]: Checked inductivity of 9707 backedges. 122 proven. 2265 refuted. 0 times theorem prover too weak. 7320 trivial. 0 not checked. [2020-07-20 17:53:23,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:23,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:23,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1219852187] [2020-07-20 17:53:23,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:53:23,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67] total 67 [2020-07-20 17:53:23,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601929148] [2020-07-20 17:53:23,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2020-07-20 17:53:23,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:23,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2020-07-20 17:53:23,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=4506, Unknown=0, NotChecked=0, Total=4830 [2020-07-20 17:53:23,699 INFO L87 Difference]: Start difference. First operand 296 states and 326 transitions. Second operand 67 states. [2020-07-20 17:53:31,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:31,013 INFO L93 Difference]: Finished difference Result 308 states and 339 transitions. [2020-07-20 17:53:31,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2020-07-20 17:53:31,014 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 413 [2020-07-20 17:53:31,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:31,017 INFO L225 Difference]: With dead ends: 308 [2020-07-20 17:53:31,017 INFO L226 Difference]: Without dead ends: 306 [2020-07-20 17:53:31,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 354 SyntacticMatches, 3 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3709 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=615, Invalid=9891, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 17:53:31,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2020-07-20 17:53:31,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 305. [2020-07-20 17:53:31,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 305 states. [2020-07-20 17:53:31,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 336 transitions. [2020-07-20 17:53:31,036 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 336 transitions. Word has length 413 [2020-07-20 17:53:31,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:31,036 INFO L479 AbstractCegarLoop]: Abstraction has 305 states and 336 transitions. [2020-07-20 17:53:31,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 67 states. [2020-07-20 17:53:31,037 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 336 transitions. [2020-07-20 17:53:31,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 427 [2020-07-20 17:53:31,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:31,040 INFO L422 BasicCegarLoop]: trace histogram [64, 63, 63, 32, 32, 32, 32, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:31,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:31,247 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:31,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:31,248 INFO L82 PathProgramCache]: Analyzing trace with hash -1108895219, now seen corresponding path program 31 times [2020-07-20 17:53:31,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:31,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966750019] [2020-07-20 17:53:31,248 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:31,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:31,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:31,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 802 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-20 17:53:31,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:34,341 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:34,728 INFO L134 CoverageAnalysis]: Checked inductivity of 10356 backedges. 126 proven. 2418 refuted. 0 times theorem prover too weak. 7812 trivial. 0 not checked. [2020-07-20 17:53:34,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:34,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:35,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966750019] [2020-07-20 17:53:35,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:53:35,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2020-07-20 17:53:35,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815128655] [2020-07-20 17:53:35,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2020-07-20 17:53:35,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:35,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2020-07-20 17:53:35,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=4778, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 17:53:35,403 INFO L87 Difference]: Start difference. First operand 305 states and 336 transitions. Second operand 69 states. [2020-07-20 17:53:43,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:43,341 INFO L93 Difference]: Finished difference Result 317 states and 349 transitions. [2020-07-20 17:53:43,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 17:53:43,343 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 426 [2020-07-20 17:53:43,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:43,346 INFO L225 Difference]: With dead ends: 317 [2020-07-20 17:53:43,346 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 17:53:43,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 472 GetRequests, 365 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3941 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=634, Invalid=10496, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 17:53:43,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 17:53:43,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2020-07-20 17:53:43,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2020-07-20 17:53:43,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 346 transitions. [2020-07-20 17:53:43,372 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 346 transitions. Word has length 426 [2020-07-20 17:53:43,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:43,373 INFO L479 AbstractCegarLoop]: Abstraction has 314 states and 346 transitions. [2020-07-20 17:53:43,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 69 states. [2020-07-20 17:53:43,373 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 346 transitions. [2020-07-20 17:53:43,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2020-07-20 17:53:43,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:43,376 INFO L422 BasicCegarLoop]: trace histogram [66, 65, 65, 33, 33, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:43,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:43,591 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:43,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:43,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1635312443, now seen corresponding path program 32 times [2020-07-20 17:53:43,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:43,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416414499] [2020-07-20 17:53:43,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:43,726 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:43,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:43,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 17:53:43,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:53:46,993 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:53:47,428 INFO L134 CoverageAnalysis]: Checked inductivity of 11026 backedges. 130 proven. 2576 refuted. 0 times theorem prover too weak. 8320 trivial. 0 not checked. [2020-07-20 17:53:47,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:53:47,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:53:48,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416414499] [2020-07-20 17:53:48,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:53:48,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71] total 71 [2020-07-20 17:53:48,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657817217] [2020-07-20 17:53:48,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-20 17:53:48,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:53:48,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-20 17:53:48,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=344, Invalid=5058, Unknown=0, NotChecked=0, Total=5402 [2020-07-20 17:53:48,153 INFO L87 Difference]: Start difference. First operand 314 states and 346 transitions. Second operand 71 states. [2020-07-20 17:53:56,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:53:56,710 INFO L93 Difference]: Finished difference Result 326 states and 359 transitions. [2020-07-20 17:53:56,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 17:53:56,712 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 439 [2020-07-20 17:53:56,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:53:56,715 INFO L225 Difference]: With dead ends: 326 [2020-07-20 17:53:56,715 INFO L226 Difference]: Without dead ends: 324 [2020-07-20 17:53:56,716 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 376 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4180 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=653, Invalid=11119, Unknown=0, NotChecked=0, Total=11772 [2020-07-20 17:53:56,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2020-07-20 17:53:56,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 323. [2020-07-20 17:53:56,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 323 states. [2020-07-20 17:53:56,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 356 transitions. [2020-07-20 17:53:56,749 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 356 transitions. Word has length 439 [2020-07-20 17:53:56,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:53:56,750 INFO L479 AbstractCegarLoop]: Abstraction has 323 states and 356 transitions. [2020-07-20 17:53:56,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-20 17:53:56,750 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 356 transitions. [2020-07-20 17:53:56,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-20 17:53:56,753 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:53:56,754 INFO L422 BasicCegarLoop]: trace histogram [68, 67, 67, 34, 34, 34, 34, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:53:56,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:56,968 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:53:56,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:53:56,968 INFO L82 PathProgramCache]: Analyzing trace with hash -267139827, now seen corresponding path program 33 times [2020-07-20 17:53:56,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:53:56,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [696657898] [2020-07-20 17:53:56,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:53:57,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:53:57,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:53:57,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-20 17:53:57,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:00,696 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:01,159 INFO L134 CoverageAnalysis]: Checked inductivity of 11717 backedges. 134 proven. 2739 refuted. 0 times theorem prover too weak. 8844 trivial. 0 not checked. [2020-07-20 17:54:01,159 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:01,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:01,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [696657898] [2020-07-20 17:54:01,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:54:01,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73] total 73 [2020-07-20 17:54:01,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968382193] [2020-07-20 17:54:01,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 73 states [2020-07-20 17:54:01,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:01,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2020-07-20 17:54:01,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=5346, Unknown=0, NotChecked=0, Total=5700 [2020-07-20 17:54:01,929 INFO L87 Difference]: Start difference. First operand 323 states and 356 transitions. Second operand 73 states. [2020-07-20 17:54:11,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:11,467 INFO L93 Difference]: Finished difference Result 335 states and 369 transitions. [2020-07-20 17:54:11,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 17:54:11,469 INFO L78 Accepts]: Start accepts. Automaton has 73 states. Word has length 452 [2020-07-20 17:54:11,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:11,472 INFO L225 Difference]: With dead ends: 335 [2020-07-20 17:54:11,472 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 17:54:11,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 500 GetRequests, 387 SyntacticMatches, 3 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4426 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=672, Invalid=11760, Unknown=0, NotChecked=0, Total=12432 [2020-07-20 17:54:11,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 17:54:11,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 332. [2020-07-20 17:54:11,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-20 17:54:11,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 366 transitions. [2020-07-20 17:54:11,501 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 366 transitions. Word has length 452 [2020-07-20 17:54:11,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:11,502 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 366 transitions. [2020-07-20 17:54:11,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 73 states. [2020-07-20 17:54:11,502 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 366 transitions. [2020-07-20 17:54:11,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-20 17:54:11,505 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:11,506 INFO L422 BasicCegarLoop]: trace histogram [70, 69, 69, 35, 35, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:11,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:11,718 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:11,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:11,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1799827003, now seen corresponding path program 34 times [2020-07-20 17:54:11,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:11,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [865777830] [2020-07-20 17:54:11,719 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:11,855 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:11,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:11,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 874 conjuncts, 77 conjunts are in the unsatisfiable core [2020-07-20 17:54:11,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:15,766 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:16,248 INFO L134 CoverageAnalysis]: Checked inductivity of 12429 backedges. 138 proven. 2907 refuted. 0 times theorem prover too weak. 9384 trivial. 0 not checked. [2020-07-20 17:54:16,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:16,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:17,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [865777830] [2020-07-20 17:54:17,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:54:17,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75] total 75 [2020-07-20 17:54:17,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68349489] [2020-07-20 17:54:17,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 75 states [2020-07-20 17:54:17,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:17,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2020-07-20 17:54:17,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=5642, Unknown=0, NotChecked=0, Total=6006 [2020-07-20 17:54:17,079 INFO L87 Difference]: Start difference. First operand 332 states and 366 transitions. Second operand 75 states. [2020-07-20 17:54:28,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:28,291 INFO L93 Difference]: Finished difference Result 344 states and 379 transitions. [2020-07-20 17:54:28,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2020-07-20 17:54:28,293 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 465 [2020-07-20 17:54:28,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:28,296 INFO L225 Difference]: With dead ends: 344 [2020-07-20 17:54:28,296 INFO L226 Difference]: Without dead ends: 342 [2020-07-20 17:54:28,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 398 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4679 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=691, Invalid=12419, Unknown=0, NotChecked=0, Total=13110 [2020-07-20 17:54:28,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2020-07-20 17:54:28,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 341. [2020-07-20 17:54:28,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 17:54:28,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 376 transitions. [2020-07-20 17:54:28,326 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 376 transitions. Word has length 465 [2020-07-20 17:54:28,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:28,327 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 376 transitions. [2020-07-20 17:54:28,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 75 states. [2020-07-20 17:54:28,327 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 376 transitions. [2020-07-20 17:54:28,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-20 17:54:28,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:28,331 INFO L422 BasicCegarLoop]: trace histogram [72, 71, 71, 36, 36, 36, 36, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:28,538 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:28,539 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:28,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:28,540 INFO L82 PathProgramCache]: Analyzing trace with hash 554709005, now seen corresponding path program 35 times [2020-07-20 17:54:28,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:28,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638047940] [2020-07-20 17:54:28,541 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:28,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:28,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:28,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 898 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-20 17:54:28,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:33,080 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:33,590 INFO L134 CoverageAnalysis]: Checked inductivity of 13162 backedges. 142 proven. 3080 refuted. 0 times theorem prover too weak. 9940 trivial. 0 not checked. [2020-07-20 17:54:33,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:33,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:34,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638047940] [2020-07-20 17:54:34,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:54:34,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [77] total 77 [2020-07-20 17:54:34,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068156914] [2020-07-20 17:54:34,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-20 17:54:34,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:34,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-20 17:54:34,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=5946, Unknown=0, NotChecked=0, Total=6320 [2020-07-20 17:54:34,497 INFO L87 Difference]: Start difference. First operand 341 states and 376 transitions. Second operand 77 states. [2020-07-20 17:54:47,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:47,153 INFO L93 Difference]: Finished difference Result 353 states and 389 transitions. [2020-07-20 17:54:47,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2020-07-20 17:54:47,155 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 478 [2020-07-20 17:54:47,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:47,158 INFO L225 Difference]: With dead ends: 353 [2020-07-20 17:54:47,158 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 17:54:47,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 528 GetRequests, 409 SyntacticMatches, 3 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4939 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=710, Invalid=13096, Unknown=0, NotChecked=0, Total=13806 [2020-07-20 17:54:47,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 17:54:47,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 350. [2020-07-20 17:54:47,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-20 17:54:47,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 386 transitions. [2020-07-20 17:54:47,186 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 386 transitions. Word has length 478 [2020-07-20 17:54:47,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:47,187 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 386 transitions. [2020-07-20 17:54:47,187 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-20 17:54:47,187 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 386 transitions. [2020-07-20 17:54:47,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2020-07-20 17:54:47,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:47,190 INFO L422 BasicCegarLoop]: trace histogram [74, 73, 73, 37, 37, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:47,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:47,390 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:47,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:47,391 INFO L82 PathProgramCache]: Analyzing trace with hash -1870510395, now seen corresponding path program 36 times [2020-07-20 17:54:47,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:47,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1595428447] [2020-07-20 17:54:47,392 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:47,535 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:47,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:47,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 922 conjuncts, 81 conjunts are in the unsatisfiable core [2020-07-20 17:54:47,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:52,358 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:52,913 INFO L134 CoverageAnalysis]: Checked inductivity of 13916 backedges. 146 proven. 3258 refuted. 0 times theorem prover too weak. 10512 trivial. 0 not checked. [2020-07-20 17:54:52,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:53,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:53,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1595428447] [2020-07-20 17:54:53,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:54:53,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79] total 79 [2020-07-20 17:54:53,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027043958] [2020-07-20 17:54:53,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 79 states [2020-07-20 17:54:53,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:53,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2020-07-20 17:54:53,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=6258, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 17:54:53,872 INFO L87 Difference]: Start difference. First operand 350 states and 386 transitions. Second operand 79 states. [2020-07-20 17:55:08,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:08,246 INFO L93 Difference]: Finished difference Result 362 states and 399 transitions. [2020-07-20 17:55:08,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 17:55:08,248 INFO L78 Accepts]: Start accepts. Automaton has 79 states. Word has length 491 [2020-07-20 17:55:08,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:08,251 INFO L225 Difference]: With dead ends: 362 [2020-07-20 17:55:08,251 INFO L226 Difference]: Without dead ends: 360 [2020-07-20 17:55:08,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 542 GetRequests, 420 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=729, Invalid=13791, Unknown=0, NotChecked=0, Total=14520 [2020-07-20 17:55:08,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2020-07-20 17:55:08,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 359. [2020-07-20 17:55:08,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 359 states. [2020-07-20 17:55:08,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 396 transitions. [2020-07-20 17:55:08,282 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 396 transitions. Word has length 491 [2020-07-20 17:55:08,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:08,283 INFO L479 AbstractCegarLoop]: Abstraction has 359 states and 396 transitions. [2020-07-20 17:55:08,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 79 states. [2020-07-20 17:55:08,283 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 396 transitions. [2020-07-20 17:55:08,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 505 [2020-07-20 17:55:08,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:08,287 INFO L422 BasicCegarLoop]: trace histogram [76, 75, 75, 38, 38, 38, 38, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:08,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:08,502 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:08,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:08,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1324557555, now seen corresponding path program 37 times [2020-07-20 17:55:08,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:08,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638015598] [2020-07-20 17:55:08,504 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:08,670 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:08,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:08,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 946 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-20 17:55:08,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:13,991 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:55:14,579 INFO L134 CoverageAnalysis]: Checked inductivity of 14691 backedges. 150 proven. 3441 refuted. 0 times theorem prover too weak. 11100 trivial. 0 not checked. [2020-07-20 17:55:14,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:14,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:55:15,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638015598] [2020-07-20 17:55:15,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:55:15,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [81] total 81 [2020-07-20 17:55:15,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081426401] [2020-07-20 17:55:15,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 81 states [2020-07-20 17:55:15,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:15,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2020-07-20 17:55:15,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=6578, Unknown=0, NotChecked=0, Total=6972 [2020-07-20 17:55:15,630 INFO L87 Difference]: Start difference. First operand 359 states and 396 transitions. Second operand 81 states. [2020-07-20 17:55:31,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:31,847 INFO L93 Difference]: Finished difference Result 371 states and 409 transitions. [2020-07-20 17:55:31,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2020-07-20 17:55:31,849 INFO L78 Accepts]: Start accepts. Automaton has 81 states. Word has length 504 [2020-07-20 17:55:31,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:31,852 INFO L225 Difference]: With dead ends: 371 [2020-07-20 17:55:31,852 INFO L226 Difference]: Without dead ends: 369 [2020-07-20 17:55:31,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 431 SyntacticMatches, 3 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5480 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=748, Invalid=14504, Unknown=0, NotChecked=0, Total=15252 [2020-07-20 17:55:31,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-20 17:55:31,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 368. [2020-07-20 17:55:31,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 17:55:31,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 406 transitions. [2020-07-20 17:55:31,884 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 406 transitions. Word has length 504 [2020-07-20 17:55:31,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:31,885 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 406 transitions. [2020-07-20 17:55:31,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 81 states. [2020-07-20 17:55:31,886 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 406 transitions. [2020-07-20 17:55:31,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2020-07-20 17:55:31,890 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:31,890 INFO L422 BasicCegarLoop]: trace histogram [78, 77, 77, 39, 39, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:32,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:32,106 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:32,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:32,106 INFO L82 PathProgramCache]: Analyzing trace with hash -5014587, now seen corresponding path program 38 times [2020-07-20 17:55:32,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:32,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760091668] [2020-07-20 17:55:32,107 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:32,251 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:32,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:32,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 85 conjunts are in the unsatisfiable core [2020-07-20 17:55:32,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:38,034 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:55:38,660 INFO L134 CoverageAnalysis]: Checked inductivity of 15487 backedges. 154 proven. 3629 refuted. 0 times theorem prover too weak. 11704 trivial. 0 not checked. [2020-07-20 17:55:38,660 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:38,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:55:39,786 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760091668] [2020-07-20 17:55:39,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:55:39,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83] total 83 [2020-07-20 17:55:39,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675530910] [2020-07-20 17:55:39,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-20 17:55:39,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:39,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-20 17:55:39,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=6906, Unknown=0, NotChecked=0, Total=7310 [2020-07-20 17:55:39,788 INFO L87 Difference]: Start difference. First operand 368 states and 406 transitions. Second operand 83 states. [2020-07-20 17:55:56,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:56,794 INFO L93 Difference]: Finished difference Result 380 states and 419 transitions. [2020-07-20 17:55:56,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2020-07-20 17:55:56,796 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 517 [2020-07-20 17:55:56,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:56,799 INFO L225 Difference]: With dead ends: 380 [2020-07-20 17:55:56,799 INFO L226 Difference]: Without dead ends: 378 [2020-07-20 17:55:56,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 442 SyntacticMatches, 3 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5761 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=767, Invalid=15235, Unknown=0, NotChecked=0, Total=16002 [2020-07-20 17:55:56,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2020-07-20 17:55:56,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2020-07-20 17:55:56,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 377 states. [2020-07-20 17:55:56,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 416 transitions. [2020-07-20 17:55:56,829 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 416 transitions. Word has length 517 [2020-07-20 17:55:56,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:56,830 INFO L479 AbstractCegarLoop]: Abstraction has 377 states and 416 transitions. [2020-07-20 17:55:56,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-20 17:55:56,830 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 416 transitions. [2020-07-20 17:55:56,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 531 [2020-07-20 17:55:56,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:56,834 INFO L422 BasicCegarLoop]: trace histogram [80, 79, 79, 40, 40, 40, 40, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:57,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:57,035 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:57,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:57,035 INFO L82 PathProgramCache]: Analyzing trace with hash 607766029, now seen corresponding path program 39 times [2020-07-20 17:55:57,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:57,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003864498] [2020-07-20 17:55:57,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:57,180 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:55:57,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:57,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 994 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-20 17:55:57,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:03,355 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:56:03,992 INFO L134 CoverageAnalysis]: Checked inductivity of 16304 backedges. 158 proven. 3822 refuted. 0 times theorem prover too weak. 12324 trivial. 0 not checked. [2020-07-20 17:56:03,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:04,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:05,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003864498] [2020-07-20 17:56:05,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:56:05,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [85] total 85 [2020-07-20 17:56:05,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239896274] [2020-07-20 17:56:05,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 85 states [2020-07-20 17:56:05,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:05,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2020-07-20 17:56:05,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=414, Invalid=7242, Unknown=0, NotChecked=0, Total=7656 [2020-07-20 17:56:05,242 INFO L87 Difference]: Start difference. First operand 377 states and 416 transitions. Second operand 85 states. [2020-07-20 17:56:27,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:27,054 INFO L93 Difference]: Finished difference Result 389 states and 429 transitions. [2020-07-20 17:56:27,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 17:56:27,057 INFO L78 Accepts]: Start accepts. Automaton has 85 states. Word has length 530 [2020-07-20 17:56:27,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:27,061 INFO L225 Difference]: With dead ends: 389 [2020-07-20 17:56:27,061 INFO L226 Difference]: Without dead ends: 387 [2020-07-20 17:56:27,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 584 GetRequests, 453 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6049 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=786, Invalid=15984, Unknown=0, NotChecked=0, Total=16770 [2020-07-20 17:56:27,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2020-07-20 17:56:27,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2020-07-20 17:56:27,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2020-07-20 17:56:27,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 426 transitions. [2020-07-20 17:56:27,089 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 426 transitions. Word has length 530 [2020-07-20 17:56:27,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:27,090 INFO L479 AbstractCegarLoop]: Abstraction has 386 states and 426 transitions. [2020-07-20 17:56:27,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 85 states. [2020-07-20 17:56:27,090 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 426 transitions. [2020-07-20 17:56:27,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 544 [2020-07-20 17:56:27,092 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:27,093 INFO L422 BasicCegarLoop]: trace histogram [82, 81, 81, 41, 41, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:27,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:27,294 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:27,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:27,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1407422267, now seen corresponding path program 40 times [2020-07-20 17:56:27,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:27,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987814496] [2020-07-20 17:56:27,295 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:27,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:27,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:27,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 89 conjunts are in the unsatisfiable core [2020-07-20 17:56:27,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:34,289 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:56:35,001 INFO L134 CoverageAnalysis]: Checked inductivity of 17142 backedges. 162 proven. 4020 refuted. 0 times theorem prover too weak. 12960 trivial. 0 not checked. [2020-07-20 17:56:35,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:35,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:56:36,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987814496] [2020-07-20 17:56:36,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:56:36,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87] total 87 [2020-07-20 17:56:36,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946750874] [2020-07-20 17:56:36,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 87 states [2020-07-20 17:56:36,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:36,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2020-07-20 17:56:36,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=7586, Unknown=0, NotChecked=0, Total=8010 [2020-07-20 17:56:36,285 INFO L87 Difference]: Start difference. First operand 386 states and 426 transitions. Second operand 87 states. [2020-07-20 17:56:58,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:58,464 INFO L93 Difference]: Finished difference Result 398 states and 439 transitions. [2020-07-20 17:56:58,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2020-07-20 17:56:58,467 INFO L78 Accepts]: Start accepts. Automaton has 87 states. Word has length 543 [2020-07-20 17:56:58,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:58,470 INFO L225 Difference]: With dead ends: 398 [2020-07-20 17:56:58,470 INFO L226 Difference]: Without dead ends: 396 [2020-07-20 17:56:58,482 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 598 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6344 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=805, Invalid=16751, Unknown=0, NotChecked=0, Total=17556 [2020-07-20 17:56:58,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2020-07-20 17:56:58,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 395. [2020-07-20 17:56:58,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2020-07-20 17:56:58,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 436 transitions. [2020-07-20 17:56:58,506 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 436 transitions. Word has length 543 [2020-07-20 17:56:58,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:58,507 INFO L479 AbstractCegarLoop]: Abstraction has 395 states and 436 transitions. [2020-07-20 17:56:58,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 87 states. [2020-07-20 17:56:58,507 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 436 transitions. [2020-07-20 17:56:58,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 557 [2020-07-20 17:56:58,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:58,512 INFO L422 BasicCegarLoop]: trace histogram [84, 83, 83, 42, 42, 42, 42, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:58,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:58,726 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:58,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:58,727 INFO L82 PathProgramCache]: Analyzing trace with hash 583463181, now seen corresponding path program 41 times [2020-07-20 17:56:58,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:58,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46687343] [2020-07-20 17:56:58,728 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:58,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:56:58,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:58,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-20 17:56:58,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:06,207 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:06,957 INFO L134 CoverageAnalysis]: Checked inductivity of 18001 backedges. 166 proven. 4223 refuted. 0 times theorem prover too weak. 13612 trivial. 0 not checked. [2020-07-20 17:57:06,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:07,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:08,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46687343] [2020-07-20 17:57:08,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:57:08,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89] total 89 [2020-07-20 17:57:08,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424407421] [2020-07-20 17:57:08,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-20 17:57:08,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:08,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-20 17:57:08,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=434, Invalid=7938, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 17:57:08,296 INFO L87 Difference]: Start difference. First operand 395 states and 436 transitions. Second operand 89 states. [2020-07-20 17:57:33,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:33,997 INFO L93 Difference]: Finished difference Result 407 states and 449 transitions. [2020-07-20 17:57:34,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 17:57:34,001 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 556 [2020-07-20 17:57:34,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:34,004 INFO L225 Difference]: With dead ends: 407 [2020-07-20 17:57:34,004 INFO L226 Difference]: Without dead ends: 405 [2020-07-20 17:57:34,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 612 GetRequests, 475 SyntacticMatches, 3 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6646 ImplicationChecksByTransitivity, 13.4s TimeCoverageRelationStatistics Valid=824, Invalid=17536, Unknown=0, NotChecked=0, Total=18360 [2020-07-20 17:57:34,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2020-07-20 17:57:34,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 404. [2020-07-20 17:57:34,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 404 states. [2020-07-20 17:57:34,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 446 transitions. [2020-07-20 17:57:34,035 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 446 transitions. Word has length 556 [2020-07-20 17:57:34,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:34,036 INFO L479 AbstractCegarLoop]: Abstraction has 404 states and 446 transitions. [2020-07-20 17:57:34,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-20 17:57:34,036 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 446 transitions. [2020-07-20 17:57:34,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 570 [2020-07-20 17:57:34,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:34,040 INFO L422 BasicCegarLoop]: trace histogram [86, 85, 85, 43, 43, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:34,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:34,241 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:34,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:34,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1148377659, now seen corresponding path program 42 times [2020-07-20 17:57:34,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:34,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841775038] [2020-07-20 17:57:34,243 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:34,397 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:34,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:34,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 1066 conjuncts, 93 conjunts are in the unsatisfiable core [2020-07-20 17:57:34,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:42,999 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:43,832 INFO L134 CoverageAnalysis]: Checked inductivity of 18881 backedges. 170 proven. 4431 refuted. 0 times theorem prover too weak. 14280 trivial. 0 not checked. [2020-07-20 17:57:43,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:44,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:45,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841775038] [2020-07-20 17:57:45,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:57:45,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91] total 91 [2020-07-20 17:57:45,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834280954] [2020-07-20 17:57:45,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 91 states [2020-07-20 17:57:45,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:45,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2020-07-20 17:57:45,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=444, Invalid=8298, Unknown=0, NotChecked=0, Total=8742 [2020-07-20 17:57:45,472 INFO L87 Difference]: Start difference. First operand 404 states and 446 transitions. Second operand 91 states. [2020-07-20 17:58:16,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:16,107 INFO L93 Difference]: Finished difference Result 416 states and 459 transitions. [2020-07-20 17:58:16,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2020-07-20 17:58:16,111 INFO L78 Accepts]: Start accepts. Automaton has 91 states. Word has length 569 [2020-07-20 17:58:16,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:16,114 INFO L225 Difference]: With dead ends: 416 [2020-07-20 17:58:16,115 INFO L226 Difference]: Without dead ends: 414 [2020-07-20 17:58:16,116 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 626 GetRequests, 486 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6955 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=843, Invalid=18339, Unknown=0, NotChecked=0, Total=19182 [2020-07-20 17:58:16,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2020-07-20 17:58:16,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2020-07-20 17:58:16,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-07-20 17:58:16,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 456 transitions. [2020-07-20 17:58:16,145 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 456 transitions. Word has length 569 [2020-07-20 17:58:16,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:16,145 INFO L479 AbstractCegarLoop]: Abstraction has 413 states and 456 transitions. [2020-07-20 17:58:16,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 91 states. [2020-07-20 17:58:16,145 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 456 transitions. [2020-07-20 17:58:16,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 583 [2020-07-20 17:58:16,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:16,161 INFO L422 BasicCegarLoop]: trace histogram [88, 87, 87, 44, 44, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:16,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:16,362 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:16,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:16,363 INFO L82 PathProgramCache]: Analyzing trace with hash 2028231693, now seen corresponding path program 43 times [2020-07-20 17:58:16,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:16,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1550915524] [2020-07-20 17:58:16,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:16,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:16,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:16,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 17:58:16,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:26,190 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:58:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 19782 backedges. 174 proven. 4644 refuted. 0 times theorem prover too weak. 14964 trivial. 0 not checked. [2020-07-20 17:58:27,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:27,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:28,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1550915524] [2020-07-20 17:58:28,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:58:28,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93] total 93 [2020-07-20 17:58:28,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640196333] [2020-07-20 17:58:28,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 93 states [2020-07-20 17:58:28,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:28,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2020-07-20 17:58:28,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=454, Invalid=8666, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 17:58:28,894 INFO L87 Difference]: Start difference. First operand 413 states and 456 transitions. Second operand 93 states. [2020-07-20 17:59:05,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:05,605 INFO L93 Difference]: Finished difference Result 425 states and 469 transitions. [2020-07-20 17:59:05,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2020-07-20 17:59:05,609 INFO L78 Accepts]: Start accepts. Automaton has 93 states. Word has length 582 [2020-07-20 17:59:05,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:05,612 INFO L225 Difference]: With dead ends: 425 [2020-07-20 17:59:05,612 INFO L226 Difference]: Without dead ends: 423 [2020-07-20 17:59:05,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 497 SyntacticMatches, 3 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7271 ImplicationChecksByTransitivity, 17.9s TimeCoverageRelationStatistics Valid=862, Invalid=19160, Unknown=0, NotChecked=0, Total=20022 [2020-07-20 17:59:05,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 423 states. [2020-07-20 17:59:05,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 423 to 422. [2020-07-20 17:59:05,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 422 states. [2020-07-20 17:59:05,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 466 transitions. [2020-07-20 17:59:05,666 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 466 transitions. Word has length 582 [2020-07-20 17:59:05,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:05,667 INFO L479 AbstractCegarLoop]: Abstraction has 422 states and 466 transitions. [2020-07-20 17:59:05,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 93 states. [2020-07-20 17:59:05,667 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 466 transitions. [2020-07-20 17:59:05,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 596 [2020-07-20 17:59:05,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:05,672 INFO L422 BasicCegarLoop]: trace histogram [90, 89, 89, 45, 45, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:05,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:05,884 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:05,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:05,885 INFO L82 PathProgramCache]: Analyzing trace with hash -1344955707, now seen corresponding path program 44 times [2020-07-20 17:59:05,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:05,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82866076] [2020-07-20 17:59:05,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:06,057 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:06,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:06,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 1114 conjuncts, 97 conjunts are in the unsatisfiable core [2020-07-20 17:59:06,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:17,530 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:59:18,548 INFO L134 CoverageAnalysis]: Checked inductivity of 20704 backedges. 178 proven. 4862 refuted. 0 times theorem prover too weak. 15664 trivial. 0 not checked. [2020-07-20 17:59:18,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:19,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:20,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82866076] [2020-07-20 17:59:20,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 17:59:20,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95] total 95 [2020-07-20 17:59:20,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454488724] [2020-07-20 17:59:20,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-20 17:59:20,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:20,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-20 17:59:20,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=464, Invalid=9042, Unknown=0, NotChecked=0, Total=9506 [2020-07-20 17:59:20,717 INFO L87 Difference]: Start difference. First operand 422 states and 466 transitions. Second operand 95 states. [2020-07-20 18:00:06,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:06,839 INFO L93 Difference]: Finished difference Result 434 states and 479 transitions. [2020-07-20 18:00:06,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2020-07-20 18:00:06,845 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 595 [2020-07-20 18:00:06,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:06,848 INFO L225 Difference]: With dead ends: 434 [2020-07-20 18:00:06,849 INFO L226 Difference]: Without dead ends: 432 [2020-07-20 18:00:06,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 654 GetRequests, 508 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7594 ImplicationChecksByTransitivity, 21.4s TimeCoverageRelationStatistics Valid=881, Invalid=19999, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 18:00:06,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2020-07-20 18:00:06,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2020-07-20 18:00:06,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 431 states. [2020-07-20 18:00:06,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 476 transitions. [2020-07-20 18:00:06,894 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 476 transitions. Word has length 595 [2020-07-20 18:00:06,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:06,895 INFO L479 AbstractCegarLoop]: Abstraction has 431 states and 476 transitions. [2020-07-20 18:00:06,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-20 18:00:06,895 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 476 transitions. [2020-07-20 18:00:06,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 609 [2020-07-20 18:00:06,901 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:06,901 INFO L422 BasicCegarLoop]: trace histogram [92, 91, 91, 46, 46, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:00:07,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:07,115 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:07,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:07,116 INFO L82 PathProgramCache]: Analyzing trace with hash 381814541, now seen corresponding path program 45 times [2020-07-20 18:00:07,116 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:07,116 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475520108] [2020-07-20 18:00:07,117 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:07,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:00:07,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:07,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 18:00:07,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:21,823 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:00:22,990 INFO L134 CoverageAnalysis]: Checked inductivity of 21647 backedges. 182 proven. 5085 refuted. 0 times theorem prover too weak. 16380 trivial. 0 not checked. [2020-07-20 18:00:22,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:23,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:00:25,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475520108] [2020-07-20 18:00:25,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 18:00:25,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97] total 97 [2020-07-20 18:00:25,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337819937] [2020-07-20 18:00:25,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 97 states [2020-07-20 18:00:25,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:25,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2020-07-20 18:00:25,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=474, Invalid=9426, Unknown=0, NotChecked=0, Total=9900 [2020-07-20 18:00:25,805 INFO L87 Difference]: Start difference. First operand 431 states and 476 transitions. Second operand 97 states. [2020-07-20 18:01:23,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:23,047 INFO L93 Difference]: Finished difference Result 443 states and 489 transitions. [2020-07-20 18:01:23,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2020-07-20 18:01:23,053 INFO L78 Accepts]: Start accepts. Automaton has 97 states. Word has length 608 [2020-07-20 18:01:23,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:23,055 INFO L225 Difference]: With dead ends: 443 [2020-07-20 18:01:23,055 INFO L226 Difference]: Without dead ends: 441 [2020-07-20 18:01:23,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 519 SyntacticMatches, 3 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 27.1s TimeCoverageRelationStatistics Valid=900, Invalid=20856, Unknown=0, NotChecked=0, Total=21756 [2020-07-20 18:01:23,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2020-07-20 18:01:23,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 440. [2020-07-20 18:01:23,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 440 states. [2020-07-20 18:01:23,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 486 transitions. [2020-07-20 18:01:23,104 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 486 transitions. Word has length 608 [2020-07-20 18:01:23,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:23,105 INFO L479 AbstractCegarLoop]: Abstraction has 440 states and 486 transitions. [2020-07-20 18:01:23,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 97 states. [2020-07-20 18:01:23,106 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 486 transitions. [2020-07-20 18:01:23,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 622 [2020-07-20 18:01:23,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:23,112 INFO L422 BasicCegarLoop]: trace histogram [94, 93, 93, 47, 47, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:01:23,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:23,325 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:23,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:23,326 INFO L82 PathProgramCache]: Analyzing trace with hash 1724239813, now seen corresponding path program 46 times [2020-07-20 18:01:23,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:23,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765182772] [2020-07-20 18:01:23,327 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:23,628 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:01:23,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:23,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 101 conjunts are in the unsatisfiable core [2020-07-20 18:01:23,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:39,585 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:01:41,041 INFO L134 CoverageAnalysis]: Checked inductivity of 22611 backedges. 186 proven. 5313 refuted. 0 times theorem prover too weak. 17112 trivial. 0 not checked. [2020-07-20 18:01:41,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:01:41,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:01:44,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765182772] [2020-07-20 18:01:44,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 18:01:44,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99] total 99 [2020-07-20 18:01:44,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984093497] [2020-07-20 18:01:44,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-07-20 18:01:44,518 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:01:44,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-07-20 18:01:44,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=484, Invalid=9818, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 18:01:44,520 INFO L87 Difference]: Start difference. First operand 440 states and 486 transitions. Second operand 99 states. [2020-07-20 18:02:46,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:02:46,693 INFO L93 Difference]: Finished difference Result 452 states and 499 transitions. [2020-07-20 18:02:46,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 145 states. [2020-07-20 18:02:46,700 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 621 [2020-07-20 18:02:46,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:02:46,704 INFO L225 Difference]: With dead ends: 452 [2020-07-20 18:02:46,704 INFO L226 Difference]: Without dead ends: 450 [2020-07-20 18:02:46,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 530 SyntacticMatches, 3 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8261 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=919, Invalid=21731, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 18:02:46,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-20 18:02:46,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 449. [2020-07-20 18:02:46,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 449 states. [2020-07-20 18:02:46,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 496 transitions. [2020-07-20 18:02:46,756 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 496 transitions. Word has length 621 [2020-07-20 18:02:46,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:02:46,756 INFO L479 AbstractCegarLoop]: Abstraction has 449 states and 496 transitions. [2020-07-20 18:02:46,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-07-20 18:02:46,757 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 496 transitions. [2020-07-20 18:02:46,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 635 [2020-07-20 18:02:46,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:02:46,761 INFO L422 BasicCegarLoop]: trace histogram [96, 95, 95, 48, 48, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:02:46,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:46,962 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:02:46,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:02:46,963 INFO L82 PathProgramCache]: Analyzing trace with hash 277869069, now seen corresponding path program 47 times [2020-07-20 18:02:46,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:02:46,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002556621] [2020-07-20 18:02:46,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:02:47,254 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:02:47,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:02:47,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 1186 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-20 18:02:47,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:03:06,724 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:03:08,285 INFO L134 CoverageAnalysis]: Checked inductivity of 23596 backedges. 190 proven. 5546 refuted. 0 times theorem prover too weak. 17860 trivial. 0 not checked. [2020-07-20 18:03:08,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:03:09,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:03:11,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1002556621] [2020-07-20 18:03:11,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 18:03:11,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101] total 101 [2020-07-20 18:03:11,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574258722] [2020-07-20 18:03:11,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 18:03:11,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:03:11,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 18:03:11,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=494, Invalid=10218, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 18:03:11,563 INFO L87 Difference]: Start difference. First operand 449 states and 496 transitions. Second operand 101 states. [2020-07-20 18:04:20,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:04:20,811 INFO L93 Difference]: Finished difference Result 461 states and 509 transitions. [2020-07-20 18:04:20,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 148 states. [2020-07-20 18:04:20,818 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 634 [2020-07-20 18:04:20,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:04:20,821 INFO L225 Difference]: With dead ends: 461 [2020-07-20 18:04:20,821 INFO L226 Difference]: Without dead ends: 459 [2020-07-20 18:04:20,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 696 GetRequests, 541 SyntacticMatches, 3 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 34.6s TimeCoverageRelationStatistics Valid=938, Invalid=22624, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 18:04:20,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2020-07-20 18:04:20,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 458. [2020-07-20 18:04:20,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 458 states. [2020-07-20 18:04:20,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 506 transitions. [2020-07-20 18:04:20,857 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 506 transitions. Word has length 634 [2020-07-20 18:04:20,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:04:20,858 INFO L479 AbstractCegarLoop]: Abstraction has 458 states and 506 transitions. [2020-07-20 18:04:20,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 18:04:20,858 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 506 transitions. [2020-07-20 18:04:20,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 648 [2020-07-20 18:04:20,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:04:20,863 INFO L422 BasicCegarLoop]: trace histogram [98, 97, 97, 49, 49, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:04:21,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:21,064 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:04:21,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:04:21,066 INFO L82 PathProgramCache]: Analyzing trace with hash 439207109, now seen corresponding path program 48 times [2020-07-20 18:04:21,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:04:21,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1091431062] [2020-07-20 18:04:21,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:04:21,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:04:21,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:04:21,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 1210 conjuncts, 105 conjunts are in the unsatisfiable core [2020-07-20 18:04:21,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:04:41,948 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 18:04:43,520 INFO L134 CoverageAnalysis]: Checked inductivity of 24602 backedges. 194 proven. 5784 refuted. 0 times theorem prover too weak. 18624 trivial. 0 not checked. [2020-07-20 18:04:43,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:04:44,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:04:47,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1091431062] [2020-07-20 18:04:47,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 18:04:47,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103] total 103 [2020-07-20 18:04:47,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085607872] [2020-07-20 18:04:47,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-20 18:04:47,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:04:47,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-20 18:04:47,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=504, Invalid=10626, Unknown=0, NotChecked=0, Total=11130 [2020-07-20 18:04:47,163 INFO L87 Difference]: Start difference. First operand 458 states and 506 transitions. Second operand 103 states.