/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:15:29,040 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:15:29,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:15:29,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:15:29,055 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:15:29,056 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:15:29,057 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:15:29,059 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:15:29,061 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:15:29,062 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:15:29,063 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:15:29,064 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:15:29,064 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:15:29,066 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:15:29,067 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:15:29,068 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:15:29,069 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:15:29,069 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:15:29,071 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:15:29,073 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:15:29,077 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:15:29,078 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:15:29,079 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:15:29,083 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:15:29,086 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:15:29,103 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:15:29,104 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:15:29,106 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:15:29,107 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:15:29,131 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:15:29,132 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:15:29,134 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:15:29,134 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:15:29,134 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:15:29,135 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:15:29,135 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:15:29,135 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:15:29,135 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:15:29,135 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:15:29,136 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:15:29,137 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:15:29,137 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:15:29,137 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:15:29,138 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:15:29,138 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:15:29,138 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:15:29,138 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:15:29,138 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:15:29,138 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:15:29,139 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:15:29,139 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:15:29,139 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:15:29,140 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:15:29,140 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:15:29,140 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:15:29,140 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:29,140 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:15:29,141 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:15:29,141 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:15:29,477 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:15:29,493 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:15:29,497 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:15:29,498 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:15:29,499 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:15:29,499 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-07-21 19:15:29,576 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/782f5b2a7/24aabb4768b24d83998d1cbd151bb678/FLAG01901a809 [2020-07-21 19:15:30,110 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:15:30,111 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/soft_float_2a.c.cil.c [2020-07-21 19:15:30,123 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/782f5b2a7/24aabb4768b24d83998d1cbd151bb678/FLAG01901a809 [2020-07-21 19:15:30,421 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/782f5b2a7/24aabb4768b24d83998d1cbd151bb678 [2020-07-21 19:15:30,432 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:15:30,436 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:15:30,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:30,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:15:30,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:15:30,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,445 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d7efcc4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30, skipping insertion in model container [2020-07-21 19:15:30,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,453 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:15:30,487 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:15:30,693 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:30,697 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:15:30,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:15:30,855 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:15:30,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30 WrapperNode [2020-07-21 19:15:30,856 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:15:30,856 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:15:30,856 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:15:30,857 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:15:30,871 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,872 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,880 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,898 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,901 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... [2020-07-21 19:15:30,905 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:15:30,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:15:30,905 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:15:30,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:15:30,912 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:15:30,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:15:30,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:15:30,973 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 19:15:30,974 INFO L138 BoogieDeclarations]: Found implementation of procedure base2flt [2020-07-21 19:15:30,974 INFO L138 BoogieDeclarations]: Found implementation of procedure addflt [2020-07-21 19:15:30,974 INFO L138 BoogieDeclarations]: Found implementation of procedure mulflt [2020-07-21 19:15:30,974 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:15:30,974 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure base2flt [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure addflt [2020-07-21 19:15:30,975 INFO L130 BoogieDeclarations]: Found specification of procedure mulflt [2020-07-21 19:15:30,976 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:15:30,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:15:30,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:15:31,407 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:15:31,407 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 19:15:31,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:31 BoogieIcfgContainer [2020-07-21 19:15:31,412 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:15:31,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:15:31,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:15:31,417 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:15:31,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:15:30" (1/3) ... [2020-07-21 19:15:31,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f25230a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:31, skipping insertion in model container [2020-07-21 19:15:31,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:15:30" (2/3) ... [2020-07-21 19:15:31,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f25230a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:15:31, skipping insertion in model container [2020-07-21 19:15:31,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:15:31" (3/3) ... [2020-07-21 19:15:31,421 INFO L109 eAbstractionObserver]: Analyzing ICFG soft_float_2a.c.cil.c [2020-07-21 19:15:31,432 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:15:31,441 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:15:31,456 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:15:31,481 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:15:31,482 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:15:31,482 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:15:31,482 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:15:31,482 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:15:31,483 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:15:31,483 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:15:31,483 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:15:31,502 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states. [2020-07-21 19:15:31,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-21 19:15:31,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:31,511 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:31,512 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:31,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:31,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1570912407, now seen corresponding path program 1 times [2020-07-21 19:15:31,523 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:31,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415811175] [2020-07-21 19:15:31,524 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:31,645 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:31,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:31,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 19:15:31,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:31,759 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 19:15:31,760 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:31,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415811175] [2020-07-21 19:15:31,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:15:31,816 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-07-21 19:15:31,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132811078] [2020-07-21 19:15:31,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:15:31,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:31,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:15:31,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:15:31,844 INFO L87 Difference]: Start difference. First operand 68 states. Second operand 6 states. [2020-07-21 19:15:32,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:32,018 INFO L93 Difference]: Finished difference Result 135 states and 209 transitions. [2020-07-21 19:15:32,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:15:32,023 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 48 [2020-07-21 19:15:32,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:32,043 INFO L225 Difference]: With dead ends: 135 [2020-07-21 19:15:32,044 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:15:32,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:15:32,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:15:32,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2020-07-21 19:15:32,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 19:15:32,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 99 transitions. [2020-07-21 19:15:32,137 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 99 transitions. Word has length 48 [2020-07-21 19:15:32,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:32,138 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 99 transitions. [2020-07-21 19:15:32,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:15:32,139 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 99 transitions. [2020-07-21 19:15:32,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 19:15:32,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:32,144 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:32,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:32,361 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:32,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:32,362 INFO L82 PathProgramCache]: Analyzing trace with hash -243075725, now seen corresponding path program 1 times [2020-07-21 19:15:32,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:32,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2072616058] [2020-07-21 19:15:32,363 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:32,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:32,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:32,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 19:15:32,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:32,498 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:32,498 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:32,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2072616058] [2020-07-21 19:15:32,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:32,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 19:15:32,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063191044] [2020-07-21 19:15:32,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 19:15:32,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:32,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 19:15:32,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 19:15:32,505 INFO L87 Difference]: Start difference. First operand 69 states and 99 transitions. Second operand 4 states. [2020-07-21 19:15:32,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:32,629 INFO L93 Difference]: Finished difference Result 135 states and 194 transitions. [2020-07-21 19:15:32,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:32,631 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 52 [2020-07-21 19:15:32,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:32,634 INFO L225 Difference]: With dead ends: 135 [2020-07-21 19:15:32,634 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:15:32,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:32,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:15:32,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 57. [2020-07-21 19:15:32,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 19:15:32,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 75 transitions. [2020-07-21 19:15:32,662 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 75 transitions. Word has length 52 [2020-07-21 19:15:32,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:32,665 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 75 transitions. [2020-07-21 19:15:32,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 19:15:32,666 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 75 transitions. [2020-07-21 19:15:32,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 19:15:32,670 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:32,673 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:32,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:32,874 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:32,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:32,874 INFO L82 PathProgramCache]: Analyzing trace with hash -1378200528, now seen corresponding path program 1 times [2020-07-21 19:15:32,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:32,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345766907] [2020-07-21 19:15:32,875 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:32,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:32,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:32,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:15:32,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:32,961 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:32,962 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:32,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345766907] [2020-07-21 19:15:32,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:32,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 19:15:32,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997345371] [2020-07-21 19:15:32,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 19:15:32,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:32,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 19:15:32,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 19:15:32,964 INFO L87 Difference]: Start difference. First operand 57 states and 75 transitions. Second operand 4 states. [2020-07-21 19:15:33,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:33,038 INFO L93 Difference]: Finished difference Result 113 states and 152 transitions. [2020-07-21 19:15:33,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 19:15:33,038 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 55 [2020-07-21 19:15:33,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:33,040 INFO L225 Difference]: With dead ends: 113 [2020-07-21 19:15:33,041 INFO L226 Difference]: Without dead ends: 66 [2020-07-21 19:15:33,043 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:33,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-21 19:15:33,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 62. [2020-07-21 19:15:33,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 19:15:33,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 82 transitions. [2020-07-21 19:15:33,054 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 82 transitions. Word has length 55 [2020-07-21 19:15:33,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:33,055 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 82 transitions. [2020-07-21 19:15:33,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 19:15:33,055 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 82 transitions. [2020-07-21 19:15:33,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 19:15:33,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:33,057 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:33,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:33,262 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:33,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:33,264 INFO L82 PathProgramCache]: Analyzing trace with hash 2077112034, now seen corresponding path program 1 times [2020-07-21 19:15:33,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:33,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997910244] [2020-07-21 19:15:33,265 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:33,328 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:33,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:33,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:15:33,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:33,358 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:33,359 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:33,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997910244] [2020-07-21 19:15:33,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:33,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 19:15:33,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946832264] [2020-07-21 19:15:33,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 19:15:33,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:33,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 19:15:33,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 19:15:33,361 INFO L87 Difference]: Start difference. First operand 62 states and 82 transitions. Second operand 4 states. [2020-07-21 19:15:33,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:33,415 INFO L93 Difference]: Finished difference Result 124 states and 168 transitions. [2020-07-21 19:15:33,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 19:15:33,416 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 56 [2020-07-21 19:15:33,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:33,417 INFO L225 Difference]: With dead ends: 124 [2020-07-21 19:15:33,418 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:15:33,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:33,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:15:33,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 65. [2020-07-21 19:15:33,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 19:15:33,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 87 transitions. [2020-07-21 19:15:33,429 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 87 transitions. Word has length 56 [2020-07-21 19:15:33,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:33,429 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 87 transitions. [2020-07-21 19:15:33,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 19:15:33,430 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 87 transitions. [2020-07-21 19:15:33,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 19:15:33,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:33,432 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:33,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:33,646 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:33,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:33,647 INFO L82 PathProgramCache]: Analyzing trace with hash 1438634270, now seen corresponding path program 1 times [2020-07-21 19:15:33,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:33,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912224501] [2020-07-21 19:15:33,648 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:33,710 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:33,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:33,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 19:15:33,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:33,736 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:33,736 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:33,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912224501] [2020-07-21 19:15:33,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:33,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 19:15:33,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979715375] [2020-07-21 19:15:33,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 19:15:33,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:33,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 19:15:33,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 19:15:33,738 INFO L87 Difference]: Start difference. First operand 65 states and 87 transitions. Second operand 4 states. [2020-07-21 19:15:33,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:33,813 INFO L93 Difference]: Finished difference Result 128 states and 173 transitions. [2020-07-21 19:15:33,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:15:33,813 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 56 [2020-07-21 19:15:33,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:33,815 INFO L225 Difference]: With dead ends: 128 [2020-07-21 19:15:33,815 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:15:33,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:33,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:15:33,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2020-07-21 19:15:33,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-21 19:15:33,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 83 transitions. [2020-07-21 19:15:33,826 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 83 transitions. Word has length 56 [2020-07-21 19:15:33,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:33,827 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 83 transitions. [2020-07-21 19:15:33,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 19:15:33,827 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 83 transitions. [2020-07-21 19:15:33,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-07-21 19:15:33,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:33,829 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:34,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:34,043 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:34,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:34,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1416357711, now seen corresponding path program 1 times [2020-07-21 19:15:34,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:34,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [866471030] [2020-07-21 19:15:34,046 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:34,095 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:34,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:34,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:15:34,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:34,155 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:34,156 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:15:34,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [866471030] [2020-07-21 19:15:34,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:15:34,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:15:34,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372741469] [2020-07-21 19:15:34,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:15:34,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:34,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:15:34,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:15:34,167 INFO L87 Difference]: Start difference. First operand 63 states and 83 transitions. Second operand 5 states. [2020-07-21 19:15:34,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:34,313 INFO L93 Difference]: Finished difference Result 133 states and 180 transitions. [2020-07-21 19:15:34,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:15:34,314 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 57 [2020-07-21 19:15:34,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:34,315 INFO L225 Difference]: With dead ends: 133 [2020-07-21 19:15:34,315 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 19:15:34,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:15:34,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 19:15:34,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 64. [2020-07-21 19:15:34,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 19:15:34,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 85 transitions. [2020-07-21 19:15:34,326 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 85 transitions. Word has length 57 [2020-07-21 19:15:34,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:34,326 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 85 transitions. [2020-07-21 19:15:34,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:15:34,326 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 85 transitions. [2020-07-21 19:15:34,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 19:15:34,328 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:34,328 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:34,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:34,543 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:34,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:34,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1229918209, now seen corresponding path program 1 times [2020-07-21 19:15:34,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:34,544 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996753456] [2020-07-21 19:15:34,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:34,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:34,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:34,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:15:34,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:34,616 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:34,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:34,723 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:15:34,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996753456] [2020-07-21 19:15:34,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:34,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 19:15:34,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268786560] [2020-07-21 19:15:34,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:15:34,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:34,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:15:34,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:15:34,728 INFO L87 Difference]: Start difference. First operand 64 states and 85 transitions. Second operand 8 states. [2020-07-21 19:15:34,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:34,816 INFO L93 Difference]: Finished difference Result 147 states and 202 transitions. [2020-07-21 19:15:34,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:15:34,818 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 58 [2020-07-21 19:15:34,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:34,820 INFO L225 Difference]: With dead ends: 147 [2020-07-21 19:15:34,820 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:15:34,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=50, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:15:34,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:15:34,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 72. [2020-07-21 19:15:34,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 19:15:34,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 98 transitions. [2020-07-21 19:15:34,847 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 98 transitions. Word has length 58 [2020-07-21 19:15:34,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:34,848 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 98 transitions. [2020-07-21 19:15:34,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:15:34,848 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 98 transitions. [2020-07-21 19:15:34,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-07-21 19:15:34,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:34,851 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:35,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:35,066 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:35,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:35,067 INFO L82 PathProgramCache]: Analyzing trace with hash -442436896, now seen corresponding path program 1 times [2020-07-21 19:15:35,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:35,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000158824] [2020-07-21 19:15:35,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:35,109 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:35,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:35,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 19:15:35,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:35,170 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:35,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:35,282 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:15:35,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000158824] [2020-07-21 19:15:35,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:35,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2020-07-21 19:15:35,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840730177] [2020-07-21 19:15:35,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:15:35,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:35,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:15:35,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:15:35,285 INFO L87 Difference]: Start difference. First operand 72 states and 98 transitions. Second operand 10 states. [2020-07-21 19:15:41,681 WARN L193 SmtUtils]: Spent 6.26 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 19:15:41,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:41,865 INFO L93 Difference]: Finished difference Result 172 states and 240 transitions. [2020-07-21 19:15:41,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:15:41,871 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 60 [2020-07-21 19:15:41,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:41,872 INFO L225 Difference]: With dead ends: 172 [2020-07-21 19:15:41,872 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 19:15:41,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 113 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=81, Invalid=129, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:15:41,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 19:15:41,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 76. [2020-07-21 19:15:41,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:15:41,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 105 transitions. [2020-07-21 19:15:41,885 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 105 transitions. Word has length 60 [2020-07-21 19:15:41,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:41,885 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 105 transitions. [2020-07-21 19:15:41,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:15:41,886 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 105 transitions. [2020-07-21 19:15:41,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 19:15:41,887 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:41,887 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:42,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,094 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:42,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:42,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1928245008, now seen corresponding path program 2 times [2020-07-21 19:15:42,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:42,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349852723] [2020-07-21 19:15:42,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:42,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:42,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:15:42,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:42,212 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 24 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:42,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:42,374 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 34 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:15:42,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349852723] [2020-07-21 19:15:42,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:42,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 19:15:42,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161992766] [2020-07-21 19:15:42,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:15:42,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:42,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:15:42,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:15:42,377 INFO L87 Difference]: Start difference. First operand 76 states and 105 transitions. Second operand 14 states. [2020-07-21 19:15:42,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:15:42,578 INFO L93 Difference]: Finished difference Result 210 states and 296 transitions. [2020-07-21 19:15:42,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 19:15:42,579 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-07-21 19:15:42,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:15:42,580 INFO L225 Difference]: With dead ends: 210 [2020-07-21 19:15:42,581 INFO L226 Difference]: Without dead ends: 144 [2020-07-21 19:15:42,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=151, Invalid=191, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:15:42,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-21 19:15:42,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 90. [2020-07-21 19:15:42,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 19:15:42,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 128 transitions. [2020-07-21 19:15:42,621 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 128 transitions. Word has length 67 [2020-07-21 19:15:42,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:15:42,623 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 128 transitions. [2020-07-21 19:15:42,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:15:42,623 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 128 transitions. [2020-07-21 19:15:42,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-07-21 19:15:42,624 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:15:42,624 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:15:42,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,826 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:15:42,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:15:42,827 INFO L82 PathProgramCache]: Analyzing trace with hash 1695149600, now seen corresponding path program 2 times [2020-07-21 19:15:42,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:15:42,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563230407] [2020-07-21 19:15:42,828 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:15:42,871 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:15:42,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:15:42,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 19:15:42,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:15:42,955 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 24 proven. 45 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:15:42,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:15:43,301 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 53 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:15:43,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563230407] [2020-07-21 19:15:43,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:15:43,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2020-07-21 19:15:43,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536416705] [2020-07-21 19:15:43,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:15:43,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:15:43,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:15:43,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:15:43,306 INFO L87 Difference]: Start difference. First operand 90 states and 128 transitions. Second operand 18 states. [2020-07-21 19:15:48,183 WARN L193 SmtUtils]: Spent 4.46 s on a formula simplification. DAG size of input: 47 DAG size of output: 17 [2020-07-21 19:15:57,798 WARN L193 SmtUtils]: Spent 6.45 s on a formula simplification. DAG size of input: 41 DAG size of output: 17 [2020-07-21 19:16:06,339 WARN L193 SmtUtils]: Spent 6.28 s on a formula simplification. DAG size of input: 35 DAG size of output: 17 [2020-07-21 19:16:29,330 WARN L193 SmtUtils]: Spent 18.61 s on a formula simplification. DAG size of input: 29 DAG size of output: 23 [2020-07-21 19:16:46,389 WARN L193 SmtUtils]: Spent 4.19 s on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-21 19:16:59,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:16:59,453 INFO L93 Difference]: Finished difference Result 242 states and 348 transitions. [2020-07-21 19:16:59,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 19:16:59,455 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 72 [2020-07-21 19:16:59,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:16:59,457 INFO L225 Difference]: With dead ends: 242 [2020-07-21 19:16:59,457 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 19:16:59,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 68.9s TimeCoverageRelationStatistics Valid=315, Invalid=602, Unknown=13, NotChecked=0, Total=930 [2020-07-21 19:16:59,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 19:16:59,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 100. [2020-07-21 19:16:59,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 19:16:59,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 145 transitions. [2020-07-21 19:16:59,476 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 145 transitions. Word has length 72 [2020-07-21 19:16:59,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:16:59,476 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 145 transitions. [2020-07-21 19:16:59,477 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:16:59,477 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 145 transitions. [2020-07-21 19:16:59,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 19:16:59,479 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:16:59,479 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:16:59,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:59,693 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:16:59,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:16:59,693 INFO L82 PathProgramCache]: Analyzing trace with hash 36384784, now seen corresponding path program 3 times [2020-07-21 19:16:59,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:16:59,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325460947] [2020-07-21 19:16:59,694 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:16:59,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:16:59,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:16:59,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:16:59,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:16:59,972 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 24 proven. 155 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:16:59,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:17:00,511 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 4 proven. 163 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:17:00,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325460947] [2020-07-21 19:17:00,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:17:00,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 19:17:00,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144776237] [2020-07-21 19:17:00,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 19:17:00,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:17:00,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 19:17:00,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:17:00,514 INFO L87 Difference]: Start difference. First operand 100 states and 145 transitions. Second operand 26 states. [2020-07-21 19:17:00,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:17:00,901 INFO L93 Difference]: Finished difference Result 336 states and 484 transitions. [2020-07-21 19:17:00,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 19:17:00,903 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 85 [2020-07-21 19:17:00,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:17:00,906 INFO L225 Difference]: With dead ends: 336 [2020-07-21 19:17:00,906 INFO L226 Difference]: Without dead ends: 246 [2020-07-21 19:17:00,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 155 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=589, Invalid=743, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 19:17:00,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-21 19:17:00,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 126. [2020-07-21 19:17:00,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 19:17:00,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 188 transitions. [2020-07-21 19:17:00,931 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 188 transitions. Word has length 85 [2020-07-21 19:17:00,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:17:00,931 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 188 transitions. [2020-07-21 19:17:00,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 19:17:00,931 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 188 transitions. [2020-07-21 19:17:00,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:17:00,933 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:17:00,933 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:17:01,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:17:01,149 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:17:01,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:17:01,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1334789280, now seen corresponding path program 3 times [2020-07-21 19:17:01,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:17:01,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816328190] [2020-07-21 19:17:01,151 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:17:01,201 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:17:01,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:17:01,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 33 conjunts are in the unsatisfiable core [2020-07-21 19:17:01,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:17:01,490 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 24 proven. 273 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:17:01,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:17:02,494 INFO L134 CoverageAnalysis]: Checked inductivity of 303 backedges. 4 proven. 281 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:17:02,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816328190] [2020-07-21 19:17:02,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:17:02,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2020-07-21 19:17:02,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128153701] [2020-07-21 19:17:02,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 19:17:02,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:17:02,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 19:17:02,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=816, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 19:17:02,498 INFO L87 Difference]: Start difference. First operand 126 states and 188 transitions. Second operand 34 states. [2020-07-21 19:17:12,742 WARN L193 SmtUtils]: Spent 4.33 s on a formula simplification. DAG size of input: 59 DAG size of output: 17 [2020-07-21 19:17:36,966 WARN L193 SmtUtils]: Spent 9.29 s on a formula simplification. DAG size of input: 53 DAG size of output: 17 [2020-07-21 19:18:02,869 WARN L193 SmtUtils]: Spent 15.13 s on a formula simplification. DAG size of input: 47 DAG size of output: 17 [2020-07-21 19:18:38,397 WARN L193 SmtUtils]: Spent 22.80 s on a formula simplification. DAG size of input: 41 DAG size of output: 23 [2020-07-21 19:19:02,131 WARN L193 SmtUtils]: Spent 8.38 s on a formula simplification. DAG size of input: 35 DAG size of output: 17 [2020-07-21 19:19:33,393 WARN L193 SmtUtils]: Spent 14.53 s on a formula simplification. DAG size of input: 29 DAG size of output: 23 [2020-07-21 19:19:52,290 WARN L193 SmtUtils]: Spent 6.24 s on a formula simplification that was a NOOP. DAG size: 23 [2020-07-21 19:20:06,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:06,307 INFO L93 Difference]: Finished difference Result 346 states and 504 transitions. [2020-07-21 19:20:06,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 19:20:06,308 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 96 [2020-07-21 19:20:06,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:06,310 INFO L225 Difference]: With dead ends: 346 [2020-07-21 19:20:06,311 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 19:20:06,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 169.6s TimeCoverageRelationStatistics Valid=918, Invalid=2234, Unknown=40, NotChecked=0, Total=3192 [2020-07-21 19:20:06,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 19:20:06,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 130. [2020-07-21 19:20:06,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-07-21 19:20:06,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 195 transitions. [2020-07-21 19:20:06,327 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 195 transitions. Word has length 96 [2020-07-21 19:20:06,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:06,328 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 195 transitions. [2020-07-21 19:20:06,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 19:20:06,328 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 195 transitions. [2020-07-21 19:20:06,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:20:06,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:06,330 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:06,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:06,543 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:06,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:06,543 INFO L82 PathProgramCache]: Analyzing trace with hash 642274896, now seen corresponding path program 4 times [2020-07-21 19:20:06,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:06,546 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494015330] [2020-07-21 19:20:06,547 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:06,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:20:06,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:06,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 19:20:06,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:07,172 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 24 proven. 737 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:20:07,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:07,385 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 19:20:09,036 INFO L134 CoverageAnalysis]: Checked inductivity of 767 backedges. 4 proven. 745 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:20:09,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494015330] [2020-07-21 19:20:09,037 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:20:09,037 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 19:20:09,037 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329434824] [2020-07-21 19:20:09,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 19:20:09,038 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:09,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 19:20:09,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 19:20:09,040 INFO L87 Difference]: Start difference. First operand 130 states and 195 transitions. Second operand 50 states. [2020-07-21 19:20:10,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:10,389 INFO L93 Difference]: Finished difference Result 570 states and 836 transitions. [2020-07-21 19:20:10,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 19:20:10,390 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 121 [2020-07-21 19:20:10,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:10,394 INFO L225 Difference]: With dead ends: 570 [2020-07-21 19:20:10,394 INFO L226 Difference]: Without dead ends: 450 [2020-07-21 19:20:10,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 215 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2329, Invalid=2927, Unknown=0, NotChecked=0, Total=5256 [2020-07-21 19:20:10,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2020-07-21 19:20:10,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 198. [2020-07-21 19:20:10,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-21 19:20:10,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 308 transitions. [2020-07-21 19:20:10,433 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 308 transitions. Word has length 121 [2020-07-21 19:20:10,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:10,433 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 308 transitions. [2020-07-21 19:20:10,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 19:20:10,434 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 308 transitions. [2020-07-21 19:20:10,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 19:20:10,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:10,436 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:10,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:10,652 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:10,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:10,652 INFO L82 PathProgramCache]: Analyzing trace with hash 574571712, now seen corresponding path program 4 times [2020-07-21 19:20:10,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:10,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2094316513] [2020-07-21 19:20:10,653 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:10,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:20:10,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:10,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:20:10,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:10,845 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 19:20:10,845 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:20:10,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2094316513] [2020-07-21 19:20:10,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:20:10,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:20:10,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965718416] [2020-07-21 19:20:10,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:20:10,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:10,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:20:10,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:20:10,851 INFO L87 Difference]: Start difference. First operand 198 states and 308 transitions. Second operand 6 states. [2020-07-21 19:20:10,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:10,989 INFO L93 Difference]: Finished difference Result 229 states and 349 transitions. [2020-07-21 19:20:10,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:20:10,994 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-07-21 19:20:10,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:10,996 INFO L225 Difference]: With dead ends: 229 [2020-07-21 19:20:10,996 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 19:20:10,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:20:11,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 19:20:11,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 204. [2020-07-21 19:20:11,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 19:20:11,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 316 transitions. [2020-07-21 19:20:11,019 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 316 transitions. Word has length 126 [2020-07-21 19:20:11,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:11,019 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 316 transitions. [2020-07-21 19:20:11,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:20:11,020 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 316 transitions. [2020-07-21 19:20:11,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 19:20:11,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:11,021 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:11,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:11,235 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:11,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:11,236 INFO L82 PathProgramCache]: Analyzing trace with hash -436545538, now seen corresponding path program 1 times [2020-07-21 19:20:11,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:11,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1961398084] [2020-07-21 19:20:11,236 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:11,324 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:11,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:11,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 19:20:11,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:11,353 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 19:20:11,354 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:20:11,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1961398084] [2020-07-21 19:20:11,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:20:11,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 19:20:11,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085655114] [2020-07-21 19:20:11,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 19:20:11,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:11,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 19:20:11,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 19:20:11,363 INFO L87 Difference]: Start difference. First operand 204 states and 316 transitions. Second operand 4 states. [2020-07-21 19:20:11,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:11,400 INFO L93 Difference]: Finished difference Result 214 states and 326 transitions. [2020-07-21 19:20:11,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 19:20:11,401 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 126 [2020-07-21 19:20:11,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:11,403 INFO L225 Difference]: With dead ends: 214 [2020-07-21 19:20:11,403 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 19:20:11,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:20:11,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 19:20:11,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 198. [2020-07-21 19:20:11,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2020-07-21 19:20:11,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 307 transitions. [2020-07-21 19:20:11,422 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 307 transitions. Word has length 126 [2020-07-21 19:20:11,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:11,423 INFO L479 AbstractCegarLoop]: Abstraction has 198 states and 307 transitions. [2020-07-21 19:20:11,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 19:20:11,423 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 307 transitions. [2020-07-21 19:20:11,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 19:20:11,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:11,425 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:11,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:11,640 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:11,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:11,640 INFO L82 PathProgramCache]: Analyzing trace with hash -1419572994, now seen corresponding path program 1 times [2020-07-21 19:20:11,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:11,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869500133] [2020-07-21 19:20:11,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:11,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:11,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:11,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:20:11,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:11,808 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 849 trivial. 0 not checked. [2020-07-21 19:20:11,809 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:20:11,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869500133] [2020-07-21 19:20:11,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:20:11,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-21 19:20:11,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902775640] [2020-07-21 19:20:11,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:20:11,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:11,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:20:11,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:20:11,811 INFO L87 Difference]: Start difference. First operand 198 states and 307 transitions. Second operand 8 states. [2020-07-21 19:20:11,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:11,972 INFO L93 Difference]: Finished difference Result 238 states and 360 transitions. [2020-07-21 19:20:11,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:20:11,973 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 126 [2020-07-21 19:20:11,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:11,975 INFO L225 Difference]: With dead ends: 238 [2020-07-21 19:20:11,975 INFO L226 Difference]: Without dead ends: 228 [2020-07-21 19:20:11,976 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:20:11,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 228 states. [2020-07-21 19:20:11,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 228 to 213. [2020-07-21 19:20:11,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-21 19:20:11,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 327 transitions. [2020-07-21 19:20:11,993 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 327 transitions. Word has length 126 [2020-07-21 19:20:11,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:11,994 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 327 transitions. [2020-07-21 19:20:11,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:20:11,994 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 327 transitions. [2020-07-21 19:20:11,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 19:20:11,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:11,996 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:12,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:12,212 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:12,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:12,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1864277052, now seen corresponding path program 1 times [2020-07-21 19:20:12,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:12,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1494636479] [2020-07-21 19:20:12,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:12,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:12,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:12,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 19:20:12,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:12,333 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 19:20:12,333 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:20:12,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1494636479] [2020-07-21 19:20:12,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:20:12,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:20:12,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653082993] [2020-07-21 19:20:12,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:20:12,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:12,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:20:12,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:20:12,336 INFO L87 Difference]: Start difference. First operand 213 states and 327 transitions. Second operand 6 states. [2020-07-21 19:20:12,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:12,377 INFO L93 Difference]: Finished difference Result 219 states and 332 transitions. [2020-07-21 19:20:12,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:20:12,378 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-07-21 19:20:12,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:12,380 INFO L225 Difference]: With dead ends: 219 [2020-07-21 19:20:12,380 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 19:20:12,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:20:12,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 19:20:12,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 213. [2020-07-21 19:20:12,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 213 states. [2020-07-21 19:20:12,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 326 transitions. [2020-07-21 19:20:12,396 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 326 transitions. Word has length 126 [2020-07-21 19:20:12,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:12,397 INFO L479 AbstractCegarLoop]: Abstraction has 213 states and 326 transitions. [2020-07-21 19:20:12,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:20:12,397 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 326 transitions. [2020-07-21 19:20:12,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-07-21 19:20:12,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:12,399 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:12,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:12,614 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:12,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:12,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1807018750, now seen corresponding path program 1 times [2020-07-21 19:20:12,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:12,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404298320] [2020-07-21 19:20:12,616 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:12,701 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:12,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:12,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 19:20:12,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:12,739 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2020-07-21 19:20:12,740 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:20:12,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404298320] [2020-07-21 19:20:12,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:20:12,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 19:20:12,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761367013] [2020-07-21 19:20:12,741 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 19:20:12,741 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:12,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 19:20:12,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:20:12,742 INFO L87 Difference]: Start difference. First operand 213 states and 326 transitions. Second operand 6 states. [2020-07-21 19:20:12,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:12,797 INFO L93 Difference]: Finished difference Result 226 states and 338 transitions. [2020-07-21 19:20:12,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:20:12,799 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 126 [2020-07-21 19:20:12,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:12,801 INFO L225 Difference]: With dead ends: 226 [2020-07-21 19:20:12,801 INFO L226 Difference]: Without dead ends: 205 [2020-07-21 19:20:12,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-21 19:20:12,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-21 19:20:12,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2020-07-21 19:20:12,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 19:20:12,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 310 transitions. [2020-07-21 19:20:12,834 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 310 transitions. Word has length 126 [2020-07-21 19:20:12,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:12,835 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 310 transitions. [2020-07-21 19:20:12,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 19:20:12,835 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 310 transitions. [2020-07-21 19:20:12,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2020-07-21 19:20:12,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:12,837 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:13,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:13,051 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:13,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:13,051 INFO L82 PathProgramCache]: Analyzing trace with hash 273720313, now seen corresponding path program 1 times [2020-07-21 19:20:13,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:13,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143883307] [2020-07-21 19:20:13,052 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:13,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:13,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:13,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 19:20:13,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:13,221 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-07-21 19:20:13,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:13,538 INFO L134 CoverageAnalysis]: Checked inductivity of 859 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 850 trivial. 0 not checked. [2020-07-21 19:20:13,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143883307] [2020-07-21 19:20:13,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:20:13,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 15 [2020-07-21 19:20:13,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472438591] [2020-07-21 19:20:13,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:20:13,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:13,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:20:13,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:20:13,540 INFO L87 Difference]: Start difference. First operand 204 states and 310 transitions. Second operand 15 states. [2020-07-21 19:20:13,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:13,816 INFO L93 Difference]: Finished difference Result 231 states and 344 transitions. [2020-07-21 19:20:13,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:20:13,823 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 131 [2020-07-21 19:20:13,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:13,825 INFO L225 Difference]: With dead ends: 231 [2020-07-21 19:20:13,825 INFO L226 Difference]: Without dead ends: 211 [2020-07-21 19:20:13,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 246 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:20:13,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2020-07-21 19:20:13,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 201. [2020-07-21 19:20:13,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 19:20:13,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 259 transitions. [2020-07-21 19:20:13,841 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 259 transitions. Word has length 131 [2020-07-21 19:20:13,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:13,842 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 259 transitions. [2020-07-21 19:20:13,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:20:13,842 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 259 transitions. [2020-07-21 19:20:13,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 19:20:13,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:13,844 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:14,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:14,057 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:14,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:14,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1204770984, now seen corresponding path program 2 times [2020-07-21 19:20:14,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:14,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921203694] [2020-07-21 19:20:14,058 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:14,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:14,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:14,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:20:14,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:16,013 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_mulflt_~b_46 Int)) (< (mod |c_mulflt_#in~a| 4294967296) (mod v_mulflt_~b_46 4294967296))) is different from true [2020-07-21 19:20:16,028 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 19:20:16,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:16,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921203694] [2020-07-21 19:20:16,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:20:16,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-21 19:20:16,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618309508] [2020-07-21 19:20:16,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 19:20:16,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:16,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 19:20:16,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=43, Unknown=1, NotChecked=12, Total=72 [2020-07-21 19:20:16,106 INFO L87 Difference]: Start difference. First operand 201 states and 259 transitions. Second operand 8 states. [2020-07-21 19:20:16,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:16,243 INFO L93 Difference]: Finished difference Result 240 states and 308 transitions. [2020-07-21 19:20:16,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:20:16,244 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 135 [2020-07-21 19:20:16,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:16,248 INFO L225 Difference]: With dead ends: 240 [2020-07-21 19:20:16,248 INFO L226 Difference]: Without dead ends: 230 [2020-07-21 19:20:16,249 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=20, Invalid=55, Unknown=1, NotChecked=14, Total=90 [2020-07-21 19:20:16,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2020-07-21 19:20:16,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 216. [2020-07-21 19:20:16,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-21 19:20:16,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 280 transitions. [2020-07-21 19:20:16,276 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 280 transitions. Word has length 135 [2020-07-21 19:20:16,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:16,276 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 280 transitions. [2020-07-21 19:20:16,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 19:20:16,276 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 280 transitions. [2020-07-21 19:20:16,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 19:20:16,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:16,278 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:16,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:16,488 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:16,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:16,488 INFO L82 PathProgramCache]: Analyzing trace with hash -75092694, now seen corresponding path program 1 times [2020-07-21 19:20:16,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:16,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485077345] [2020-07-21 19:20:16,489 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:16,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:16,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:16,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:20:16,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:16,663 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 19:20:16,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:17,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485077345] [2020-07-21 19:20:17,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:20:17,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 19:20:17,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703376004] [2020-07-21 19:20:17,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 19:20:17,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:17,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 19:20:17,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 19:20:17,746 INFO L87 Difference]: Start difference. First operand 216 states and 280 transitions. Second operand 7 states. [2020-07-21 19:20:17,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:17,861 INFO L93 Difference]: Finished difference Result 226 states and 289 transitions. [2020-07-21 19:20:17,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:20:17,862 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 135 [2020-07-21 19:20:17,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:17,864 INFO L225 Difference]: With dead ends: 226 [2020-07-21 19:20:17,864 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 19:20:17,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 149 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:20:17,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 19:20:17,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 19:20:17,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 19:20:17,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 262 transitions. [2020-07-21 19:20:17,879 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 262 transitions. Word has length 135 [2020-07-21 19:20:17,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:17,880 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 262 transitions. [2020-07-21 19:20:17,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 19:20:17,880 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 262 transitions. [2020-07-21 19:20:17,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 19:20:17,882 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:17,882 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:18,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:18,089 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:18,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:18,090 INFO L82 PathProgramCache]: Analyzing trace with hash 681202148, now seen corresponding path program 1 times [2020-07-21 19:20:18,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:18,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401189881] [2020-07-21 19:20:18,090 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:18,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:20:18,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:20:18,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 19:20:18,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:20:18,399 INFO L134 CoverageAnalysis]: Checked inductivity of 864 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 855 trivial. 0 not checked. [2020-07-21 19:20:18,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:20:18,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401189881] [2020-07-21 19:20:18,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 19:20:18,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-07-21 19:20:18,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349516607] [2020-07-21 19:20:18,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:20:18,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:20:18,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:20:18,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:20:18,721 INFO L87 Difference]: Start difference. First operand 204 states and 262 transitions. Second operand 10 states. [2020-07-21 19:20:18,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:20:18,987 INFO L93 Difference]: Finished difference Result 224 states and 285 transitions. [2020-07-21 19:20:18,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:20:18,989 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 135 [2020-07-21 19:20:18,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:20:18,991 INFO L225 Difference]: With dead ends: 224 [2020-07-21 19:20:18,991 INFO L226 Difference]: Without dead ends: 204 [2020-07-21 19:20:18,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 140 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:20:18,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2020-07-21 19:20:19,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 204. [2020-07-21 19:20:19,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 19:20:19,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 261 transitions. [2020-07-21 19:20:19,006 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 261 transitions. Word has length 135 [2020-07-21 19:20:19,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:20:19,006 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 261 transitions. [2020-07-21 19:20:19,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:20:19,007 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 261 transitions. [2020-07-21 19:20:19,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 19:20:19,008 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:20:19,008 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:20:19,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:20:19,212 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:20:19,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:20:19,213 INFO L82 PathProgramCache]: Analyzing trace with hash -598661530, now seen corresponding path program 1 times [2020-07-21 19:20:19,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:20:19,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [235394690] [2020-07-21 19:20:19,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in